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SYSTEM ARCHITECTURE OF ZXJ10(V10.0)

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Presentation on theme: "SYSTEM ARCHITECTURE OF ZXJ10(V10.0)"— Presentation transcript:

1

2 SYSTEM ARCHITECTURE OF ZXJ10(V10.0)

3 CONTENTS Overall System Structure The Structure of Peripheral Switching Module(PSM : 8k) 4k and RLM Switching Network Module The Concrete Configuration of PSM

4 OVERALL SYSTEM STRUCTURE

5 THE FEATURES OF THE ZXJ10 SWITCH MODULAR SYSTEM STRUCTURE
Switching Network Module (SNM) Message Switching Module(MSM) Operation and Maintenance Module (OMM) Peripheral Switching Module (PSM) Remote Switching Module (RSM) Central module

6 MODULAR SYSTEM STRUCTURE
Remote Subscriber Line Module (RLM) Packet Switching Handling Module (PHM) Mobile Switching Module (MPM) Internet Access Module (IAM) (IP access Server)

7 PERIPHERAL SWITCHING MODULE (PSM)

8 MAIN FUNCTIONS OF A PSM In the Single Modules Office ,It Performs the PSTN,ISDN Subscriber Access and Call Handling, In a Multi-module Office ,It Is Connected Into the Central Module As One of the Module Offices .

9 PSM cabinets Control cabinet #0 Subscriber cabinet #1

10 8K SWITCHING MODULE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 P O W B D T I A S G B D T 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 P O W B D T I A S G B D T 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 B C T L P O W B S M E MP C D N 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 B N E T P O W B C K I S Y D N F 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 B S L C P O W A S L C I 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 B S L C P O W A S L C M T 1

11 THE STRUCTURE OF THE PSM
DTI: Digital Trunk Interface (One DTI Module is handle 4 PCM) SLU: Subscriber Line Unit (13 SLU in One PSM) SLC: Subscriber Line Circuit (One SLU have 40 SLC and One SLC have Subscribers) 40 X 24 = 960 Subscriber. 960 X 13 = Subscribers in one PSM. Maximum Subscriber Capacity is 500,000 Maximum Trunks Capacity is Trunks DSN: Digital Switching Unit (Simplified as T-Network)

12 THE STRUCTURE OF THE PSM
DSNI: Digital Switching Network Interface FBI: Fiber Bus Interface SYCK (Synchronization Oscillator) CKI Function is to provide generate system clock in case of reference failure for SYCK. MTT: Multi Task Test Board SP: Subscriber Processor SPI: Subscriber Processor Interface PEPD: Environment parameter detecting board ASIG: Analog Signaling Unit MP: Main Processor COMM: Communication Module MONI Monitoring board

13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 POWERA SLC S L C SPI MTT SP POWERA SLC S L C SPI MTT SP POWERA SLC SLC SLC S L C SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SPI SPI POWERA POWERA SLC SLC SLC S L C SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC SLC MTT SP SP POWERA

14 THE STRUCTURE OF A PSM × Digital trunk unit Subscriber unit MFC DTMF
TONE 8Mb/s FBI SNM COMM V5.2 No.7 16*8Mb/s MP0 MP1 2 Mb/s Signaling unit 2Mb/s Switching unit 8K

15 THE STRUCTURE OF THE PSM
PSM Consists of the Following Basic Parts: Switching Unit Subscriber Unit Digital Trunk Unit Analog Signaling Unit Control Part Synchronization Part

16 THE STRUCTURE OF THE PSM
Switching Network Layer 1 2 3 4 5 6 7 8 9 P O W B C K I S Y D N T L F CKI: Function is to provide generate system clock in case of reference failure for SYCK SYCK: Synchronization Oscillator

17 Working Mode: Active/Standby active standby MP/DSN /DSNI-SP

18 THE STRUCTURE OF THE PSM
Switching Network Unit DSN Unit Can Handle Time Slot Switching of the Voice Channel. And Control Message Channel Constitution:2 DSN boards DSN DSN Work mode:active /standby

