Zte ZXR10 8900 Series Technical specifications

OperatorLogo
ZXR10 8900 Product
Description

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved.
I
ZXR10 8900 Product Description
Version Date Author Approved By Remarks
V1.0 2008-05-30 Mao yucheng Gu chengyu Not open to the Third Party
V2.0 2009-09-09 Mao yucheng Gu chengyu Updating format
© 2009 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.

ZXR10 8900 Product Description
II © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
TABLE OF CONTENTS
1 Overview .....................................................................................................................1
2 Highlight Features......................................................................................................3
2.1 Advanced system architecture for high reliability ........................................................3
2.2 Powerful security function for Green network..............................................................3
2.3 Support of IPv6 for lower CAPEX................................................................................3
2.4 Support for MPLS L2/L3 VPN for all services implementation....................................3
2.5 Unified network management for lower OPEX............................................................4
3 Functionality...............................................................................................................5
3.1 Basic Function .............................................................................................................5
3.1.1 Layer 2 protocol supported..........................................................................................5
3.1.2 Layer 3 protocol supported..........................................................................................5
3.2 Service Functions ........................................................................................................5
4 System Architecture ..................................................................................................7
4.1 Product Physical Structure ..........................................................................................7
4.2 Hardware Architecture.................................................................................................7
4.2.1 System hardware architecture.....................................................................................8
4.2.2 Principle hardware system...........................................................................................9
4.2.3 Control and Switching Module...................................................................................10
4.2.4 Power Module............................................................................................................14
4.2.5 Interface Module........................................................................................................15
4.3 Software Architecture ................................................................................................40
4.3.1 System software architecture ....................................................................................40
4.3.2 Architecture of Layers and module discription...........................................................44
4.3.3 ROS...........................................................................................................................45
4.3.4 SSP Switching Subsystem ........................................................................................46
4.3.5 Coprocessor Software Subsystem ............................................................................47
4.3.6 Software Forwarding Support Subsystem.................................................................47
4.3.7 L2 Management and Protocol Subsystem.................................................................47
4.3.8 IP Supporting Protocol Subsystem............................................................................56
4.3.9 Unicast Routing Subsystem.......................................................................................58
4.3.10 Multicast Routing Subsystem ....................................................................................61
4.3.11 MPLS Protocol Subsystem........................................................................................61
4.3.12 Application sub-system..............................................................................................68
4.3.13 DHCP.........................................................................................................................68
4.3.14 Statistics and Alarm Subsystem................................................................................69
4.3.15 Security Subsystem...................................................................................................69
4.3.16 Maintenance and Management Subsystem..............................................................70
4.3.17 SNMP Subsystem......................................................................................................70
4.3.18 Monitoring Subsystem...............................................................................................71
4.3.19 IPv6 Subsystem.........................................................................................................71
5 Technical Specifications .........................................................................................71
6 Networking................................................................................................................75
6.1 Large scale MAN convergence layer networking application....................................75
6.2 Medium and small scale MAN core layer networking application .............................75
6.3 Campus Network Applications...................................................................................76

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved.
III
7 Acronyms and Abbreviations .................................................................................77

