1. Summary
This product is the fundamental device for the digital communication system, which is also named PCM basic group device.

It is used to multiplex the signals such as voice, data & image into a standard 2M interface via various interface cards, realizing point-to-point transmission.
2. Functional Features
a) provide 30 channels of optional subscribers interfaces of various types to facilitate the access of various services;
b) The voice interface supports caller ID display;
c) CCB payphone application with polarity reversal;
d) It directly provides 2M channel for transmission;
e) Perfect indications of status are available to facilitate maintenance and management;
f) With small size, attractive appearance, and easy for installation and operation.
3. Working Conditions
Working Temperature: 0℃ ~ 40℃
Relative Humidity: ≤ 90% (25℃)

4. Power Supply
Input Voltage: -48V
Acceptable dynamic Voltage: -36V ~ -72V
Input Current: < 1A

5. Subscriber Interface Modules (optional)
Ø FXO
Ø FXS
Ø 2 wire audio interface/2 wire E&M
Ø 4 wire audio interface/4 wire E&M
Ø RS232/V.24 asynchronous data interface
Ø RS232 synchronous data interface
Ø RS422 data interface
Ø RS485 data interface
Ø Hot-line phone interface
Ø Magnet telephone interface
Ø V.35 interface (n*64K bandwidth)
Ø V.21/V.22 interface
Ø 10/100Base_T Ethernet interface(n*64K bandwidth)
Ø G.703 64Kb/s co-directional data interface

NOTES: The above subscriber interface modules can be optional for installation based on actual need of user. This device provides max 30 slots for your optional modules. 6. Technical Parameters

☆ G.703-E1 Interface Confoms to the recommendation of ITU G.703/G.704; Nominal Bit Rate: 2048kbit/s Bit Rate Fault Tolerant: +102.4bit E1 Line Code: HDB3 Impedance: 75Ω or 120Ω	☆ Subscriber Interface(FXS) Impedance: 600Ω Insertion Loss: -3±0.75dB Frequency Characteristic: 300～3400Hz(-0.6～+3dB) Weighted Noise: ≤63.7dBmop Crosstalk Attenuation: ≥65dB Loop Impedance: ≤1800Ω
☆ Subscriber Interface(FXO) Impedance: 600Ω Insertion Loss: -3±0.75dB Frequency Characteristic: 300～3400Hz(-0.6～+3dB) Weighted Noise: ≤63.7dBmop Crosstalk Attenuation: ≥65dB Loop Impedance: ≤1800Ω	☆ V.24/RS232 Interface Data and clock level conform to the recommendation of V.28 Synchronous Data Rate: 64Kbps Asynchronous Data Rate : 0～19200bps
☆ 2/4 wire Audio Interface Coding mode: ITU-T G.711A Frequency Range: 300～3400Hz 2 wire Input Relative Level: 0～ -5dBr Output Relative Level: -2～ -7dBr 4 wire Input Relative Level: -14dBr Output Relative Level: +4dBr	☆ V.35 Interface type: V.35 synchronous Rate: Nx64Kb/s(N =1～30) Clock: DCE
☆ Ethernet interface Compatible with IEEE802.3 Rate of Local Area Network Interface: 10/100Base_T Rate of Wide area network interface: n×64k (n=1－30)Support simp