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ZXMW NR8961 Description

Product

Digital Microwave Transmission System

ZXMW NR8961 Product Description

ZXMW NR8961 Product Description Version

Date

Author

Reviewer

Notes

© 2018 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE. Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.

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ZXMW NR8961 Product Description

TABLE OF CONTENTS Digital Microwave Transmission System........................................................................... 1 ZXMW NR8961 Product Description................................................................................... 1 1 Overview ............................................................................................................................ 6 1.1 System Introduction ......................................................................................................... 6 1.1.1 OBU......... ..................................................................................................................... 6 1.1.2 ODU.. ............................................................................................................................ 7 1.2 Network Application ......................................................................................................... 7 2 Functions and Features ................................................................................................... 9 2.1 Powerful Hardware Platform ............................................................................................ 9 2.1.1 High Performance Switching Capacity .......................................................................... 9 2.1.2 Ultra High Capacity Transmission ................................................................................. 9 2.1.3 High Reliability Design .................................................................................................. 9 2.2 Enhanced Radio Features ............................................................................................. 10 2.2.1 Flexible Radio Configuration ....................................................................................... 10 2.2.2 Modem Baseband Signal Processing Performance.................................................... 10 2.2.3 Automatic Transmit Power Control (ATPC) ................................................................ 11 2.2.4 Enhanced ACM (Adaptive Coding & Modulation) ....................................................... 11 2.2.5 High Spectrum Efficiency: XPIC & MIMO ................................................................... 12 2.3 Intelligent Service Processing ........................................................................................ 15 2.3.1 Carrier Grade Ethernet Functionality .......................................................................... 15 2.3.2 IP/MPLS/PWE3 Function ............................................................................................ 17 2.3.3 SDN for Deploying an Agile & Flexible Network ......................................................... 19 2.3.4 Physical Layer Aggregation (PLA) .............................................................................. 20 2.3.5 Frame Compression ................................................................................................... 20 2.3.6 QoS......................... .................................................................................................... 21 2.3.7 Link Capacity Pass-Through (LCPT) .......................................................................... 22 2.4 High Accuracy Clock Supply and Synchronization ........................................................ 23 2.5 Network Security ............................................................................................................ 24 2.5.1 Radio Link Security Identification (Link Security ID) ................................................... 24 2.5.2 Access Control List (ACL) ........................................................................................... 24 2.5.3 Broadcast Storm Control ............................................................................................. 24 2.5.4 LMT Authorization ....................................................................................................... 25 2.5.5 Radio Link Encryption ................................................................................................. 25 2.5.6 Other Security Features .............................................................................................. 26 2.6 Management and Maintenance ..................................................................................... 26 2.6.1 Full Scale Management Solution ................................................................................ 26

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ZXMW NR8961 Product Description

2.6.2 Easy Local Management – Wi-Fi Access.................................................................... 27 2.6.3 Intelligent License Control ........................................................................................... 28 2.6.4 OAM .........................................................................................................................29 2.6.5 Ethernet OAM ............................................................................................................. 29 2.6.6 Service Quality Management (SQM) .......................................................................... 32 2.6.7 Frequency Auto-scanning ........................................................................................... 32 3 Hardware Description ..................................................................................................... 33 4 Typical Configurations ................................................................................................... 35 4.1 1+0 Configuration........................................................................................................... 35 4.2 1+1 HSB Configuration Note .............................................................................................. 35 4.3 2+0 XPIC Configuration ................................................................................................. 36 4.4 4+0 XPIC Configuration ................................................................................................. 37 4.5 4x4 MIMO with XPIC Configuration Note ........................................................................... 37 4.6 2+2 XPIC HSB Configuration Note ..................................................................................... 38 5 Performance and Parameters ........................................................................................ 39 5.1 System Integrity ............................................................................................................. 39 5.1.1 Mechanical Characteristics ......................................................................................... 39 5.1.2 Operation Parameters ................................................................................................. 39 5.1.3 Standards Compliance ................................................................................................ 40 5.1.4 Fault Tolerance MTBF/MTTR ..................................................................................... 41 5.1.5 General Safety Requirements ..................................................................................... 41 5.2 Radio Performance ........................................................................................................ 42 5.2.1 Transmitter Characteristics ......................................................................................... 42 5.2.2 Receiver Characteristics ............................................................................................. 48 5.3 System Capability .......................................................................................................... 51 5.3.1 System Transmission Capacity ................................................................................... 51 5.3.2 Frequency Band .......................................................................................................... 54 5.3.3 Channel Spacing ......................................................................................................... 54 6 Abbreviations .................................................................................................................. 55

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ZXMW NR8961 Product Description

1

Overview This chapter gives an overview of the ZXMW NR8961 (NR8961), one of the ZTE’s next generation NR8000 portfolios, an all outdoor split-type digital microwave transmission system.

1.1

System Introduction NR8961 is an IP-based all outdoor microwave radio, which widely used for 3G, 4G LTE and even 5G IP backhaul network with the highlight of zero-footprint. ZXMW NR8961 system includes Outdoor Baseband Unit (OBU) and Outdoor RF Unit (ODU). OBU and ODU work coordinately in various scenarios. Figure 1-1 shows the appearance of NR8961 system. Compare to the traditional split system, all outdoor solution can save site rental fee (OPEX) for operators thus improving total TCO and ROI. The transmission capacity of NR8961 can reach up to 5 Gbps based on the industry leading techniques, such as 112MHz bandwidth [Notes], 4096QAM modulation scheme and MIMO. It also supports builtin Wi-Fi module, IP routing, MPLS and 10GE interface; hardware is prepared for SDN. 

The NR8961 microwave system adopts all outdoor structure, include base band, modem and radio module.It is a waterproof system and can be mounted with antenna in direct-mount way or remote-mount way.

1.1.1

OBU NR8961 OBU provides core control, baseband processing, switching and service access function. As an entire system, it is connected with ODU via an intermediate frequency (IF) cable.

