Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
2.3.3 E1 COMMON MODULES
The E1 Common Module (CM4) is a microprocessor-controlled module that performs all of the E1
multiplexing and demultiplexing functions. It also provides the user interface, and may optionally
provide other functions, such as an additional timing source. In non-redundant applications, each
IMUX 2000 terminal multiplexer contains one CM4 Common Module, while a drop/insert multiplexer
contains two CM4 Common Modules. In redundant applications, each IMUX 2000 terminal
multiplexer contains two CM4 Common Modules, while a drop/insert multiplexer contains four CM4
Common Modules.
The CM4 is the standard E1 Common Module for the IMUX 2000. It provides the following sixteen
operational functions:
CM4 Operational Functions
See Paragraph
1. E1 line receiver (input). 2.3.3.1
2. E1 line driver (output). 2.3.3.2
3. Demultiplexing of the E1 aggregate to individual channels. 2.3.3.3
4. Multiplexing of channels to form E1 aggregate. 2.3.3.4
5. Multiplexer/demultiplexer bus interface to channels. 2.3.3.5
6. Transmit timing functions. 2.3.3.6
7. Loopback configurations. 2.3.3.7
8. Microprocessor control 2.3.3.8
9. User interface. 2.3.3.9
10. Fast reframing channel. 2.3.3.10
11. Sequence of events 2.3.3.11
12. Time and Date Settings 2.3.3.12
13. Download function 2.3.3.13
14. Redundant protection mode Section 3
15. Network Management Communications (NMS) Section 6
IMUX 2000E1 RFL Electronics Inc.
April 1, 2007 2-10 (973) 334-3100
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