ZXR10 8900 Product Description
IV © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
FIGURES
Figure 1 Appearance of ZXR10 8902/8905/8908/8912...............................................................7
Figure 2 Hardware Architecture of ZXR10 8912/8908/8905........................................................8
Figure 3 Hardware Architecture of ZXR10 8902..........................................................................8
Figure 4 ZXR10 8905/8908/8912 System Hardware Schematic Drawing.................................10
Figure 5 ZXR10 8902 System Hardware Schematic Drawing...................................................10
Figure 6 ZXR10 8900 main control board Schematic Drawing..................................................11
Figure 7 8902 main control board Schematic Drawing..............................................................11
Figure 8 Back panel of 8912 main control card .........................................................................12
Figure 9 Back panel for 8908 main control card........................................................................12
Figure 10 Back panel for 8905 main control card........................................................................13
Figure 11 Back panel for 8902 main control card........................................................................13
Figure 12 8912/8908/8905 DC Power Supply Board...................................................................14
Figure 13 8912/8908/8905 AC Power Supply Board...................................................................15
Figure 14 8902 DC Power Supply Board.....................................................................................15
Figure 15 8902 AC Power Supply Board.....................................................................................15
Figure 16 44+4 FE optical interface board panel.........................................................................16
Figure 17 44+4 FE electrical interface board panel.....................................................................16
Figure 18 12-port GE Electrical Interface Board Panel................................................................17
Figure 19 12-port GE Optical Interface Board Panel...................................................................18
Figure 20 24-port GE Electrical Interface Board Panel................................................................19
Figure 21 24-port GE Optical Interface Board Panel...................................................................20
Figure 22 48-port GE Electrical Interface Board Panel................................................................21
Figure 23 48-port GE Optical Interface Board Panel...................................................................22
Figure 24 24-port GE Electrical +2-port 10G optical Ethernet Interface Board Panel.................24
Figure 25 24-port GE Optical interface +2-port 10G optical Ethernet Interface Board................26
Figure 26 2-port 10G Ethernet Optical Interface Board Panel.....................................................27
Figure 27 4-port 10G Ethernet Optical Interface Board Panel.....................................................28
Figure 28 8-port 10G Ethernet Optical Interface Board Panel.....................................................29
Figure 29 24-port GE mpls Optical Interface Board Panel ..........................................................31
Figure 30 48-port GE MPLS Electrical Interface Board Panel.....................................................32
Figure 31 48-port GE mpls Optical Interface Board Panel ..........................................................33
Figure 32 24-port GE Optical interface +2-port 10G MPLS optical Ethernet Interface Board.....34
Figure 33 4-port 10G MPLS Ethernet Optical Interface Board Panel..........................................36
Figure 34 24-port GE OAM Optical Interface Board Panel..........................................................37
Figure 35 The Panel of DPI Service Module................................................................................39
Figure 36 The Panel of FW board................................................................................................40
Figure 37 Architecture of the Operation Support Subsystem ......................................................42
Figure 38 Architecture of the L2 Subsystem................................................................................43
Figure 39 Architecture of the L3 Subsystem................................................................................44
Figure 40 ZXR10 8900 software architecture..............................................................................45
Figure 41 ZESR link down alarm .................................................................................................53
Figure 42 PBT message format and service implementation......................................................54
Figure 43 PBT CFM OAM link inspection and protection ............................................................55
Figure 44 PBT QoS service priority mapping...............................................................................56

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved.
V
Figure 45 Block Diagram of the Unicast Routing Protocol Subsystem........................................58
Figure 46 MPLS Operating Principles..........................................................................................62
Figure 47 MPLS Header Structure...............................................................................................63
Figure 48 Basic Model of BGP MPLS VPN .................................................................................64
Figure 49 Basic VPWS network model........................................................................................65
Figure 50 Basic VPLS network model .........................................................................................66
Figure 51 Large scale MAN convergence layer networking application......................................75
Figure 52 Medium and small scale MAN core layer networking application ...............................76
Figure 53 Campus Network Applications.....................................................................................76
TABLES
Table 1 ZXR10 8902/8905/8908/8912 physical parameters......................................................7
Table 2 The features of the ports on the main control board....................................................13
Table 3 The keys on the main control board ............................................................................13
Table 4 The indicators on the panel of main control board ......................................................14
Table 5 Specifications of the 12-port GE Electrical Interface Board.........................................17
Table 6 Specifications of the 12-port GE Optical Interface Board............................................18
Table 7 Specifications of the 24-port GE Electrical Interface Board.........................................19
Table 8 Specifications of the 24-port GE electrical Interface Board.........................................20
Table 9 Specifications of the 24-port GE Optical Interface Board............................................20
Table 10 Functions of the Indicators on 24-port GE Optical Interface Board.............................21
Table 11 Specifications of the 48-port GE Electrical Interface Board.........................................22
Table 12 Functions of the Indicators on 48-port GE Electrical Interface Board .........................22
Table 13 Specifications of the 48-port GE Optical Interface Board............................................23
Table 14 Functions of the Indicators on 48-port GE Optical Interface Board.............................23
Table 15 Specifications of the gigabit interfaces of the 24-port GE Electrical Interface+ 2-port
10G optical Ethernet Interface Board ..........................................................................24
Table 16 Specifications of the 10G interfaces of the 24-port GE Electrical Interface+ 2-port
10G optical Ethernet Interface Board ..........................................................................25
Table 17 Indicators on 24-port GE Electrical Interface+ 2-port 10G optical Ethernet Interface
Board............................................................................................................................25
Table 18 Specifications of the gigabit interfaces of the 24-port GE Optical Interface+ 2-port
10G optical Ethernet Interface Board ..........................................................................26
Table 19 Specifications of the 10G interfaces of the 24-port GE Optical Interface+ 2-port
10G optical Ethernet Interface Board ..........................................................................26
Table 20 Functions of the Indicators on 24-port GE Optical Interface+ 2-port 10G Optical
Ethernet Interface Board..............................................................................................27
Table 21 Specifications of the 2-port 10G Ethernet Optical Interface Board..............................28
Table 22 Functions of the Indicators on 2-port 10G Ethernet optical interface board................28
Table 23 Specifications of the 4-port 10G Ethernet Optical Interface Board..............................29
Table 24 Functions of the Indicators on 4-port 10G Ethernet optical interface board................29
Table 25 Specifications of the 8-port 10G Ethernet Optical Interface Board..............................30
Table 26 Functions of the Indicators on 8-port 10G Ethernet optical interface board................30
Table 27 Specifications of the 24-port GE MPLS Optical Interface Board.................................31
Table 28 Functions of the Indicators on 24-port GE MPLS Optical Interface Board..................31