Figure 1-1 NR8961 Appearance (OBU)

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ZXMW NR8961 Product Description

Front

1.1.2

Back

ODU ODU is the outdoor unit of the NR8000 split-type system. It delivers power amplification and radio frequency (RF) conversion functions NR8961 supports one type of ODU- SRU : 

SRU:

operates

in

the

frequency

range

of

6

to

42

GHz

(6/7/8/10/11/13/15/18/23/26/28/32/38/42 GHz), support QPSK to 4096 QAM modulation scheme and 7/14/28/40/56 MHz channel bandwidth [Notes1]. There are three important interfaces on the ODU: 

RF in/out interface (waveguide type) for connecting to antenna.



IF in/out interface (N type) for connecting to modem board.



RSSI (Received Signal Strength Indication) interface (BNC type) for RF receiver signal monitoring.

1.2

Network Application NR8961 is generally used in the entire backhaul network from end to the aggregation sites. The NR8961 provides zero footprint installation solution which reduces the CAPEX and OPEX of outdoor cabinet and indoor equipment room rent. Figure 1-2 NR8961 Application Scenarios

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ZXMW NR8961 Product Description

BSC

Ring

RNC EPC

1 NR8960

NR8960 1

RRU

RRU

1 NR8960 RRU

GE(O/E) Outdoor BBU

Outdoor BBU -48 VDC

1+0

6

Outdoor BBU -48 VDC

2+0 XPIC

Power Cable

-48 VD power Supply

4× 4 MIMO

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ZXMW NR8961 Product Description

2

Functions and Features ZXMW NR8961 inherited most of the features and functions of NR8000 series products. Some salient features are described in this chapter.

2.1

Powerful Hardware Platform

2.1.1

High Performance Switching Capacity NR8961 supports built-in L2 switching functions. The service processing capacity of NR8961 is shown in Table 2-2.

Table 2-1 Switching Capacity Function Name Ethernet Switching

2.1.2

Capacity 52 Gbit/s

Comments Full duplex

Ultra High Capacity Transmission The NR8961 could support up to 2048 QAM modulation scheme with 112 MHz wide bandwidth. The throughput could reach up to 1.26 Gbps per single channel. Combined with XPIC technology, single NR8961 could provide maximal 2.52 Gbps high capacity transmission. Enhanced with advanced MIMO technology, two NR8961s could be configured as 4x4 MIMO configurations, quadruple the capacity with one single frequency pair, supports up to 5 Gbps which is one of the highest in the industry.

2.1.3

High Reliability Design The system design conforms to high standard for the sake of high reliability and availability. 

Ingress protection: IP66,



Lighting protection: 20 KA, lighting arrester saved.

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ZXMW NR8961 Product Description

With the high standard design, NR8961 is able to be applied in various severe environments.

2.2

Enhanced Radio Features

2.2.1

Flexible Radio Configuration The typical radio configuration is shown in Table 2-1.

Table 2-2 Radio Configurations List Item

Configuration Type 1+0

Non-protection

2+0 XPIC

4x4 MIMO with XPIC[Notes2]

1+1 HSB/SD

Hardware Description One OBU, One ODU[Notes1] One OBU, Two ODUs[Notes1] Two OBUs, Four ODUs[Notes1] One OBU, Two ODUs[Notes1]

Protection 2+2 XPIC HSB/SD[Notes2]

Two ODUs

OBUs,

Four

[Notes1]

Notes:

2.2.2

1.

This configuration is going to be supported in next version.

2.

Please refer to chapter 4 configuration and application for detail configuration description.

Modem Baseband Signal Processing Performance 1.

The Adaptive Equalizer, 41-tap fractional-spaced feed-forward filter (FFF), is used to remove inter-symbol interference. This block's adaptation is based on an LMS decision-directed mechanism.

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ZXMW NR8961 Product Description

2.

LDPC (Low-Density Parity-Checked) and RS (Reed-Solomon) codes based FEC (Forward Error Correction) scheme is used to achieve good performance, high reliability and high efficiency.

2.2.3

Automatic Transmit Power Control (ATPC) ATPC (Automatic Transmitter Power Control) is used to lower the RF transmit power when environmental conditions are good in order to reduce wireless interference. Under fading conditions the transmit power is automatically increased to compensate for far end signal loss and to ensure the link continues to meet the required receiver signal level. The response speed of ATPC is 40 dB/s (system) and 90 dB/s (ODU).

2.2.4

Enhanced ACM (Adaptive Coding & Modulation) The NR8961 supports fixed modulation or Adaptive Coding and Modulation (ACM) mode in all frequencies and Channel Spacing (CS). In fixed modulation condition, the radio working status and capacity will not change unless the modulation is changed by manual. Once the signal quality degrading lower than receiver threshold, the link will break down and all the services are affected. ACM enables the radio capacity to change according to the link quality, which is a perfect way to supply additional best effort traffic under normal weather conditions. When extreme weather conditions, such as a storm, affect the transmission and receipt of data and voice over the wireless network, an ACM-enabled radio system automatically changes modulation according to MSE (Mean Square Error, that indicates the signal quality), which allows the high priority data (e.g. real time data) to continue to run uninterrupted. With ZTE’s solution, no bit errors are generated during the modulation change; it is designed for Carrier Grade networks.

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ZXMW NR8961 Product Description

Figure 2-1 ACM Working Scheme (Take QPSK to 4096QAM for Instance)

4096QAM 2048QAM 1024QAM 512QAM 256QAM 128QAM

Low Priority Payload

64QAM 32QAM

16QAM 32QAM

16QAM QPSK

High Priority Payload

ZTE’s enhanced ACM allows the radio maintains the highest level modulation with the lowest transmit power (Tx power). Once fading occurs, NR8961 will increase the Tx power quickly in order to keep the high modulation. Once the Tx power achieves the maximal value of the current modulation, the modulation will degrade to lower level, meanwhile the allowed maximum transmit power will be increased to the maximal Tx power of current low modulation (The lower modulation has

higher max. TX power). When fading

disappears, NR8961 will regain the highest modulation firstly and then decrease the Tx power if the signal quality can meet the requirement of the highest modulation.