19 DIGITAL SWITCHING NETWORK
2 DSN Board in a PSM Working Mode :Active/standby Each DSN Board Is a Time Division Non-blocking Switching Network With Embedded T&S Structure

20 DIGITAL SWITCHING NETWORK
Main Function: Performing Voice Channel Connection Switching of Subscribers Inside the Module; Interconnected With Central Switching Network Module to Realize Inter-module Voice Channel Connection; For Mp to Set up Message Switching Connection and Communication Via Semi-permanent Connections With Function Units;

21 Switching network unit
THE STRUCTURE OF A PSM Switching network unit 63 T network unit 1 ………... 62 2 61 ………... 31 32 a 8K×8K T network. 64 bi-directional HW at 8Mb/s(128TS)

22 HWS DISTRIBUTION OF DSN IN PSM
Each DSN board has 64 HWS. A HW bus rate is 8Mb/s(128ts) Each DSN board has a capacity of 8K*8K time slots

23 HWS DISTRIBUTION IN PSM
Message communication 1 2 3 DSN 20 21 22 4 5 6 18 19 Connected with various units Inter-module connection 60 61 Standby HW line 62 63 Self-looping testing

24 HWS DISTRIBUTION IN PSM
Those Starting HW20 Upward Are Used for Connection With Subscriber Units. Each Subscriber Unit Seizes Two HW Lines; Those Starting Hw61 Downward Are Used for Connection With Digital Trunks and Analog Signaling Units. Each Unit Seizes One HW Line; Function SN. HW0~3 4HW Used for Message Communication HW4-19 16HW Used For Inter-module Connections HW20-61 42HW Used for Various Unit Connection Usually a Standby HW Line, Though It Can Also Be for Communication Between Units HW62 1HW HW63 1HW Used for Self-looping Testing

25 DSNI(DIGITAL SWITCHING NETWORK INTERFACE BOARD)
Classification: An interface of MP level (MP-T network) An interface of SP level (SP –T network)

26 DSNI-C (DIGITAL SWITCHING NETWORK INTERFACE BOARD)
Function: An interface of MP level (MP- DSN) It Drives the Various Signals Transmitted Between MP and DSN. It Performs the Conversion of 8mb/s Data Stream and 2mb/s Data Stream. A Pair of DSNI Boards Handle 4 HWs. MP--COMM--DSNI-C--DSN

27 DSNI-S (DIGITAL SWITCHING NETWORK INTERFACE BOARD)
Function: An interface of SP level (SP – DSN) It Drives Transmission Between Function Unit and DSN. No Data Rate Conversion A Pair of DSNI Boards Can Handle 16 HWs. SP--DSNI-S--DSN

28 FBI (Fiber Bus Interface)
It Applies Synchronous Multiplexing Technique and Optical Fiber Technique to Implement the Interconnections of Modules . It Uses Two Optical Fiber Lines to Transmit up to 16 Lines of 8mb/s PCM Signals It Can Reduce Connection Wires and Increase Anti-interference Ability of the System, and to Reduce Mutual Cross Talks Among Wires.

29 FBI(Fiber Bus Interface)
Note : When HW Lines 4~19 Are Used for Intra-module Unit Connection,the FBI Board Must Be Replaced by the DSNI.

30 THE STRUCTURE OF THE PSM
Subscriber line unit 1 2 3 4 5 6 7 8 9 P O W A S L C I P O W A S L C 1 2 3 4 5 6 7 8 9 M T A

31 THE STRUCTURE OF THE PSM
Subscriber line unit 2 SP:Active/standby 2 SPI(SP interface);active/standby MTT(multi-task test board):used for subscriber line test Max.40 SLC(subscriber line circuit) Each SLC board can provides 24 subscriber lines A subscriber unit occupies 2 HWs and 2 Comm. ports

32 THE STRUCTURE OF THE PSM
Digital trunk unit

33 THE STRUCTURE OF THE PSM
Digital trunk unit The Digital Trunk Unit Is the Interface Unit Between the Digital Switching System or Between Digital SPC Switches and Digital Transmission Devices. A B DT DT PCM 2Mb/s

34 THE STRUCTURE OF THE PSM
Digital trunk unit One DT unit only has one DTI board One DTI board has 4 PCM (sub-unit) DTI PCM1 Provide 120 digital trunk subscribers for every board PCM2 PCM3 PCM4

35 THE STRUCTURE OF THE PSM
Classification: DTI can be configured as CAS CCS Module Connect(Connection between modules) BRSU/ARSU (Connection with RLM/RSU) ISDN PRA (Primary Rate ISDN) One digital trunk unit occupies 1 HW,1 comm. port.

