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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-829MODEM-PT (Modem Pool Port)
10
MODEM-PT (Modem Pool Port)
The Modem Pool Port provides an interface for digital and analog data
communication devices or ports connected to the PBX. It may be thought of as a
PBX data communications "conversion resource" because it converts analog
modem signals typically used in the telephone network into digital signals that
are compatible with the internal PBX network and vice versa.
There may be a number of these conversion resources available in the PBX,
each assigned to one of five available Modem Pool Groups. Only one conversion
resource is used per data connection. The PBX software usually adds the
conversion resource into a data connection if it determines that it is necessary for
the call. Typical connections that include Modem Pool conversion resources
include data calls from Analog Line or Central Office Trunk ports to any digital
port or Digital Line or Trunk ports to any analog port. An example of a Data
Module to Central Office Trunk connection using a Modem Pool conversion
resource is shown in Figure 10-66
. When a local data call originates from an
analog port normally used for voice service only and terminates on a digital port,
a Data Origination access code must be dialed before the extension number for
the Modem Pool conversion resource to be included in the connection.
Refer to Figure 10-66 on page 10-830
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
1. Where P is the port network number (1 for PPN and 2 or 3 for EPN); C is the carrier
designation (for example, A, B, C, D, or E); SS is the address of the slot in the carrier
where the circuit pack is located (for example, 01, 02, ..., etc.); and pp is the 2-digit
port number (for example, 01).
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
1
Full Name of MO
MODEM-PT MINOR test port PCSSpp sh Modem Pool Port