SJ 20680-1998 General specification for communication group interface module
Some standard content:
Military Standard for Electronic Industry of the People's Republic of China FL5850
SJ20860—-2003
General specification for military access equipment of optical cable fibercable2003-06-04issued
2003-12-01implemented
approved by the Ministry of Information Industry of the People's Republic of Chinaforeword
referenced documents
product specifications
qualification.
system composition and equipment type
performance characteristics
reliability
maintainability
interchangeability
environmental adaptability.
electromagnetic compatibility
safety
man-machine-environment engineering
usability
productivity
standardization
thermal design
equipment structure
equipment shell
installation characteristics.
marks and codes
appearance quality.
components Components, parts and materials
Accessories, accessories and repair parts
Technical data.
4 Quality assurance regulations
Inspection classification
Inspection conditions
Identification inspection
Quality consistency inspection
Defect classification
Inspection and test methods
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SJ20860—2003
SJ20860—2003
5 Delivery preparation
5.1 Packaging,
5.3 Marking
5.4 Transportation.
5.5 Storage.
Notes.
Intended use.
Contents of ordering documents
Abbreviations
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry.
This specification was drafted by the 34th Institute of China Electronics Technology Group Corporation. The main drafters of this specification are: Yu Shoukang, Liang Ying. -niKAoNKAca=
SJ20860—2003
1 Scope
General Specification for Military Optical Cable Connection Equipment
SJ20860-2003
This specification specifies the requirements, quality assurance regulations and delivery preparation of military optical cable connection equipment (or system) (hereinafter referred to as equipment or product).
This specification is applicable to military ground fixed, vehicle-mounted and other optical cable connection equipment, and can also be used as a reference for other military optical communication equipment.
2 Referenced Documents
The relevant clauses in the following documents are incorporated into this specification by reference. For any referenced document with a date or edition, any subsequent amendment (excluding errata) or revised version is not applicable to this specification, but it is recommended that all parties using this specification explore the possibility of using its latest version. For any referenced document without a date or edition, the latest version shall apply to this specification. GB/T3181-199s Paint film color standard
GB5081-85 Guide for collecting data on reliability, effectiveness and maintainability of electronic products on site GB/T16814--97 Measurement methods for synchronous digital hierarchy (SDH) optical cable line system GJB150.1f-86) Environmental test methods for military equipment Salt spray test GJB151A-97 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems GJB152A-27) Measurement of electromagnetic emission and sensitivity of annual equipment and subsystems GJB179A-96 Count sampling inspection procedures and tables GJB367A--2001 General specifications for military communication equipment GJB1765-93 Military material packaging markings
GJB2072-94→ Maintainability test and assessment GJB2082-94 Classification of visual defects and mechanical defects of electronic equipment GJB3437-98 (Requirements for interconnection interfaces of regional communication networks of integrated communication systems. GJB/Z113-98 Standardization review
ITU-T Recommendation G.65 Characteristics of single-mode optical fiber cables ITU-T Recommendation G.703 "Physical/electrical characteristics of series digital interfaces Synchronous digital series bit rate
ITU-T Recommendation G.707
ITU-T Recommendation G.714
ITU-T Recommendation G.811
ITU-T Recommendation G.812
Separate performance characteristics of the encoding side and decoding side of the PCM channel for four-wire interfaces Synchronous digital series basic Characteristics of quasi-master time source Characteristics of slave clock source of synchronous digital series Control of jitter and drift in digital networks based on synchronous digital series ITU-T Recommendation G.825
3 Requirements
3.1 Product specifications
Product specifications should be formulated based on this specification. Individual technical requirements and special requirements for equipment can be specified in the product specifications related to the equipment. If the requirements of this specification are inconsistent with those of the product specifications, the product specifications shall prevail. 3.2 Qualification appraisal
Equipment submitted in accordance with this specification should be a product that has been qualified or approved for finalization. .
