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Module Descriptions, RFL 9508D Digital Section
8.1
CM4 COMMON MODULE
The CM4 Common Module is a microprocessor-controlled module that performs all of the T1/E1
multiplexing, demultiplexing and user interface functions in the 9508D. In most applications, each
9508D terminal contains one CM4 Common Module located in slot 10, while in drop/insert
applications the 9508D contains two CM4 Common Modules, one in slot 10 and one in slot 1.
8.1.1
CM4 OPERATIONAL FUNCTIONS
The CM4 is the standard T1/E1 Common Module for the RFL 9508D Terminal, and provides the
following operational functions.
1. T1/E1 line receiver (input)
2. T1/E1 line driver (output)
3. Demultiplexing of the T1/E1 aggregate to individual channels
4. Multiplexing of channels to form T1/E1 aggregate
5. Multiplexer/demultiplexer bus interface to channels.
6. Transmit timing functions.
7. Loopback configurations.
8. Microprocessor control
9. User interface.
10. Sequence of events
11. Time and Date Settings
12. Download function
13. NCM Module Adapter
RFL 9508D UCC
RFL Electronics Inc.
March 11, 2010
8-3
(973) 334-3100