2.2.5

High Spectrum Efficiency: XPIC & MIMO Co-Channel Dual Polarization (CCDP) with Cross Polarization Interference Canceller (XPIC) technology is one of the best ways to enhance spectral efficiency. With this function, one frequency source could be used as two carriers to double the throughput. A high performance dual-polarized antenna should be used to minimize the crosspolarization interference.

Figure 2-2 XPIC Description Vertical

Freq 1

660Mbps

Horizontal

660Mbps

½ * Frequency source 2 * Capacity

56MHz@2048QAM

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ZXMW NR8961 Product Description

Common scenarios: 

XPIC function is integrated in NR8961 and 2+0 XPIC configuration can be supported by one NR8961 unit.



XPIC could work alongside with ACM function and 1+1 protection scheme, which can deliver a wireless backhaul solution with enhanced availability, high reliability and high throughput.



PLA or LAG/enhanced LAG is usually used in XPIC radio link to achieve load balance and high throughput

There’s another technique, MIMO (Multiple Input Multiple Output), to further improve the transmission capacity within limited frequency resource besides XPIC. An NxN MIMO system consists of N transmitters and N receivers, N streams of separate signals could be transmitted with one frequency pair simultaneously. The basic principle of MIMO is to transmit a signal with different paths between transmitters and receivers. For example, in a 2x2 MIMO system, there are two possible paths between one transmitter and two receivers. As shown in Figure 2-2, the interfering signal can be cancelled if the difference in propagation between the two paths permits the two received signals to be orthogonal to each other at the receiver modems. For a 2x2 system, this corresponds to a relative phase difference of 90 degrees.

Figure 2-3 2x2 LoS MIMO Basic Principle

Antenna 1 F1

d1

d2

MIMO cable

F1

Antenna 2

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ZXMW NR8961 Product Description

LoS (Line of Sight) MIMO is adopted in microwave radio system. The following advantages could be expected from LoS MIMO: 

Enhance the system throughput – double the throughput within the same frequency pair.

NR8961 supports 4x4 MIMOnote (2x2 MIMO with XPIC, two units are required) configuration. Two NR8961s use the same frequency pair, and each NR8961 (one OBU with two ODU) works as a CCDP pair.

Figure 2-4 NR8961 4x4 LoS MIMO

F1

1 NR8960

d1

d2

MIMO cable

F1 1 NR8960

Antenna 2 Note: 4x4 MIMO with XPIC will be released in next version

2.3

Intelligent Service Processing

2.3.1

Carrier Grade Ethernet Functionality NR8961 provides following Ethernet features.

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ZXMW NR8961 Product Description

Table 2-3 Carrier Grade Ethernet Features Item

Feature E-LINE, E-LAN and E-Access

Description Comply with MEF6.1, MEF10.2, MEF17, MEF22, MEF33;

Standardized

MEF CE2.0 or MEF 9 & MEF14 certificated

Services

IEEE 802.1p/ 802.1q/802.1ad; Bridge

Support peer/tunnel/discard L2 control protocol.

Maximum

MTU: 68 to 9312 bytes configurable;

Transmit Unit

Jumbo frame: up to 9600 bytes. Max number of supported MAC address: 32K.

MAC Address Learning Capacity

MAC address learning enable/disable. MAC address learning mode: IVL/SVL MAC address aging time is configurable: 1 ~ 1048575 s.

Scalability

Comply with IEEE 802.1p/q/ad. Integrated non-blocking switch. 4K*4K VLAN IDs by QinQ. VLAN

Selective QinQ (Add, delete and rewrite VLAN tags based on port /protocol/MAC); Support copy/remap inner VLAN tag priority to outer VLAN.

QoS

Please refer to “chapter 2.3.6 QoS”. Flow control is used for controlling the flow of

Flow Control

data per port (priority blind) according to the radio capacity when congestion occurred, comply with IEEE 802.3 x.

Quality of

The PIS technology is going to classify the

Service

services into 2 ranks. The one with lower Packet Intelligent Segment (PIS)

priority will be cut into fragments while the other high priority services will be transmitted directly. With PIS function, long time delay and jitter of high priority services could be avoided. Physical layer aggregation (PLA) is specially

Reliability

PLA

used for air interface aggregation and load balance;

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ZXMW NR8961 Product Description

Item

Feature

Description PLA can divide the services into several channels but need no protocols, it is better than LACP under unbalanced streams. 802.3ad/802.1ax ; Widely used for Ethernet port protection and air interface load balance; Static (with LACP) and manual (without LACP) aggregation;

Enhanced LAG

Load balance is realized by XOR and hash

(LACP)

algorithm: LAG - based on MAC address, IP address (IPv4/IPv6); Enhanced LAG - based on MAC address, IP address (IPv4/IPv6), MAC/MPLS/IP V4/IP V6 packet identification. ITU G.8032v1 Ethernet single ring protection

ERPS

switching; ITU G.8032v2 Ethernet multiple ring protection switching. STP comply with IEEE 802.3d;

STP/RSTP/MSTP

RSTP comply with IEEE 802.3W. MSTP comply with IEEE 802.1s. Port blocking feature is possible to prevent forwarding of frames from a given ingress port

Port Blocking

to one or more egress ports. With port blocking, flows of leaves can be isolated to each other in a tree topology.

ETH OAM

IEEE 802.3ah EFM; IEEE 802.1ag CFM, ITU-T Y.1731ETH OAM. RFC 2819 - Remote network monitoring

Service

management information base.