36 THE STRUCTURE OF THE PSM
Analog signaling unit One Analog signaling unit only has one ASIG board. ASIG board can be configured as ---DTMF function ---MFC function ---TONE function ---CID function ---Conf. function

37 The structure of the PSM
Analog signaling unit Each ASIG Provides 120 Channels. One ASIG Board Is Divided Into 2 Sub-units,to Be Separately Configured. DSP2# DSP1#

38 DSP2# DSP1# ASIG-1: With all the chip Chip 1: TONE/DTMF/MFC/CID/CONF
ASIG-2: W/O Conf. Chip for both DSPs Chip 1: DTMF/MFC/CID Chip 2: DTMF/MFC/CID ASIG-3: With TONE only for DSP1 Without Conf.Chip for both DSPs Chip 1: TONE/DTMF/MFC/CID Chip 2: DTMF/MFC/CID 交换机中的语音资源由音板提供,目前使用有两种:4M和64M音板。一块4M音板最多有2个音子单元,可录制16分钟左右,每个音子单元含有1片EPROM和2片FLASH MEMORY,程序固化在EPROM中,而语音通知音则加载到FLASH MEMORY里,可以平均分成256个音元。语音资源分两类,1类是交换机系统的呼叫业务所需的拨号音、忙音、证实音、空号音、特种拨号音、拥塞音等,他们的产生是根据国际通断比进行通断控制而生成的;另一类是语音通知音,它首先由录音设备录好相应语音,因为由录音设备所产生的语音文件有其特有的格式,所以需采用C语言程序(FLASH.CPP)将其转变为语音存储器中的数据格式并生成文件FLASH.DAT,然后由MP通过COMM经T网把录音数据发送到ASIG板上,最后由386EX通过双口RAM编程到FLASH MEMORY中。

39 THE STRUCTURE OF THE PSM
Control part P O W B S M E C 1 2 3 4 5 6 7 8 T V D N

40 THE STRUCTURE OF THE PSM
Control part A Pair of Active and Standby MP Shared Memory Board(SMEM) Communication Board(COMM) Monitor Board(MON) Peripheral Environment (PEPD)

41 SP---DSNI---DSN(T-network)---DSNI---SP
THE VOICE CHANNEL Suppose one subscriber in one SLU call another subscriber in another SLU,the voice channel will be as follows. SP---DSNI---DSN(T-network)---DSNI---SP

42 The Message Channel SNM or other PSM DSNIC HW0至HW3 FBI MP C O M DSN
DSNI-S function unit

43 THE STRUCTURE OF THE PSM
Clock synchronous part Retrieving the reference clock from the superior exchange(DTI or FBI) ,it provides synchronization timing signals SYCK SYCK CKI Working mode:Active/standby

44 Other country international office
SYNCHRONIZATION MODE Other country international office Plesiochronous International office International office LS TS TS Master/slave synchronization Plesiochronous LS LS TMS Master/slave synchronization BITS(building integrated timing supply) RSM End office

45 THE STRUCTURE OF THE PSM
Clock synchronous unit 2 SYCK boards 1 CKI board SYCK(synchronization oscillator) According to the reference clock generates the synchronous clock for the module or system(PSM).

46 THE STRUCTURE OF THE PSM
Clock synchronous unit CKI Function is to provide generate system clock in case of reference failure for SYCK.