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3.3 System composition and equipment type
3.3.1 SDH system composition|| tt||a) The SDH system model consists of SDH optical cable connection equipment and optical cable line sections (field optical cables) of STM-N (N: 1, 2, 4, with rates of 155Mbit/s, 622Mbit/s, and 2.5Gbit/s, respectively), end-to-end, as shown in Figure 1. Branch
Connection equipment
S: Send reference point, R: Receive reference point. Field optical cable
Figure 1 Block diagram of SDH system composition
Connection equipment
The line optical interface of the SDH system shall comply with the requirements of Table 1. The branch interface configuration shall comply with the requirements of the product specifications or contracts and can be combined in any form. The line system shall be able to change the branch interface without interrupting the service and will not affect the existing service. b) SDH equipment type: The equipment in the SDH optical line system can be divided into terminal multiplexers (TM) and add/drop multiplexers (ADM), as shown in Figures 2 and 3.
2MbiVs
34Mbit/s
140Mbit/s
155Mbit/s
(optical)
155Mbis
Interfacing equipment
Figure 2 SDH terminal multiplexer (TM)
STM-N (optical port)
3.3.2 PDH system composition and equipment types||t t||Mbit/s
Connection equipment
(electrical)
Mbit/s
(optical)
STM-N (optical port)
STM-N (optical port)
Figure 3 SDH add/drop multiplexer (ADM)
The PDH system consists of PDH optical cable connection equipment and field optical cable line sections (field optical cables), and the equipment types are shown in Figure 4. 2
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Connection equipment
B/S/GEI pipe FC number
3.4 Performance characteristics
Connection service data
3.4.1 Equipment performance requirements
Field optical cable
Connection equipment
Digital FC
Data connection
口口口
Figure 4 PDH optical terminal constitutes end-to-end system and type FR
Nominal wavelength of light source: (1480~1580) m can be selected im or (1280~1335)mm Light source type: single mode LD (laser diode) Optical receiver type: PIN+FET
Fiber type: ITU-TG.652 should be selected
SDH line rate: 155520kbit/s622080kbit/s, 2488320kbit/s; PDH line rate: 42240kbit/s
Line transmission code type: NRZ+scrambling:
Error performance: should comply with 3.4.2.3: Jitter performance! Should comply with 3.4.2.4
Fiber connector type: FC/PC (preferred without special circumstances) 3.4.2 Technical performance indicators
3.4.2.1 Optical interface indicators
SDH optical interface indicators, see Table 1.
Table 1 SDH optical interface indicators
Nominal bit rate
Application code
Working wavelength range
Light source type
Maximum -20dB spectrum width
Minimum side mode suppression ratio
Maximum average transmit power
Minimum average transmit power
Minimum extinction ratio
Attenuation range
Maximum dispersion
Minimum return loss of optical cable at point S
Maximum dispersion between SR points
Reflection coefficient
155520(STM-1)
622080 (SIM-4Y
1-412142
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2488320(STM-16)
1280-13351480158018013351480-1580128013351500-1580SLM
1200~1600
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Worst sensitivity
Minimum overload point||tt| |Maximum optical channel cost
Maximum reflection between R points
Table 1 (continued)
Note: "" indicates that it is to be studied internationally, and "_" indicates "not required". PDH optical interface indicators:
Output optical power Po: ≥-5dBm;
2) Optical receiving sensitivity P: ≤-40dBm (measured when BER≤1x10-1° at 2Mbit/s interface); Optical receiving dynamic range: ≥35dB (measured when BER≤1×10-10 at 2Mbit/s interface). 3)
3.4.2.2 Electrical interfacewwW.bzxz.Net
Electrical interface parameters
Should comply with ITU-T
ITU-T recommendations
Nominal rate
Rate offset tolerance
Interface code type
Peak voltage/impedance
Nominal pulse width
Input signal attenuation
Electrical connector type
G.703 interface specifications, see Table 2.