ZXR10 8900 Product Description
VI © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
Table 29
Specifications of the 48-port GE MPLS Electrical Interface Board..............................32
Table 30 Functions of the Indicators on 48-port GE mpls Electrical Interface Board.................32
Table 31 Specifications of the 48-port GE mpls Optical Interface Board ...................................33
Table 32 Functions of the Indicators on 48-port GE mpls Optical Interface Board....................34
Table 33 Specifications o the gigabit interfaces of the 24-port GE Optical Interface+ 2-port
10G MPLS optical Ethernet Interface Board ...............................................................35
Table 34 Specifications o the 10G interfaces of the 24-port GE Optical Interface+ 2-port
10G MPLS optical Ethernet Interface Board ...............................................................35
Table 35 Functions of the Indicators on 24-port GE Optical Interface+ 2-port 10G Optical
Ethernet Interface Board..............................................................................................36
Table 36 Specifications of the 4-port 10G MPLS Ethernet Optical Interface Board...................36
Table 37 Functions of the Indicators on 4-port 10G MPLS Ethernet optical interface board.....37
Table 38 Specifications of the 24-port GE OAM Optical Interface Board...................................37
Table 39 Functions of the Indicators on 24-port GE OAM Optical Interface Board....................38
Table 40 Specifications of the DPI Board...................................................................................39
Table 41 Functions of the Indicators DPI Board.........................................................................39
Table 42 Specifications of the FWI Board ..................................................................................40
Table 43 Functions of the Indicators FW Board .........................................................................40
Table 44 Basic features for ZXR10 8900 series.........................................................................71
Table 45 Acronyms and Abbreviations.......................................................................................77

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved.
1
1 Overview
As Internet services are growing dramatically, IP has become the most widely used
transmission method for the new generation of network infrastructure in the world and
IP-based services will take the leading place in ISP networks. To be more competitive in
the transformation of communications networks, carriers are building broadband IP
networks to carry data, voice, and video services.
ZTE is an industry-leading data communication equipment provider. As one of the three
strategic products, data communication product line dedicates to advanced, stable and
reliable data products research and development, to provide operator, government, and
enterprise with full series of IP network data products and end-to-end individualized
solution.
ZXR10 8900 series Terabit MPLS routing switches are the latest introduced products by
ZTE with high capacity and performance for the core/aggregation layer of the network.
The series has the following models: ZXR10 8912, 8908, 8905, and 8902, among which
ZXR10 8912 reaches up to 2.88Tbps for the bandwidth of the backplane, 1152Gbps
switching capacity, 857Mpps packet forwarding rate. ZXR10 8900 family supports
L2/L3/L4 wire speed switching capability, mainly positioned at the core/aggregation layer
of carrier’s IP MAN, the campus, e-government and corporate network.
ZXR10 8900 series products adopt advanced modular design, a paralleling processing
mechanism based on multiple processors, and a CROSSBAR space-division switching
architecture. The key module adopts 1:1 redundancy backup. It support a wide variety of
interfaces, such as 10GE, GE and FE, providing multiple service functions such as ipv4,
ipv6, MPLS, NAT, multicast, QoS and broadband control. ZXR10 8900 Terabit routing
switch is applicable to the core layer and aggregation layer of various networks with its
high reliability, high scalability, and powerful service capabilities.
ZXR10 8900 series Terabit MPLS routing switch has the following features:
•Supporting IPV4 and IPV6 dual protocol stacking: supporting IPv4/IPv6 dual
protocol stacking, supporting high-speed IPv4/v6 transition mechanism, manual
general tunnel and automatic 6To4 tunnel.
•Hardware-based IP packet wire-speed forwarding: private ASIC design improves IP
packet processing and forwarding capability.
•Supporting complete routing protocols: unicast supports mainstream routing
protocols such as RIP, OSPF, IS-IS, and BGP4/BGP4+.
•Powerful MPLS support: adopting distributed hardware forwarding to fully satisfy
high performance and high reliability requirements of customers. Supporting MPLS
TE, MPLS VPN, FRR, VPLS, VPWS, and MCE.
•Enhanced Ethernet support: supporting EAPS-based ZESR (ZTE Ethernet Smart
Ring), ZESS (ZTE Ethernet Smart Switch) dual uplink protection, and PBT/MPLS-
TP