47 4k Switch module 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 B C T N S L P O W M E D A I G

48 Compact switching module
Flexible configuration COMM board 9,10 slots: Inter-module communication 11,12 slots: Intra-module communication 13,14 slots: NO.7,V5 boards ASIG board: 19-21 slots: Can share trunk slots DT board: 22-26 slots: 25,26 slots can be shared by DTI and ODT. PCM1 PCM2 PCM3 PCM4 E1:

49 HW 0-3 4 5 6 7 8 9 10-13 14-17 Hw 0,2 for communication Hw 1,3 idle
Hw for SP .. MP .. .. .. ASIG ASIG ASIG DT DT DT ODT /DT ODT /DT .. HW

50 Compact switching module
Flexible configuration: T Net & HW lines HW0--HW2: Used for communication HW1--HW3: Idle HW4-HW6: Distributed to ASIG HW7-HW9: Distributed to DT HW10-HW17: Distributed to ODT HW18-HW29: Distributed to SP HW30-HW31: Used for self-looping

51 RLM(RSU) RLM:Remote subscriber line module , RSU
It is a subscriber unit used in a remote subscriber group . Each RLM is usually restricted to with in 960 subscriber lines. The way of connection between the PSM and RLM can be RDT board or RODT board.

52 RSU 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 B R S U L C P O W E D T A M I

53 ---used also as the DTMF number receiver and TONE voice resource.
MTT (multi-task test)board: ---used also as the DTMF number receiver and TONE voice resource. REPD board: ----control the power board and ODT board ----clock synchronization for RLM.

54 The Configuration of PSM

55 THE CIRCUIT DESCRIPTION
Format: Module number_rack number_shelf number_board position number_circuit serial number

56 The circuit description
Module number: PSM form an single module: #2 Rack number: 1 control rack and 1~4 subscriber rack. The control rack number:#1 The subscriber rack number:#2~#5

57 The circuit description
Shelf number: 1# ~ 6# (starting from the bottom shelf ) Board position number: 1# ~ #27 Circuit serial number: 0#~ SLC:0~23 DTI: 0~127

58 The circuit description
Subscriber line : Each analog subscriber board:24 subscriber circuits Each shelf;20 ASLC board Each subscriber unit :2 shelf Each subscriber unit:40*24=960 subscriber lines Each PSM: 13 subscriber units, 13*960=12480 subscriber lines

59 The circuit description
Digital trunk : Each DTI board :4 PCM (4*2Mb/s ports=120 voice channel)

60 The structure of background network

61 NT Server MP MP protocol TCP/IP router NT Client NT Client .. DDN PSTN/PSPDN NT Client NT Client NT Client

62 The structure of background network
The Network Contain 3 Types of Nodes: Foreground Active/standby MP Background Servers(server) Background Maintenance Terminal(clients)

63 The structure of background network
MP (foreground ) connects with background by the Ethernet. It uses the HUB to connect each other. The communication protocol is TCP/IP. The operating system of Sever and Client is WINDOWS NT

64 The structure of background network
Each MP and the computer in background have a IP address respectively. The arrangement is as follows: 1~128 identify the active/standby Mps of the 64 modules(MP nodes) 129~133are background NT Server nodes 134~187 are background Client nodes 254 is for the specific alarm panel.

65 ZXJ-10 System Feature

66 Feature of ZXJ-10 Single Module 12480 Subscribers 2880 Digital Trunks
Traffic capacity: More than 4200 Erl. BHCA: The tested result is more than 600K 48 NO.7 links or 24 V5.2 interfaces. Active/ Standby non-blocking switching network of 8K×8K

67 Multi-Module. (62 Modules)
Subscribers 64000 Digital Trunks Traffic Capacity: More than130000Erl BHCA: More than 7800K Switching Network can be 32K, 64K, 128K, and 256K

68 Operation and Maintenance
According to the size of modules, SNM can be such types as of 32K, 64K, 128K, and 256K, of which 32k network can be employed to connect with 13 PSMs and 35 RSMs. The ZXJ10 SPC exchange employs the centralized maintenance & management mode. Its maintenance & management network has applied not only the client/server structure, which is based on the TCP/IP protocol, but also the WINDOWSNT4.0 operation system. Its contents contain such things as data, statistical traffic, billing, system measurement, system alarm, etc, which are substantial for the management and the maintenance of the exchange. The handling of the software and the data of the whole system is executed in OMM. Then SNM transmits the results to each peripheral module, and can be under remote operation as well as maintenance management. The main processor of MSM (or other PSM modules) can be connected into Ethernet via the standard TCP/IP protocol. Thus, the message inter working between OMM and the foreground processor is available.