Table 2 Electrical interface parameters
2M electrical interface
2048kbit/s
±50×10
2.37V/750 unbalanced
0~6dB/1MHz
SDH synchronous clock output and input interface
34M electrical interface
140M electrical interface
Complies with ITU -TG.703 specification
34368kbit/s
±20×10%
1V/750 unbalanced
0~12dB/17MHz
139264kbit/s
±15×10
1V175 unbalanced
3.59/7.18ns
0~12 dB/70 MHz
L9-75 universal electrical connector
2048kHz synchronous clock output interface See Table 3 Table 3 Synchronous clock output interface parameters
Line pair type
Test load impedance
Maximum peak voltage (Vo)
Minimum peak voltage (Vop)
2048kHz synchronous clock input interface:
Reflection loss at 2048KHz or 2048kbit/s: ≥15dB. Field group line interface (only for PDH optical terminal) 1) B interface (AMI code) shall comply with the provisions of GJB3437-98: -rKAoNiKAca
155M electrical interface
155520kbit/s
±20×10-
1V/750 unbalanced
3.215/6.43ns
0~12.7dB/78MHZ
(2048±50×10)KHz
Coaxial line pair
750, resistive
2) S interface (FC interface) shall comply with the provisions of GJB3437-98: 3) G interface (EOW engineering service interface) shall comply with the provisions of GJB3437-98. SJ20860-2003
Electrical connector type: adopt the Y50EX-1210ZK14 universal fast electric connector that complies with the GJB3437 standard. Network management and monitoring interface
SDH equipment should have two network management interface modes 1) TMN interface
SDH equipment should at least provide a Q interface to connect to the TMN. The Q interface between the network unit management system within the station adopts the CLNS1 connectionless mode protocol stack specified by ITU-T recommendations Q.811 and Q.812; the Q interface between the remote network unit management system adopts the CLNS2 connectionless mode protocol stack. 2) Workstation interface
The terminal station equipment should be equipped with a communication interface with the workstation, and the interface characteristics should comply with the requirements of the F interface. The handheld terminal monitoring interface
Complies with the requirements of the RS-232 (or RS-422) asynchronous data operation interface specification. Electrical connector type: Use the universal fast electrical connector Y50EX-1210ZK14 that complies with the GJB3437-98 standard. The service telephone audio interface
should comply with the four-wire audio interface indicators specified in ITU-TG.714. Electrical connector type: Use the universal fast electrical connector Y50EX-1210ZK14 that complies with the GJB3437-98 standard. Error performance
The error performance indicators of SDH optical interface at different rates are shown in Table 4. Table 4 Error performance of SDH optical interface
155520
2.75×10-7
Note: "*" indicates that it is under study internationally.
The error performance of the electrical interface of the equipment is shown in Table 5.
kbit/s
155520
139624
128/256/512/1024/2048 (B interface) 3.4.2.4 Jitter performance
Maximum allowable output jitter of the electrical interface, see Table 6a)
kbit/s
622080
2.75×10-6
1.375×10-7
Bit error performance of the electrical interface
T/Bit error rate (BER)
≤1×10-12
≤1×10-
≤1×10-10
≤1×10-9
2 488320
1.375×10-7
23-1 pseudo-random code
Test is not less than 24h
223-1 pseudo-random code
Test is not less than 24h
215-1 pseudo-random code
Test is not less than 24h
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kbit/s
139264
155520
Table 6 Maximum allowable output jitter of electrical interface
Network interface limit
Jitter tolerance of input port
Should meet the input jitter tolerance recommended by ITU-TG.825, as shown in Figure 5 and Table 7. u
Measurement filter parameters
Figure 5 Schematic diagram of recommended template for input jitter drift tolerance Table 7 Input jitter tolerance
Kbit/s
139 264
155520
Jitter transfer characteristic
Interface limit
SDH jitter transfer characteristic should be less than 0.1dB. Hz
PDH (2048kbit/s interface) jitter transfer characteristic should be less than 1dB. 3.4.2.5 Basic frame structure
a) Basic frame structure of SDH equipment
Test filter parameters
The frame structure of SDH equipment consists of one or more synchronous transport modules (STM-N) of different orders. N is 1, 4, or 16 as shown in Figure 6.