Management RMON v1/v2

RFC 4502 - Remote Network Monitoring Management Information Base Version 2 using SMIv2

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ZXMW NR8961 Product Description

2.3.2

IP/MPLS/PWE3 Function Function

Description 

Supports the following L3 interface 

L3 interface based on the VLAN



VLAN sub-interface based on the interface and VLAN



Basic Functions



Supports the ARP protocol 

Dynamic ARP requests.



ARP response.



Dynamic ARP aging and aging time configuration.



Static ARP configuration

Supports IPv4 unicast route forwarding 

IPv4 unicast route linear forwarding.



Best match of the hardware route table.



Static routes.



ICMP protocol.



TCP/UDP protocol.



FRR protection: IP FRR, LDP FRR, PW FRR, BGP

VPN FRR 

BFD for OSPF/IS-IS.



LDP (Label Distribution Protocol).



Static routing.



OSPF (Open Shortest Path First) protocol V2 (RFC 2328).

Routing Protocols

PWE3



IS-IS protocol (RFC 1195).



RIP (Routing Information Protocol) v1/v2.



Border Gateway Protocol (BGP) (RFC4271).



Setup mode: Static PW, LDP PWs.



Tagged mode and raw mode ETH PWE3 (RFC 4448) base MPLS L2VPN.



E1 PWE3 (RFC 4553 SAToP /RFC 5086 CESoPSN /ITU-Y.1413) - base MPLS L2 VPN.

Enhanced Features



Synchronization: ACR, DCR



VRRP (Virtual Router Redundancy Protocol)



VPLS (Virtual Private LAN Service) (RFC 4761/RFC 4762)

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ZXMW NR8961 Product Description

Function

Description 

H-VPLS (Hierarchy of VPLS)



BGP/MPLS L3VPN (L3 Virtual Private Networks).



BGP/MPLS HoL3VPN (Hierarchy of L3 VPN)



LSP ping and LSP traceroute (RFC6424).



MPLS-TP: QoS, PWE3



IGMP Snooping, IGMPv2 (RFC 2236) and IGMPv3 (RFC 3376) (on roadmap)

2.3.3



MPLS Tunnel APS/PW APS (on roadmap)



MPLS-TP OAM (G-ACH+Y.1731) (on roadmap)



OSPF protocol V3 (RFC 5340) (on roadmap)



IP multicast routing (on roadmap)



PIM (Protocol Independent Multicast) (on roadmap)



MLD (Multicast Listener Discovery Protocol) (on roadmap)

SDN for Deploying an Agile & Flexible Network Software-Defined Networking (SDN) is an emerging architecture that is dynamic, manageable, cost-effective, and adaptable, making it ideal for the high-bandwidth, dynamic nature of today’s applications, which offers a centralized, programmable network to enable cloud and network engineers and administrators to respond quickly to changing business requirements.

Figure 2-5 SDN framework

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ZXMW NR8961 Product Description

ZTE will provide an open source OpenDaylight (ODL) based microwave controller- Zenic MW Controller. It also can support in-built ODL/ONOS applications. This controller is designed on the same platform with ZTE Zenic WAN controller used for carrier networks and supports the open NBI (Northbound Interface) and SBI (Southbound Interface) to enrich business applications and network services. Three basic SDN features - topology auto-discovery, E2E L2 ETH service instantiation and RF parameter configuration have been test for some famous telecom operators. 1.

Topology Auto-discovery: ZTE’s Zenic MW controller can collect, manage and apply the network topologies (physical topology and service topology) it manages, and display them as required by the user via Netconfig. For instance, when a node or link fails, the topology view can display the change of physical topology and can also color the faulty link or node.

2.

E2E ETH Instantiation: The end-to-end L2 service can be established by the Zenic MW controller, including E-LINE and E-LAN, which conforms to the MEF standard.

3.

RF Parameter Configuration: Through the ONF TR532 south of the interface, the Zenic MW controller can configure the microwave radio port parameter, such as frequency, bandwidth and modulation. During the network running, the controller can also query microwave radio parameter configuration through TR532 interface. Operators also can develop other automation APPs basing on TR532.

2.3.4

Physical Layer Aggregation (PLA) The NR8961 supports Ethernet traffic load balance by Physical Layer Aggregation (PLA) for the internal two radio channels. PLA can send one Ethernet stream to far end through two radio channels, which is very useful for delivering large data streams. It’s an intelligent way of increasing bandwidth utilization by adjusting the two inside radio channels’ throughputs dynamically according to their forwarding efficiency. Function highlights: 

Realize high throughput transmission with low capacity radio



Provide carrier grade network within 50 ms switching time for Ethernet service

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ZXMW NR8961 Product Description

2.3.5

Frame Compression In order to improve the transmission efficiency and the throughput under the limited radio source, an encapsulation efficiency technology called Frame Header Compression is adopted by NR8961. ZTE industry leading Header Compression technology increases the effective capacity over the radio link. It supports compression of Layer 2 (MAC address/VLAN tag), Layer 2.5 (MPLS labels) and Layer 3-4 (IPv4/IPv6 address/UDP) header fields. Header Compression is accomplished by identifying packets with a recurring pattern of their header fields. Such fields with recurring values are omitted and replaced with a much shorter compression tag. Original headers are stored in Compression Table together with their compression tag on both sides of the link. A handshake mechanism between the transmitter and the receiver ensures that the Compression tables are synchronized on both sides of the link. With the Header Compression, Ethernet throughput could be enhanced by 3% to 220%. Notes: The actual increased throughput depends on the packet size and compression scheme.

2.3.6

QoS The Quality of Service (QoS) indicates the performance of data stream over a network. It promises to provide end-to-end services of high quality for users by resolving network delay and congestion problems. In case of network overload or congestion, QoS ensures high priority traffics. The following features are supported:

Table 2-4 QoS Features Feature

Description Flow classification based on: ingress port, IPv4 ToS/DSCP, IPv6 TC, 802.1p CoS, 802.1p C-VLAN Pbit/S-VLAN Pbit,

Flow Classification

802.1q C-VLAN ID/S-VLAN ID, TCP/UDP source/destination port number, source/destination MAC address, source/destination IP address, Ethernet type and MPLS TC (EXP).

