| Typical Networking Application:
Main Characteristics:
High density single-board design can improve the reliable performance of system
Providing optional reverse-polar signal is convenient for the subscriber’s precise charging
Provide 1~30 voice interfaces, customize according to requirements
Centralized network management is convenient for the subscriber’s maintenance and management
1U-height 19-inch chassis structure can reduce the space occupied in equipment room
Main Technical Indexes:
E1 interface
Standard E1 interface conforms to ITU-T G.703 and G.704 suggestion:
a） Bit rate ：2048Kbps±50ppm
b） Code ：HDB3
c） Interface impedance ：75Ω
d) Interface characteristics: meet G.703, G.742 and G.823 standards
e) Frame structure: non-frame structure
Subscriber and Loop Interface:
Voice interface: speech channel characteristics conform to General Technical Specifications of Telephone Exchange Equipment of Ministry of Post and Telecom
a) Impedance ：600Ω
b) Insertion loss ：-3±0.75dB
c) Frequency characteristics ：300～3400Hz(-0.6～+3dB)
d) Balanced weight noise ：≤63.7dBmop
e) Crosstalk attenuation ：≥65dB
f) Subscriber line loop resistance: less than 3KΩ (including telephone)
g) Feed voltage ：48V；
h) Feed voltage ：20~50mA；
i) Ringing current ：AC90 plus or minus 15V
2/4-wire interface:
a) Compression ratio: ITU-T G.711A-law
b) Impedance: balance 600Ω
c) Frequency range :300～ 3400Hz
d) 2-wire input relative level :0～ -5dBr
e) Output relative level :-2～ -7dBr
f) 4-wire input relative level :-14dBr
g) Output relative level :+4dBr
h) Return loss: not less than 20dB
External dimensions:
External dimensions for 19-inch 1U box: 438×215×45mm
Power supply
Input:-48V（±20%）or 220V AC
Output:±5V（±5%） Ringing current 75VAC
Power :≦7W（full capacity）
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