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MODEM-PT (Modem Pool Port)
Issue 1 June 2005 1679
Figure 93: Typical Modem Pool Switched Connection with Integrated Pooled Modem
Combined Modem Pools
The Combined Modem Pool conversion resource is the second type available. The function
served by the Combined Modem Pool is similar to that of the integrated Pooled Modem circuit
pack, but the physical implementation is much different. It has the advantage of supporting any
speed the external modem can support. The integrated Pooled Modem circuit pack can only
support 300- or 1200-bps transmission rates. The Combined Modem Pool conversion resource
consists of a port on an Analog Line circuit pack, an external modem, a Data Module, and a port
on a TN754 Digital Line circuit pack. The tip and ring interface of the Analog Line is connected
to the modem, the RS-232C interface of the modem connects to the Data Module, and the DCP
interface on the Data Module is connected to the Digital Line port.
The analog modem signals pass through the Analog Line port to the modem. The modem
converts these to RS-232C signals which are passed on to the Data Module. The Data Module
further converts the signals to the DCP protocol for the Digital Line port which passes the
signals on to the PBX network.
ANALOG
ANALOG
DCP
DCP
DCP
TIP/RING
PORT
DIGITAL
PORT
(TN758)
ANALOG
CONVERSION
POOLED MODEM
DATA MODULE
COMPUTER
HOST
MODEM
NETWORK
TELEPHONE
NETWORK
DIGITAL
PBX
(TN754)
LINE
DIGITAL
(TN747B)
TRUNK
CENTRAL OFFICE
RESOURCE
TERMINAL
PCM
PCM