69 Operation and Maintenance

70 Rich Services Abbreviated dialing Hot-line service with time-out
Call restriction Don’t disturb service Absent-subscriber service Malicious call tracing Interception of calls Wake-up services Call forwarding no reply Call forwarding unconditional Call forwarding on busy Call back on busy

71 Rich Services Register on busy Call waiting Three party service
Conference calling Caller identification (CID-I, CID-II) Restriction to the caller identification Customer own number reported service Multiple subscriber number (MSN) Office code restriction function: To any subscriber of ZXJ10, the coded office numbers can be restricted at the maximum of 96

72 ZXJ-10 provides standard ISDN interfaces
2B+D interface 30B+D interface

73 The Standardized Supplementary Services
Direct dial in (DDI) Multiple subscriber number (MSN) Calling line identification presentation (CLIP) Calling line identification restriction (CLIR) Connected line identification presentation (COLP) Connected line identification restriction (COLR) Sub-addressing (SUB) Call forwarding on busy (CFB) Call forwarding no reply (CFNR)

74 The Standardized Supplementary Services
Call Forwarding Unconditionally (CFU) Call Waiting (CW) Call Holding (CH) Terminal Portability (TP) Conference Calling (CONF) Three-Party Service (3PTY) Closed User Group (CUG) User-User Signaling Service

75 Extra New ISDN Services Besides the Supplementary Ones
Don’t Disturb Service Hot Line Without Time-Out Call Out Restriction Wake-Up Service

76 NO.7 Signaling System The link number is more than 512, which can be up to 1280 when serving as the independent STP. The number of the signaling link groups is more than 256, which can be up to 640 when serving as the independent STP. The routing area number is over 2000. The simultaneously supported signaling networks can be up to 8. The load of each signaling link exceeds 0.8Erl. The systematic GTT capability exceeds 4,000GTT/s. The number of GT stored by GT translation table exceeds 200,000. Serving as the independent STP, the system signaling processing capability exceeds 40,000MSU/s. Serving as the independent STP, the STP transit delay is below the national standard.

77 User Type Telephone Set, PABX
Public phone (RASL( reverse polarity subscriber), PASL 16KC charging phone) DDN private line subscriber Centrex subscriber 2B+D and 30B+D subscribers IP Access subscriber

78 Numbering Plan The numbering plan can adapt such conditions as the local connection in the networks with both equal number length and unequal number length, the automatic, semi-automatic, manual connection of domestic and international long distance call, special call services, test call and also the numbering requirement when utilizing new services. The numbering plan is flexible. Number modification can be achieved by man-machine commands. It adapts the future change, increase and decrease in specific numbering mode.

79 Capability of Number Storage and Analysis
Receiving and storing of 16-digit valid calling number, expandable to 20 digits. Analyzing 1 to 8 digits numbers by demand, to meet the requirement for determining the call type, route selection plan, called number length and charging rate. There are different number translation tables for different user groups. Number digits increasing, decreasing or translating according to the received number, income trunk or circuit services type. It meets the requirement of route selection or special connection establishment. The received number is delivered to the destination wholly or partly, and the transmission mode of end-to-end or link-by-link as well as the transmission mode in group or receiving-while sending mode is adopted. The capability of number processing and analyzing is adaptable to the requirement of future network change.

80 Routing In the range of nominal trunk amount, the number of trunk routes and circuits per route can be assigned according to requirement. To one target office, the number of direction for routing is not less than 5. Routing principle: choosing direct route at first, then choosing the first bypass route, then the second, choosing the final route at last. Complete utilization for the selection of each route circuit group. The traffic load of each circuit will be averaged. The office-to-office trunk of local offices group is utilized.