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ZXMW NR8961 Product Description

Feature

Description Mark DSCP (according to ACL classification) / Outer VLAN tag priority (according to queue mapping) CAR supports: single-rate three-color marker (RFC2697) and

Ingress Policy

two-rate three-color marker (RFC2698), both of them can work at color-blind and color-aware mode. CIR, PIR, CBS and PBS with Nx64kbit/s step size. 8 CoS (class of service) via 8 priority queues: BE, AF1, AF2,

Queue Schedule

AF3, AF4, EF, CS6, and CS7. Schedule scheme: SP, WRR, DWRR, WFQ, SP+WRR, SP+DWRR. SP+WFQ.

Egress Shaping

Queue or egress port based shaping at Nx64Kbit/s step size.

Congestion

Tail drop, RED (Random Early Detection) and WRED

Management

(Weighted Random Early Detection). Priority sequence:

The priorities of CES E1s or VC-12s of ch.STM-1 are Priorities of Different

assigned by the Ethernet priorities codes of the emulated

Services

TDM service. Priority mapping: The system supports the mapping of 802.1p VLAN Pbit/VLAN ID/IP DSCP values to MPLS EXP values HQoS is dedicated to offer user level services of sophistication. It supports four layers of scheduling with 1K queues, including business layer, user layer, user group layer

HQoS

and port layer, and it also supports export speed limit for each layer. Through different layers of scheduling mechanism, HQoS can realize delicacy service quality control.

2.3.7

Link Capacity Pass-Through (LCPT) When microwave transmission capacity changes (such as ACM regulation or PLA/LAG switchover trigger capacity changes), traditional microwave will handle transmission services based on its own configuration, usually some low-priority services will be discarded. However NR8000 provide LCPT function, which Improve bandwidth utilization and network availability.

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ZXMW NR8961 Product Description

LCPT is a new E2E technique, which can be used for ZTE microwave and wireless network interaction. NR8000 equipments will send LCPT messages (802.3ah OAM message) to downstream base stations when microwave radio capacity changes. Then the base station controller will send orders to the affected base stations to adjust the traffic rate. ZTE unique LCPT function enables the base station to sense the microwave radio capacity change timely: 

Microwave radio capacity reduction: the BSC will schedule the services flexibly and the downstream base station will reduce access services accordingly;



Microwave radio capacity Increase: the downstream base station will be synchronized to improve access services based on users’ requirements.

Therefore, the services will be adjusted actively by the base station instead of being discarded by the microwave equipment passively. Figure 2-6 LCPT Working Scheme (MW Radio Works with 2G/3G RAN)

1

MW link capacity changes

Microwave

2

3

Send LCPT message

Receive & reported LCPT message BS Controller

Base Station 4

Notice the effected BS to adjust the service access rate

TIPS: LCPT function is available for L2 ETH switching network. Please refer to “LCPT technical white paper” for more information.

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ZXMW NR8961 Product Description

2.4

High Accuracy Clock Supply and Synchronization NR8961 supports diversified clock in/out options and provides the mainstream synchronization methods. The microwave system could synchronize from radio frame and the external clock input. NR8961 could also distribute clock signal to other equipments (base station for instance). The main features include: 

The clock accuracy complies with the ITU-T G.813, ITU-T G.823, ITU-T G.8260, ITUT G.8261, ITU-T G.8262, ITU-T G.8263, ITU-T G.8264, ITU-T G.8265, IEEE 1588v2, ITU-TG.8271, ITU-TG.8271.1, ITU-TG.8272, ITU-TG.8273, ITU-TG.8273.2, ITUTG.8275 and ITU-TG.8275.1 standards, supporting three working modes: locking, maintaining, and free oscillation. .



Sync. E with SSM/expanded SSM protocol.



Supports priority-based multi clock source protection and 1588v2 BMC algotithm.



Network synchronization methods: Frequency synchronization (Sync. E, 1588v2 TC,); Phase synchronization (1588v2 TC, Sync. E + 1588v2 OC/BC).



2.5

Clock holdover time is 24 hours at least

Network Security NR8961 can prevent unauthorized logins and operations, ensuring network, radio link and equipment management security.

2.5.1

Radio Link Security Identification (Link Security ID) Link Security Identification (link security ID) is used to avoid mismatch between two radio links. Two ends of a radio link with different radio link IDs will not communicate each other even if they have other proper configurations. It’s a good way of preventing undesired link connection to improve network security, such as the third party malicious data interception.

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ZXMW NR8961 Product Description

Alarms will be reported and the traffic will be interrupted once link ID differences between local and remote sites are detected.

2.5.2

Access Control List (ACL) Access Control List (ACL) can classify the ingress packets and implements black list management to enhance the network security. Black list can be created via setting ACL parameters to specify which kind of traffic will be rejected per port. When a black list is enabled, the frames in the black list will be discarded.

2.5.3

Broadcast Storm Control Filters can be created per port to prevent broadcast and multicast storms. Individual filters are used for broadcast and multicast traffic. The limit is specified as fixed rate (frames per second). When the limit is reached, additional frames will be discarded until the frame rate is below the specified threshold. NR8961 supports limiting maximum ingress rate for broadcast, multicast and unknown unicast packets to prevent disruption of normal traffic flow. Maximum ingress rate shall be configurable on per port basis. The adjustment range is N×64 Kbps – 1 Gbps. The adjustment step is N×64 Kbps. Maximum rate shall be configurable separately for the following packet categories: 

Broadcast packets



Unknown unicast packets



Known multicast packets



Unknown multicast packets

Note: Unknown unicast packets are packets, which destination MAC address is not stored in the MAC address table. Unknown multicast packets are packets, which multicast destination address is not registered in the L2MC table.