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9XN columns (bytes)
Section overhead
Management unit pointer
(AUPTR)
Section overhead
STM-N frame consists of three areas, namely
1) Section overhead (SOH)
270XN columns (bytes)
261XN columns (bytes)
STM-N net load
(Payload)
2) Management unit pointer (AUPTR):
3) Net load (Payload):
Basic frame structure of SDH equipment
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125μs
STM-N can be expressed as a two-dimensional block frame structure. There are 270 x N columns vertically and 9 rows horizontally! A total of 2430 x N bytes (each word is 8 bits). The frame repetition period is 125 μs. During transmission, bytes are transmitted serially from left to right and from top to bottom row by row.
Basic multiplexing frame structure of PDH equipment
The basic multiplexing frame structure of PDH equipment is specified by the PDH product specification. 3.4.2.6 Basic multiplexing structure of SDH steps
Figure 7 specifies the multiplexing structure of PDH signal multiplexing and mapping into SDH (STM-N) basic frame, XN
VC-A TUGFO
Pointer processing
Multiplexing, mapping
-positioning calibration
3.4.2.7 SDH timing signal mode
Figure 7 SDH basic multiplexing mapping structure
SDH equipment should have three timing modes:
and comply with ITU-T
G.707 recommendation.
139264kbit/s
34368kbius
2048kbit/s
a) External synchronous clock source (2048kHz synchronous clock input or 2048kbit/s synchronous clock input), preferably 2048kbit/s: b)
Recover timing from STM-N signal:
Internal timing source, the maximum frequency deviation is 4.6×10~6. SJ208602003
3.4.2.8 Power supply
AC power supply voltage: 220+22V, frequency: (50±3)Hz; DC power supply voltage: 24+V.
The equipment can be powered by AC and DC at the same time, and can switch automatically without affecting the working performance. 3.4.2.9 Power consumption
Specified by the product specification.
3.4.2.10 Auxiliary function characteristics
3.4.2.10.1 Alarm
When the input optical signal or electrical signal is lost or the equipment itself fails, the equipment shall generate an audible and visual alarm and have an alarm cut-off switch to clear the alarm ringing tone.
3.4.2.10.2 Service contact communication
SDH equipment shall be able to provide at least one audio full-duplex PCM encoding/decoding channel and have a two-wire/four-wire audio interface and group calling function a)
b)PDH equipment shall be able to provide one audio full-duplex PCM encoding/decoding channel and have a four-wire audio interface and group calling function. 3.4.2.10.3 Control and management functions
SDH control and management functions
When there are no special requirements for SDH access equipment, it should have the following control and management functions: Fault management
Alarm function: Identify its own fault alarm, locate the fault, and operate the alarm switch to eliminate the alarm: Monitoring parameters: Send signal status, input signal loss (LOS), LD bias current, frame loss (LOF), out-of-sync (OOF), errored seconds (ES), severely errored seconds (SES) and unavailable time: External clock alarm report: It should be able to collect alarms related to the terminal and report them. 2)
Performance management
Error performance: The error performance parameters should be automatically collected and analyzed, and can be transmitted to external equipment in the form of ASCI code intervals: Performance monitoring: The performance monitoring threshold can be set; Loopback test: It can support near-end or far-end loopback test functions, etc. Configuration management
Modify configuration: The set parameters can be re-modified configuration: Call configuration: It can support channel cross-connection and flexible configuration; Select configuration: It can support the selection of timing source priority. Security management
Authorization management: No unauthorized access to the management system is allowed, and only the corresponding part can be accessed with limited authorization: Monitoring management: It should be able to monitor and implement control on all applications that attempt to access restricted resources. b) PDH connection equipment control and management function Alarm function: Input 2Mbit/s loss, optical loss, frame loss, BER≥10-6 indication, AIS detection; Error count query: Error count range 0~15; Group status query: Group signal input loss, 2Mbit/s loss, group signal rate: 2Mbit/s Branch status query: Whether there is "AIS" and "2Mbit/s input loss" alarm, etc.; Branch settings: 2Mbit/s internal self-loop, self-loop cancellation, interleaving connection, etc. settings: Save settings and default settings: The current settings can be saved in the memory or the current settings can be cleared. 3.5 Reliability
