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2-12
Chapter 2 - Description and Installation
Peripheral Cards
DTMF Receiver Board
The DTMF is a small card mounted as a piggyback on the MISB. The DTMF Receiver card
contains 8 DTMF receivers and 8 dial tone detectors to provide additional resources to
the system when needed.
T1IB Board
The T1 Interface Board (T1IB) provides the system interface to a T1 digital CO Line with 24
channels. The T1 includes a PLL (Phase Lock Loop) circuit and two DTMF receivers. The
digital lines can be programmed as Loop, Ground, DID, E&M Wink, and E&M Immediate.
The T1 has a 15-pin DB connector (DB-15) for connection to the MPB.
Figure 2-6: DTMF Receiver Board
Figure 2-7: T1IB Board
DHS- L Gener al Descr iption
PINOUT
DHS-L
RJ-45 (CSU)
11
1
3
2
9
4
1
5
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