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2.5.4

LMT Authorization LMT (Local Maintenance Terminal) authority is graded to 3 levels: 1.

Administrator

2.

Operator

3.

Browse User

Administrator has the highest authority and browse user is the lowest. The OMC could set different authorization for each kind user to ensure the management security. NR8961 will record and send the log and configure action to the EMS server.

2.5.5

Radio Link Encryption Radio link encryption function using AES algorithm to encrypt radio data, thus preventing the third parties unauthorized access to microwave transmission network. This function can effectively prevent transmit data to be illegally obtain or modify. Encryption algorithms include:

2.5.6



Symmetric key algorithms: 128-bit AES



Symmetric key algorithms: 256-bit AES

Other Security Features More security features are supported shown as following: 

Secure communication channels: MD5, SNMP V2/V3, SSH, HTTPS and SFTP.



LMT account locking.



User account. Disable/enable



RADIUS (Remote Authentication Dial-In User Service) authentication (RADIUS server is required).

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

TACACS+ (Terminal Access Controller Access Control System) (will be released in Q2 2018).



802.1x port-based authentication (will be released in Q2 2018).

2.6

Management and Maintenance

2.6.1

Full Scale Management Solution ZTE offers powerful management system of NE (Networks element) level and Network level. The following features are used in network management:

Table 2-5 Network Management Features Feature

Description

Benefits

Any GbE interface can be used for local management. Out-band management: Any Management (DCN) Data Communication Network)

GbE interface can be used as a separated DCN port. In-band management: DCN and traffic can be transferred through the same GbE interface

64 Kbps to 5 Mbps configurable DCN bandwidth fits for different network size. Management and traffic share the radio link bandwidth.

but solated by VLAN tag (VLAN ID)/VPN. NE and Link Autodiscovery (LLDP)- Link Layer Discovery Protocol

Route Management

The EMS can create and change the equipments’ view

Network construction and

object and network topology

management becomes

automatically via the mutual

intelligent and easily.

information. Static route configuration and

Improve the flexibility of

OSPFv2 based automatic route

network deployment and

management.

reduce the TCO. Monitoring the system

System Log

System log reporting feature

performance and locating the fault.

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

Web-based local terminal management offers a convenient and simply configuration method. It's an indispensable part when lack of EMS/NMS.



NetNumen™ U31, ZTE’s network management solution, provides simplified network provisioning, configuration error prevention, monitoring and troubleshooting tools that ensure better user experience, minimal network downtime and reduced expenditures on network level maintenance.

2.6.2

Easy Local Management – Wi-Fi Access The NR8961 is an all outdoor architecture product, which is always installed on the tower or rooftop. To improve the operation experience especially for maintenance work, the NR8961 provides a Wi-Fi access management. With the ZTE app, the maintenance engineer could check product status with a handheld terminal (such as smart phone, pad) without climbing the tower. Wi-Fi access management is an optimal solution for all outdoor architecture products.

Figure 2-7 Wi-Fi Access for Easy Commissioning and Maintenance

Integrated Wi-Fi module

Benefits of Wi-Fi access: 

Operating via smart terminal and not just via PC, easy access

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ZXMW NR8961 Product Description

2.6.3



Wi-Fi access, no need climbing the tower, saving 100 USD each time



Operation on the ground, safety for the engineers



Smart terminal APP, realize one key commissioning, high accuracy & efficiency



Wi-Fi can be encrypted/disabled/hided, ensure operation security.

Intelligent License Control All the functions of NR8000 are prepared once the hardware is deployed, while some functions are controlled by software license. This kind of design enables a step-by-step and low risk investment. Thus, capital shortage and over investing is avoided. In order to manage the license, standing on customer site, ZTE creates an industrial leading intelligent license management system, which is a kind of centralized and flexible license control solution with 3 typical features: 

Centralized license pool (License center).



Bulk import license.



Transferable license.

Figure 2-8 Intelligent License Control Schematic Plot

License file can be bulk imported to the license center (separated server or share EMS server) and act as license pool. After that, the on-line network elements (NEs) will request license from license pool (or release license to license pool) automatically according to link requirement. Manual setting is also supported.

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Intelligent license control brings: 

Importing the license in bulk, save time.



License can be enabled automatically, easy maintenance.



License reusing, reduce CAPEX.



License transfer, easy site relocation.



Function adjustment, optimize network performance.

2.6.4

OAM

2.6.5

Ethernet OAM IEEE 802.3ah complied Ethernet link OAM, IEEE 802.1ag and ITU-T Y.1731 complied Ethernet service OAM is supported by NR8961, which provide E2E and hierarchical Ethernet OAM for our customer’s network.

2.6.5.1

Ethernet Link OAM Ethernet Link OAM supports fault management on Ethernet links according to IEEE 802.3ah (also called “EFM”) and provides fault management and performance monitoring in the Metro Ethernet Network (MEN) access link. It is used in physical line connection scenario. Notes: Ethernet Link OAM is only supported for LAN interfaces.

The three main Ethernet Link OAM areas are supported: 1.

Link Performance Monitoring.

Link performance monitoring is used for event notification on error frames at both near and far end and is used on NEs in operation. The notifications are based on a threshold crossing within a specific time window. 2.

Failure Notification

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ZXMW NR8961 Product Description

Notices the Ethernet link failure to the far end that in OAM operation. 3.

Remote Loopback

Link OAM remote loopback can be used for fault localization and link performance testing on LAN interfaces.

2.6.5.2

Ethernet Service OAM IEEE 802.1ag (also called “CFM") is a standard defined by IEEE. It defines protocols and practices for OAM (Operations, Administration, and Maintenance) for paths through 802.1 bridges and local area networks (LANs). IEEE 802.1ag is largely identical with ITU-T Recommendation Y.1731, which additionally addresses performance management. The main Ethernet service OAM areas are described below.

