الوصف

Service Boards
MCT board: providing double E1 interface,
support *5&branded; or **0&branded;. Double E1 interface
are designed for the networks add/drop
multiplexing requiring.
l PWR board: **8V DC, ring current is optional.
If need **0V AC, can add one switching
power supply.
Audio Service Board:
l LE board: providing 4 channels FXO interface
l HOT board: providing 4 channels FXS interface, support hotline mode.
l 2/4W board: providing 4 channels 2/4 wire E/M interface, support E/M signaling.
l MS board: providing 4 channels magneto interface.
Data Service Board:
l V.*5 board: providing 2 channels V.*5 synchronous data interface with a rate of NX*4K up to maximum of 1.**4Mb/s.
l V.*4 board: providing 4 channels V.*4 sync/async data interface, with rate of 2.4k, 4.8k, 9.6k, *9.2k, *8.4k and *4kb/s, sub-rate X.*0 multiplexering or direct sampling, simultaneity adapt connect to DTE or DCE
l G.**3 board: providing 4 channels G.**3 *4K synchronous data interface.
l X.*0 board: providing 5 channels X.*0 interface.
l UIF board: providing 2 channels U interface (ISDN 2B+D), data transmission rate up to **8K.
l Ethernet board: providing 1 channel *0/**0 Base-T Ethernet bridge, support VLAN.
l E1 board: providing 2 or 4 channels E1 interface, do not support trunk function.
Remark: MCT and Power board is essential, other audio and data service board is optional. Support maximum *1 pieces of service board.
Specification
E1 Interface:
² Standard rate: 2.**8Mb/s±*0ppm.
² Interface type:
A. *5&branded; unbalanced, HDB3 code.
B. **0&branded; balanced, HDB3 code.
l Audio Interface:
² Impedance: **0&branded;.
² A rule condensed coding.
² Audio modulation range:
A. Audio *-wire: receiving signal level 0
dBr～*7.5dBr, sending signal level 0
dBr～*7.5dBr
B. Audio *-wire: receiving signal level *2
dBr～**3dBr, sending signal level *1
dBr～**4dBr.
Data Interface:
² V.*4 data interface, rate below *4kb/s,
synchronous or asynchronous, X.*0
multiplexing
² G.**3 *4kb/s synchronous data interface
² V.*5 synchronous interface, rate is N´
*4kb/s, maximum is up to 1.**4Mb/s
² Data line ISDN-U interface, rate is **8kb/s
² *0Base-T Ethernet interface, rate is
*0/**0Mb/s