3.5.1 Reliability design
Should comply with the provisions of 3.5.2.5 in GJB367A-2001.3 Control and management functions
SDH control and management functions
When there are no special requirements for SDH access equipment, it should have the following control and management functions: Fault management
Alarm function: Identify its own fault alarm, locate the fault, and operate the alarm switch to eliminate the alarm: Monitoring parameters: Send signal status, input signal loss (LOS), LD bias current, frame loss (LOF), out-of-sync (OOF), errored seconds (ES), severely errored seconds (SES) and unavailable time: External clock alarm report: It should be able to collect alarms related to the terminal and report them. 2)
Performance management
Error performance: The error performance parameters should be automatically collected and analyzed, and can be transmitted to external equipment in the form of ASCI code intervals: Performance monitoring: The performance monitoring threshold can be set; Loopback test: It can support near-end or far-end loopback test functions, etc. Configuration management
Modify configuration: The set parameters can be re-modified configuration: Call configuration: It can support channel cross-connection and flexible configuration; Select configuration: It can support the selection of timing source priority. Security management
Authorization management: No unauthorized access to the management system is allowed, and only the corresponding part can be accessed with limited authorization: Monitoring management: It should be able to monitor and implement control on all applications that attempt to access restricted resources. b) PDH connection equipment control and management function Alarm function: Input 2Mbit/s loss, optical loss, frame loss, BER≥10-6 indication, AIS detection; Error count query: Error count range 0~15; Group status query: Group signal input loss, 2Mbit/s loss, group signal rate: 2Mbit/s Branch status query: Whether there is "AIS" and "2Mbit/s input loss" alarm, etc.; Branch settings: 2Mbit/s internal self-loop, self-loop cancellation, interleaving connection, etc. settings: Save settings and default settings: The current settings can be saved in the memory or the current settings can be cleared. 3.5 Reliability
3.5.1 Reliability design
Should comply with the provisions of 3.5.2.5 in GJB367A-2001.3 Control and management functions
SDH control and management functions
When there are no special requirements for SDH access equipment, it should have the following control and management functions: Fault management
Alarm function: Identify its own fault alarm, locate the fault, and operate the alarm switch to eliminate the alarm: Monitoring parameters: Send signal status, input signal loss (LOS), LD bias current, frame loss (LOF), out-of-sync (OOF), errored seconds (ES), severely errored seconds (SES) and unavailable time: External clock alarm report: It should be able to collect alarms related to the terminal and report them. 2)
Performance management
Error performance: The error performance parameters should be automatically collected and analyzed, and can be transmitted to external equipment in the form of ASCI code intervals: Performance monitoring: The performance monitoring threshold can be set; Loopback test: It can support near-end or far-end loopback test functions, etc. Configuration management
Modify configuration: The set parameters can be re-modified configuration: Call configuration: It can support channel cross-connection and flexible configuration; Select configuration: It can support the selection of timing source priority. Security management
Authorization management: No unauthorized access to the management system is allowed, and only the corresponding part can be accessed with limited authorization: Monitoring management: It should be able to monitor and implement control on all applications that attempt to access restricted resources. b) PDH connection equipment control and management function Alarm function: Input 2Mbit/s loss, optical loss, frame loss, BER≥10-6 indication, AIS detection; Error count query: Error count range 0~15; Group status query: Group signal input loss, 2Mbit/s loss, group signal rate: 2Mbit/s Branch status query: Whether there is "AIS" and "2Mbit/s input loss" alarm, etc.; Branch settings: 2Mbit/s internal self-loop, self-loop cancellation, interleaving connection, etc. settings: Save settings and default settings: The current settings can be saved in the memory or the current settings can be cleared. 3.5 Reliability
3.5.1 Reliability design
Should comply with the provisions of 3.5.2.5 in GJB367A-2001.
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