This product is the fundamental device for the digital communication system, which is also named PCM basic group device with optical link interface.

The device is used to collect the signals such as voice, data and image into a optical link by various interface cards, realizing point-to-point transmission.

*It provides 30 channels of optional subscribers interfaces of various types to facilitate the access of various services;
*The voice interface supports caller ID display;
*CCB payphone application with polarity reversal;
*optical link interface is provided for reliable transmission of data;
*It provides one 10Base_T interface with bit rate of 10Mbps.
*Perfect indications of status are available to facilitate maintenance and management
*With small size, attractive appearance, and easy for installation and operation.

Optical Fiber Interface
Bit Rate:16.384Mb/s±50ppm
Code Type:NRZ + scrambling code
Transmitting Optical Power:> -5dB(long distance)or > -12dB(short distance)
Receiving Sensitivity:> -36dB
Connector:FC, SC or single optic interface

Subscriber and Loop Interface
Impedance:600Ω
Insertion Loss:-3 ± 0.75dB
Frequency Characteristic:300 ~ 3400Hz (-0.6 ~ +3dB)
Weighted Noise:≤ -63.7dBmop
Crosstalk Loss:≥ 65dB
Loop Impedance:≤ 1800Ω

2/4-wire audio interface (2/4-wire E&M interface)
Impedance:600Ω
4-wire AD gain:14dB (adjustable)
4-wire DA gain:-2 dB (adjustable)
4-wire AD frequency characteristic:-0.2 - +0.2dB
4-wire DA frequency characteristic:-0.2 - +0.2dB
2-wire AD frequency characteristic:-0.2 - +0.2dB
4-wire DA frequency characteristic:-0.2 - +0.2dB (adjustable)
Return Loss:40dB
Balance Degree:70dB
Common Mode Rejection Ratio(CMRR):70dB
Power Supply Rejection Ratio:30dB
Spare Signal Channel Noise:≥ 65dB

RS232(asynchronous) interface
Interface Type:V.24 asynchronous
Rate:0 ~ 19.2Kbps

RS232(synchronous) interface
Interface Type:synchronous RS232(simplex and full duplex are optional)
Rate:4800bps, 9600bps or 19200bps
Clock Mode:optional DCE and DTE

V.35 interface
Interface type:V.35 synchronous
Rate:Nx64Kb/s(N =1~30)
Clock Mode:DCE

10Base_T interface
Interface Type:10Base-T
Interface Rate:10Mbps
Transmission Rate:Nx64Kb/s(N = 1~30)
Protocol:link layer bridging