81 Time Monitor Not dialing after hook-off: 10 seconds
Not dialing between digits: 20 seconds No answer of local call: 60 seconds No answer of long distance call: 90 seconds No answer of international call: 120 seconds Howler tone: 60 seconds Busy tone: 40 seconds (adjustable)

82 Capability of Traffic Load
The traffic load of trunk and subscriber line is shown as the following table: Reference load Subscriber line Trunk Load 0.25Erl/line 0.8Erl/trunk

83 Design of Reliability and Availability
Hardware: 1. The key parts adopt active /standby structure 2. Hardware design 3. SMT technology, ASIC, EPLD, FPGA and DSP technology is utilized. 4. Optical fiber connection between modules 5. High reliable components are adopted 6. Meeting the electromagnetism compatible test 7. Adopting the forced cooling mechanism 8. Adopting three-level over-voltage, over-current protection mode, it will recover automatically when over-voltage and over-current.

84 Software 1. Adopting object-orient technology, software engineering and modular design 2. Fully adopting HDLC protocol for communication in modules and between modules 3. Adopting advanced network OS and large scale relevant database 4. Adopting multiple level inspection, diagnosis and restart mechanism 5. Adopting multiple level protection mechanism in charging 6. Software trash processing program 7. Adopting four-level load control

85 Subscriber Line and Signaling Receiver Index
Subscriber line index Subscriber loop resistance: <2000 Ohm (3000 Ohm max) Feed current: >18mA Isolation resistance between lines and between line to ground: >20000 Ohm Capacitance between lines: 0.7 μF Subscriber signal index Pulse receiver: Pulse speed is 8~14 pulses/sec

86 Subscriber Line and Signaling Receiver Index
Make-break ratio 1:1.6±0.3 Interval between pulse strings: 350ms Subscriber signal index relative with MFPB telephone: Reliable receiving within 2.0% frequency offset; No receiving over 3.0% frequency offset; Receiving not for sure within 2.0%~3.0% frequency offset. While working in dual frequency, single frequency receiving level range is -4~-23dBm, single frequency no response level is -31dBm Level difference between two frequencies: <=-6dB

87 Over-Voltage Protection
Exposed (no first level protection), the over-voltage protection ability is more than Thunder wave: 10μS/700μs, voltage peak value is 1000V Power line induction: voltage is 650 V r.m.s, duration time is 500ms Power line touch: voltage is 220V r.m.s, duration time is 15min. Unexposed (with first level protection), the over-voltage protection ability is more than Thunder wave: 10μS/700μs, voltage peak value is 4000V Power line induction: voltage is 650V r.m.s, duration time is 1s.

88 Network Synchronization
The clock and synchronization of the ZXJ10 switch accords with the Recommendation of G.811, G.812 and G.813, providing the grade 2 and grade 3 clock. 1. Synchronization mode: master/slave. 2. Clock working mode: both grade 2 and grade 3 clocks have rapid capture, tracing, holding and free running mode. 3. Redundancy: both grade 2 and grade 3 clocks have two independent clocks with same function, while one clock is fault, another clock can work proper immediately. There are 2~4 selections for reference clock, and with failure auto-switchover function. The BITS interface function is included in the ZXJ10 switch. 4. Clock reliability: MTTR of ZXJ10 clock is more than 10 years. 5. Accuracy: second level clock: ±4*10-7, third level clock: ±4.6*10-6

89 Network Synchronization
6. Initial max frequency offset: second level clock: <5*10-10, third level clock: <1*10-8 7. Max frequency offset: second level clock: <1*10-9/day, third level clock: <2*10-8/day 8. Draught range: second level clock: synchronized with the clock of ±4*10-7 accuracy. third level clock: synchronized with the clock of ±4.6*10-6accuracy. 9. Phase stability: change is less than 1/8 UI during the any time of 211UI While more or equal with 211UI, the phase change of every 211UI interval is less than 1/8 UI, and total wander is less than 1μs. Long period phase change: in any term of S>=100s, the max time interval error of output clock is less than 1μs. 10. Synchronization link interface: meeting the ITU -T G


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