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Module Descriptions, RFL 9508D Digital Section
8.2
CM4 ELECTRICAL INTERFACE ADAPTERS
Each CM4 must be equipped with an interface adapter to connect it to the T1/E1 network. There are
two basic types of interface adapters, electrical interface adapters and optical interface adapters. This
section discusses CM4 electrical interface adapters. CM4 Optical Interface adapters are discussed in
paragraph 8.3.
Electrical interface adapters are used to connect the 9508D electrically to a T1/E1 network. There are
two types of electrical interface adapters available. These are the MA-271 and MA-278. These are also
referred to as module adapters, and are shown in Figures 8-8 and 8-9.
MA271
E1 OUT
E1 IN
EXT TMG
RS-232
6
1
5
1
9
6
Pin
Function
1
2
3
4
5
6
TIMIN-
TIMIN+
TIMOUT-
-
-
Pin
Function
1
2
3
4
5
6
7
8
9
RS232TXD
-
RS232RXD
-
GND
-
-
-
-
6-Position
Modular Jack
DB-9 Male
Figure 8-8. MA-271 panel view and pinouts
RFL 9508D UCC
RFL Electronics Inc.
March 11, 2010
8-21
(973) 334-3100