DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1079MODEM-PT (Modem Pool Port)
9
MODEM-PT (Modem Pool Port)
The Modem Pool Port provides an interface for d igital and analog d ata
communication devic es or ports connected to the PBX. It may be thought of as a
PBX data communic ations ‘‘conversion resource’’ becau se it converts analog
modem signals typic ally used in the telephone network into d igital signals that
are compatible with the inter nal PBX network and vice versa.
There may be a number of these conversion resources availab le in the PBX, each
assigned to an available M odem Pool Group. Only one conversion resource i s
used per data c onnection. The PBX software usually adds the conversion
resource into a data connec tion if it determines that it is necessar y for the call.
Typical connections that includ e Modem Pool conversion resources includ e data
calls from Analog Line or Central Office Trunk ports to any d igital port or Digital
Line or Trunk ports to any analog port. An examp le of a Data Module to Central
Office Trunk connection using a Modem Pool c onversion resource is shown in
Figur e 9-62 . In the case where a local data call originates from an analog p ort
normally used for voice servic e only and terminates on a dig ital port, a Data
Origination access c ode must be dialed before the extension number for the
Modem Pool conversion resource to be included in the connection.
Each Modem Pool conversion resource c ontains two ports. One of these, an
analog port, is connec ted (via the PBX network) to the analog line or trunk p ort
that is the source of the modem sig nal. The second port is referred to as the
digital port an d is connected (aga in thr o ugh the PBX networ k) to the digital line or
trunk port associated wi th the Data Module in the connection. The analog
modem signals enter the analog port of the conversion resource in st andard
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.

Integrated Modem Pools

There are two primary types of Modem Pool conver sion resources available: an
Integrated Pooled Modem an d a Combined Modem Pool. The integr ated TN758
Pooled Modem circuit p ack contains two indep endent 300 or 1200 baud
conversion resources. Each conver sion resource contains two interfaces t o the
PBX digital network: an analog port and a digital port. The analog port is
MO Name (in
Alarm Log) Alarm
Level Initial Command to Run1
1.
UU
is the universal cabinet number (1 for PPN, 2 - 44 for EPNs).
C
is the carrier designation
(A, B, C, D, or E).
SS
is the number of the slot in which the circuit pack resides (01 to 21).
pp
is the two digit port number (01, 02, ...).
Full Name of MO
MODEM-PT MINOR test port UUCSSpp s Modem Pool Port