Table 2-6 Ethernet Service OAM Function

Description

Standard

Continuity check (CC) in MEN is used for the Ethernet fault CC

checking, which indicates the link status between two MEPs. CC period: 3.33 ms, 10 ms, 100 ms,1 s, 10 s, 1 min, 10 min. Loopback (LB) is used for fault confirmation and fault

LB

location. The loopback defined in IEEE 802.1ag is a kind of

802.1ag

unicast loopback that brings no user service interruption Link Trace (LT) is used for fault location and route LT

discovery. When this function is enabled, the service route and failure point of the demand link is list Frame Loss Measurement (LM) is used to measure

LM

Ethernet end-to-end frame lost ratio, which is lunched by the network manager. Both single side and double side LM is supported.

DM

28

Y.1731

Frame Delay Measurement (DM) is used for on-demand OAM to measure Ethernet end-to-end frame delay and

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Function

Description

Standard

frame delay variation. Both one-way and two-way DM is supported RDI

Remote Defect Indication (RDI) informs the remote MEP there is a fault occurred at local MEP. Alarm Indication Signal (AIS) suppresses alarms at the

AIS

client-layer MEPs after detecting a fault or an AIS condition at the server-layer MEP. Locked Signal (LCK) suppresses the alarms generated by

LCK

out-of-service management or testing. The MEPs which received LCK information will ignore the link failure caused by the testing Testing signal (TST) is used for Ethernet throughput and

TST

packet loss rate testing, including in-service or out-ofservice testing.

R-APS

2.6.6

Ring-Automatic Protection Switching (R-APS) provides switching signal for G.8032 ring protection.

Service Quality Management (SQM) 

Y.1564/RFC2544 built-in device can be applied for performance test of service channel at reference link design in system acceptance test after link commissioning. The test mainly includes throughput, frame loss, latency and packet jitter.



Built-in TWAMP (RFC 5357 - A Two Way Active Measurement Protocol) can be used for online IP performance measurement during network stability period. The test mainly includes Lost Packets, Latency/Delay and Packet Delay Variation. With TWAMP available, network providers will be able to better know the exact behavior of their networks and apply resources where improvement is most likely.

2.6.7

Frequency Auto-scanning Frequency scanning is a detection technique to help us to find out the interference by scanning receiver radio signal within frequency sub-band, and found a high quality microwave transmission link. The higher the receiver signal level is, the severer the interference will be.

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ZXMW NR8961 Product Description

One can benefit from three aspects as follows: 

During site building, we can confirm whether there is adjacent station or overreach station interference in short time.



If the decline of transmission quality caused by poor signals during operation, maintenance staff can detect the interference frequency source accurately and avoid interference by rearranging the frequency plan.



This function is realized by microwave equipment without any expensive frequency scanning instrument such as spectrum analyzer to save the operating cost.

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3

Hardware Description The ZXMW NR8961 microwave system adopts compact architecture. All functionalities are integrated in only one all outdoor unit including RF module and Baseband switch. The NR8961 provides plenty interfaces for service access in different application scenarios.

Figure 3-1 NR8961 OBU Interface

IF1

WiFi

IF2

MO

MI

COMBO XGE2

XGE1

GE3

GE4

PWR

GE5&POE

Table 3-1 Interface Description Interface IF1/IF2

Type

Description

Female TNC

IF signal input /output interface for channel 1

connector

and channel 2.

Wi-Fi

N/A

MI/MO

QMA

Integrated Wi-Fi Antenna, supporting wireless access configuration and management MIMO signal input and output interface The port could be be configured as10 Gigabit

COMBO

SFP

Ethernet port (optical) or extension functon port , such as PLA, protection, MIMO Sychronizaiton+PLA, local management.

XGE1/XGE2

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SFP

The port could be be configured as Gigabit/10 Gigabit Ethernet port (optical)

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ZXMW NR8961 Product Description

Interface

Type

GE3

SFP

GE4/GE5&POE

RJ45

PWR

2 pin connector

Description The port could be be configured as Gigabit Ethernet port (optical) 1000 BaseT electrical interface (support PoE input[Note]). -48 V DC supply for non-PoE scenario.

Note：PoE input is supported in 1+0 configuration currently.

Table 3-2 Physical Interface Parameters Interface

Capacity/Signal

Interface Type

Name

Rate

& Standards

GE (electrical)

GE (optical)

1000 Mbps

1000 Mbps

Impedance and Others

RJ-45

TIA/EIA-568-B.1-2001

10/100/1000 BaseT

Rate: 10/100/1000 Mbps

IEEE802.3ab

self adaptive.

RFC894

Supports MDI/MDI-X.

SFP LC

Wave length:

1000 Base-LX

1310/1550nm (single mode

1000 Base-SX

fiber)

IEEE802.3z

850nm (multi-mode fiber)

RFC894

Rate: 1000 Mbps Wave length:

SFP+, LC XGE (optical)

10 Gbps

10GBase-LR/ER SFF-8431, SFF-8432

850/1310/1550 nm (single mode). Rate: 10 Gbps. Frame format: Ethernet V2 (RFC894) and IEEE 802.3

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4

Typical Configurations NR8961 supports flexible configurations, such as 1+0 non-protection, 1+1 HSB/SD, 2+0 XPIC, 4+0 XPIC and 4x4 MIMO with PLANote.