ZXR10 8900 Product Description
2 © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
•Traffic control and bandwidth control: implementing port, user or application-based
bandwidth control via hardware.
•Rich service functions: security, multicast, controllable multicast, cluster
management and online test.
•Complete security measures: system management security, routing protocol
security authentication, packet filtering and traffic classification, QinQ, user
authentication, and fine user binding.
•Complete network management: being able to implement the whole network
management during the whole course with ZTE NetNumen N31.
•High performance price ratio: has more competitive price with the same
performance and configuration compared with equipment from other vendors.

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved.
3
2 Highlight Features
2.1 Advanced system architecture for high reliability
With a distributed and modular design, ZXR10 8900 adopts a parallel processing
mechanism based on multiple processors and Crossbar architecture in ZXR10
8912/8908/8905, to ensure excellent forwarding performance, powerful service capability
and outstanding scalability.
2.2 Powerful security function for Green network
ZXR10 8900 supports ACL security filtering mechanism and provides security control
functions based on user, address, application and port. Supports MPLS VPN, support
port based queues with different priorities, flow-based ingress and egress bandwidth
restriction, uRPF, guard DDOS attack, SSH2.0 security management, 802.1x access
authentication and transparent transmission, and security functions such as VLAN ID,
MAC address, port number, and IP address bundling. In addition, the system has a
perfect anti-virus mechanism, providing a full security guarantee for reliable network
operations.
2.3 Support of IPv6 for lower CAPEX
Support various IPV6 protocol technologies, including IPV4 and IPV6 dual protocol
stacks, with transition technology when moving form IPV4 to IPV6 such as manual or
automatic configuration tunneling, supports IPV6 static routing. Support dynamic routing
protocols such as BGP4/BPG+, RIPng, OSPFV3 and ISISv6.
Support various IPV6 protocols including IPV4 and IPV6 dual protocol stacks, with
transition technologies form IPV4 to IPV6 such as manual or automatic configuration
tunneling and 6to4 tunneling. It supports IPv6 static routing. Support dynamic routing
protocols such as BGP4/BPG+, RIPng, OSPFV3 and ISISv6, which facilitates carriers to
implement smooth transition and upgrade to future network and protects their prior
investment.
2.4 Support for MPLS L2/L3 VPN for all services
implementation
ZXR10 8900 L2 MPLS VPN supports VPWS (martini) and VPLS, while L3 VPN complies
with RFC2547bis. The product can interwork with MPLS VPN service of devices from
other mainstream vendors. It supports MPLS-TE to guarantee reliability of network and
nodes.

ZXR10 8900 Product Description
4 © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
2.5 Unified network management for lower OPEX
ZXR10 8900 supports RFC1213 SNMP, with which the in-band NM can use Telnet (CLI)
or SNMP (GUI) to implement unified NM based on NetNumen platform.
NetNumen N31 is a data network management platform designed with the latest Internet
technology. As a highly customized carrier-class data network management platform, it
is designed with the bottom-up approach and spans various platforms. The platform
implements unified management and the control of all the data products of ZTE.

