Demand test descriptions and error codes - Avaya Support

Figure 46: Typical Modem Pool Switched Connection with Integrated Pooled Modem
TERMINAL
TELEPHONE
NETWORK
MODEM
HOST
COMPUTER
DATA MODULE
ANALOG
Combined Modem Pools
DCP
TIP/RING
ANALOG
POOLED MODEM
CONVERSION
RESOURCE
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.
DIGITAL
PORT
668 Maintenance Alarms for Communication Manager, Media Gateways and Servers
DIGITAL
LINE
(TN754)
(TN758)
CENTRAL OFFICE
TRUNK
(TN747B)
ANALOG
PORT
DCP
DCP
PCM
PCM
PBX
DIGITAL
NETWORK