4.1

1+0 Configuration 1+0 configuration is designed for tail transmission with low cost and easy connection. Figure 4-1 1+0 Configuration Diagram OBU-ODU Remote Mount

ETH Cable

NR8961 OBU

ODU

IF Cable

4.2

1+1 HSB Configuration

Note

1+1 HSB is 1+1 hardware hot standby protection. In 1+1 HSB configuration, one OBU and two ODUs are required. The two channels of the OBU provide hardware failure protection for each other. The main ODU and standby ODU are installed on the same antenna to provide hardware level protection. Figure 4-2 1+1 HSB Configuration Diagram OBU-ODU Remote Mount

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ZXMW NR8961 Product Description

NR8961-ODU Remote Mount ODU-Antenna Direct Mount ODU Coupler

NR8961 OBU

ODU

IF Cable

ETH Cable Note: 1+1 HSB will be released in next version.

4.3

2+0 XPIC Configuration NR8961 supports 2+0 XPIC configuration. NR8961’s two RF channels work at V and H polarization of same frequency pair. Two ODUs direct mount to the antenna through a special designed OMT. NR8961 should support internal cable lining for XPIC cancellation of two RF channels.

Figure 4-3 2+0 XPIC Configuration Diagram OBU-ODU Remote Mount

ODU

OMT

NR8961 OBU

ODU

IF Cable

ETH Cable

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4.4

4+0 XPIC Configuration NR8961 supports 4+0 XPIC （PLA） configuration with two OBUs and four ODUs, which can be applied in high capacity link (aggregation link). The two ODUs of each NR8961 with the same polarization are installed to one coupler, and use the flexible waveguide to connect the dual polarization antenna.

Figure 4-4 4+0 XPIC Configuration Diagram OBU-ODU Remote Mount F1 V

ODU Coupler

NR8961 OBU NR8961 OBU

F2 V

F2 H

ODU

V

ODU

H

Coupler ETH Cable

4.5

F1 H

Flexible Waveguide

ODU

IF Cable

4x4 MIMO with XPIC Configuration

Combo: 4+0 PLA

Note

Combining the XPIC and MIMO technology, NR8961 can quadruple the link capacity with the only one frequency pair, which is called 4x4 MIMO. In 4x4 MIMO configurations, two NR8961 use the same frequency pair, and each NR8961 works as a CCDP pair. Each NR8961 is directly mounted to one antenna through a special designed OMT for spatial diversity. For service access, Two NR8961 could connect to the other product through Y optical cable. When one unit fails, the other one could change the working status and access the traffic through Y

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ZXMW NR8961 Product Description

optical cable directly. In this way, we can keep half of the transmission capacity once failure occurs.

Figure 4-5 4x4 MIMO with XPIC Configuration Diagram OBU-ODU Split Mount F1 V

ODU

OMT NR8961 OBU NR8961 OBU

F1 H F1 V

ODU

ODU OMT

ETH Cable

F1 H

ODU

IF Cable

MIMO/MRC: MIMO COMBO: MIMO SYNC+PLA

Note: 4x4 MIMO with XPIC will be released in next version.

4.6

2+2 XPIC HSB Configuration

Note

NR8961 supports 2+2 XPIC HSB (PLA) configuration, which can be applied in long distance and high capacity link (aggregation link). Each NR8961 system works as one group of XPIC pair, and two NR8961 OBUs provide hardware failure protection for each other. Two ODUs with the same polarization are installed to one coupler, and use the flexible waveguide to connect the dual polarization antenna. Two NR8961s will connect to the other equipment by Y Optical Cable. Figure 4-6 2+2 XPIC HSB Configuration Diagram OBU-ODU Split Mount

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F1 V

ODU

Coupler NR8961 OBU

ODU

V

ODU

H

F1 V

NR8961 OBU

F1 H

Flexible Waveguide

Coupler

IF Cable Y Optical Cable

F1 H

ODU

NMS connection

Note: 2+2 XPIC HSB will be released in next version.

5

Performance and Parameters The main functions, features and applications have been introduced in the above chapters, and now their detail parameters will be stated in this part.

5.1

System Integrity These parameters are the basic physical information of the NR8961.

5.1.1

Mechanical Characteristics Table 5-1 shows the dimensions and weights of NR8961

Table 5-1 Dimension and Weight Item OBU

5.1.2

Dimension (mm) 260 (W) × 278 (H) × 77 (D)

Weight (±0.5 kg) 4.5 (Fully equipped)

Operation Parameters The operation parameters include power supply, temperature, humidity and typical power consumption.

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Table 5-2 Power supply Input Voltage

Description

-48 V DC (-40.5 V ~ 57.6 V)

Supply power for IDU & ODU

220 V AC (100 ~ 220 V AC)*

Table 5-3 Temperature, Humidity and Power consumption

Item Operating temperature Transportation/Storage Temperature Humidity

OBU

ODU

-40°C ~ 55°C

-40°C ~ 55°C

-40°C ~ 70°C

-40°C ~ 70°C

5% ~ 100%

5% ~ 100%

25 W (32/38/42 GHz) Typical Power consumption

38.5 W

27 W (6/7/8/10/11/13/15/23/26 GHz) 29 W (18/28 GHz)

Notes: * AC power input is supported with additional DC/AC adapter

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5.1.3

Standards Compliance Table 5-4 Complied Standards Specifications

Standards EN 301 489-1 IEC 610000-4-2 IEC 610000-4-3

EMC

IEC 610000-4-4 IEC 610000-4-5 IEC 610000-4-6 EN 55022/CISPR22

Safety

IEC 60950

Shell Protection

IEC 60529 IP66

Operation

Storage

Transportation

5.1.4

ETSI EN 300 019-1-4 ZTE Enterprise Standards: Q/ZX 01397.01 ETSI EN 300 019-1-1 class 1.2 ZTE Enterprise Standards: Q/ZX 01397.01 ETSI EN 300 019-1-1 class 2.3 ZTE Enterprise Standards: Q/ZX 01397.01

Earthquake

ETSI 300 019-1-3

Vibration

ETSI 300 019-1-4 Clause 5.6

Fault Tolerance MTBF/MTTR Fault tolerance parameters include Residual Bit Error Ratio (RBER) and Mean Time Between Failures (MTBF). 

RBER