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved.
5
3 Functionality
ZXR10 8900 series Terabit MPLS routing switches are the latest introduced products by
ZTE with high capacity and performance for the core/aggregation layer of the network.
The series has the following models: ZXR10 8912, 8908,8905 and 8902 among which
ZXR10 8912 reaches up to 2.88Tbps for the bandwidth of the backplane, 1152Gbps
switching capacity, 857Mpps packet forwarding rate. ZXR10 8900 family supports
L2/L3/L4 wire speed switching capability, mainly positioned at the core/aggregation layer
of carrier’s IP MAN, campus, e-government and corporate network.
3.1 Basic Function
3.1.1 Layer 2 protocol supported
•Supporting IEEE 802.3,IEEE 802.3u,IEEE 802.3z,IEEE 802.3x,IEEE 802.1p and
etc.
•Supporting IEEE 802.1d STP(Spanning Tree Protocol),MSTP(Multiple Spanning
Tree Protocol),RSTP(Rapid Spanning Tree Protocol).
•Supporting IEEE802.1q, number of VLAN 4096, support VLAN extension (QinQ).
•Supporting ZESR(ZTE Ethernet Smart Ring) technology.
3.1.2 Layer 3 protocol supported
•Supporting IPv4 routing protocols such as RIPv1/v2, OSPF, BGP, and IS-IS.
•Supporting IPv6 RIPng, BGP4+, OSPFv3, and IS-ISv6.
•Supporting 6to4 tunneling, 4over6 tunneling, and 6PE.
•Supporting MPLS protocol.
3.2 Service Functions
•MPLS VPN: Distributed hardware forwarding, L2 VPLS and VPWS (Martini), L3
RFC 2547bis protocol.
•Multicast: supporting multicast routing protocols such as IGMP, PIM-DM/SM,
DVMRP, MSDP, and MBGP.

ZXR10 8900 Product Description
6 © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
•Bandwidth control: Implementation based on port, application and traffic-based
bandwidth control with granularity of 64K.
•Authentication: supporting 802.1x and RADIUS Client.
•DHCP: supporting DHCP Relay.
•Supporting port mirroring: mirroring implementation including control module,
particular ports and particular slots.
•QoS: ZXR10 8900 series switch provides complete QoS support for IP DiffServ
solution. It is completely compatible with standards of DiffServ solution including
RFC2474, RFC2475, RFC2497, and RFC2498. It supports packet 802.1p and
DSCP priority re-marking, packets sending and receiving rate restriction at port,
packet re-orientation, CAR, 8 port output queue, port-based queue scheduling (SP,
WRR, WFQ, SP+WFQ, and SP+WRR), and QoS Profile management. It permits
QoS service solution customization by users to support DiffServ components
(including classifier, marker, measuring unit, shaper and dropper) and various PHB
(congestion management and congestion avoidance). It supports 8 priority queues,
L2-based priority queue, L3-based source and destination traffic control and L4
source and destination traffic control.
•ACL: ZXR10 8900 series have powerful ACL functions. It implements ACL filtering
by hardware. It can implement full wire-speed ACL. 8900 series switch ACL is
divided into 4 categories: standard ACL, extended ACL, L2 ACL and hybrid ACL.

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 7
4 System Architecture
4.1 Product Physical Structure
The appearance of ZXR10 8912/8908/8905/8902 terabit MPLS routing switch is shown
in Figure 1. See Table 1 for equipment size.
Figure 1 Appearance of ZXR10 8902/8905/8908/8912
Table 1 ZXR10 8902/8905/8908/8912 physical parameters
Items Description
8902 8905 8908 8912
Physical
parameters
of the
device
Dimension
(Width*Height*Depth)
442mm×
175mm×
420mm
442mm×
440mm×
450mm
442mm×
577mm×
450mm
442mm×
755mm×
450mm
Weight <25kg <38kg <49kg <65kg
4.2 Hardware Architecture
This chapter mainly introduces system hardware and operation principles of ZXR10
8900 series Switches, helping people to have a better understanding of this system. It
includes the system’s general structure, functional modules, board schematics, and
operation principles. The general architecture of the system, functional modules, the
figure of board and the operation philosophy are as shown in the follows.

