Avaya Definity SI, Maintenance Manual, Page: 1883 / 2968

MODEM-PT (Modem Pool Port)
Issue 4 May 2002 10-1097 555-233-123
Refer to Figure 10-69 on page 10-1098 while reading the following
paragraph.
Each Modem Pool conversion resource contains two ports. One of these, an
Analog Line Port, is connected (via the PBX network) to the Analog Line or
Central Office Trunk Port that is the source of the modem signal. The second port
is referred to as the digital port and is connected (again through the PBX network)
to the Digital Line or Trunk port associated with the Data Module in the
connection. The analog modem signals enter the analog port of the conversion
resource in standard Pulse Code Modulation (PCM) format but are converted into
Data Communications Protocol (DCP) format before going to the Digital Line or
trunk in the connection.
There are two primary types of Modem Pool conversion resources available: an
Integrated Pooled Modem and a Combined Modem Pool. The integrated TN758
Pooled Modem circuit pack contains two independent 300 or 1200 baud
conversion resources. Each conversion resource contains two interfaces to the
PBX digital network: an analog port and a digital port. The analog port is
connected through the PBX network to the analog line or trunk port containing the
analog modem signals. The digital port connects through the PBX network to the
digital line or trunk port in the call.
Figure 10-69 shows a typical end-to-end
connection using a conversion resource on the integrated Pooled Modem circuit
pack.