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. Scope of Applications This PCM multiplexer is suitable for applications with E1 link for telecommunications end point stations or point to point transmission, such as SDH network,PDH optical terminals, microwave telecommunications, wireless spread spectrum, transmission equipments with copper wire,E1 converter in the lines of power stations,mines, government agencies, the military, airports, police department,express highway, banks and taxation systems,etc.