ZXR10 8900 Product Description
8 © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
4.2.1 System hardware architecture
8900 Series Switches are designed to be installed in racks. The system uses a large-
capacity and high-speed serial bus backplane to connect the main control board to all
service line cards. The control and switch matrices supporting 1:1 redundancy are
combined in one, A large-capacity switch matrix is used to guarantee the switching
capacity that the system may need when it is operating at wire speed. The control board
uses a high-performance CPU and large memory to ensure adequate storage space for
speedy protocol processing and huge table contents. Each line card provides packet
processing capability at wire speed through ASIC and offers 10G, 1G and 100M
interfaces according to different services.
Figure 2 Hardware Architecture of ZXR10 8912/8908/8905
Figure 3 Hardware Architecture of ZXR10 8902
•Large-capacity high-speed backplane

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 9
The system uses a passive large-capacity high-speed backplane to connect the
main control board and all line cards to ensure adequate switching capacity for
system operation and to reserve enough bandwidth for future upgrade.
•Main control board
The main control board is an important integrated board with 1:1 redundancy. Each
main control board consists of one high-performance and large-capacity CPU, large
storage space, one inter-board communications switching module, one system
monitoring module, and one clock module. There is one large-capacity switching
matrix existing in 8912, 8908 and 8905 respectively. Two main control boards are
closely connected in operation.
•Service line card
After processing the messages, the service line card will send these messages to
the particular ports of the destination service line cards as per the processing
results. As each service line card has its own forwarding table to implement local
forwarding, the wire-speed switching capability can be guaranteed. There are many
types of service line card. According to current demands, the following service line
cards can be provided:
−100M Ethernet service card
−1000M Ethernet service card
−10G Ethernet service card
4.2.2 Principle hardware system
ZXR10 8912/8908/8905 10G MPLS Switches are large-capacity rack-mounted 10G
Ethernet switches. Two-level hardware-based switching is implemented to realize wire-
speed switching of every level. Switching of the first level occurs between ports of line
cards. The second level of switching controlled by the main control board occurs
between line cards. As the first switching is very smart, all the ports make their
forwarding decisions at in this stage. The switching chip of this level is usually called
packet processor (PP). The second level switching is cross-connect matrix switch, which
connects all packet processors and performs switching according to simple labels,
constituting a large-capacity switching system.

ZXR10 8900 Product Description
10 © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
Figure 4 ZXR10 8905/8908/8912 System Hardware Schematic Drawing
The architecture of ZXR10 8902 in is different. The first level switching is implemented
over ports, and the second switching carried out between two line cards will be
implemented via high-speed XAUI bus.
Figure 5 ZXR10 8902 System Hardware Schematic Drawing
Presently, the line cards of ZXR10 8900 series 10G MPLS routing switches are
universal. The schematic drawings of ZXR10 8900 series including control module,
switching module, packet processing module, interface module and power supply
module are as shown in Figure 4 and Figure 5.
4.2.3 Control and Switching Module
ZXR10 8900 has switching and management module integrated on one main control
card in practice. Its principle diagram is shown in Figure 6.

ZXR10 8900 Product Description
ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 11
Figure 6 ZXR10 8900 main control board Schematic Drawing
SDRAM
BOOTR
OM
Switching
Fabric
Serdes
Serdes
CP
U
Console
Management
In practical operation, the main control board of ZXR10 8902 implements control feature,
which is as shown in Figure 7.
Figure 7 8902 main control board Schematic Drawing
4.2.3.1 Control Module
Control module composed by master processor and some external functional chips
provides all kinds of interfaces, for example, serial port and Ethernet port, to enable the
system to process all types of applications. Acting as the master processor, the high-
performance POWER PC processor can support SDRAM of up to 1G, 64M FLASH
program storage and 512K BOOYROM to complete the following tasks:
•System network management protocols, e.g. SNMP.
•Network protocols, e.g. OSPF, RIP, BGP-4.

ZXR10 8900 Product Description
12 © 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
•Providing interfaces for the operation and management of all the line cards.
•Carrying out data processing and maintenance.
4.2.3.2 Switching Module
Designed with particular CROSSBAR chip, the switching module centralizes multiple
high-speed bidirectional interfaces, so it can implement wire-speed switching of multiple
line cards. The switching chip has the following features:
•Storing, forwarding, and switching data.
•Supporting jumbo frames of up to 9 KB
•Supporting priority-based queue. When CoS queues are congested, frames can be
discarded selectively.
•Each port provides a set of counters for management and control.
4.2.3.3 Panels and Performance
The back panel for 8912 main control card is shown in Figure 8:
Figure 8 Back panel of 8912 main control card
First-generation and second-generation back panel for 8908 main control card are
shown in Figure 9:
Figure 9 Back panel for 8908 main control card
Back panel for 8905 main control card is shown in Figure 10: