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Pooled Modem (TN758)
The Pooled Modem Circuit Pack supports 0-300 and 1200 bits per second (bps) data speeds
and provides the following:
● Circuitry to provide a signal compatible with the modulation formats of the 212-
series modems
● Modem emulation (see below)
Capability
Data Module Mode
0-300 Asynchronous
Low
300 Asynchronous
300 Asynchronous
1200 Asynchronous
1200 Asynchronous
● Modem control functions corresponding to 212A-series modem operations.
A maximum of two Pooled Modem CPs are allowed in a single cabinet (six in a 3-cabinet
system).
The Pooled Modem CP (Figure 3-21) consists of common circuitry and two conversion
resources. The conversion resource (port) allows communications between two dissimilar
endpoints. For example, the Pooled Modem CP enables a digital data endpoint linked to an
ADU connected to a port on the Data Line CP (TN726) to communicate with either a local
analog data endpoint, such as a personal computer with a modem, or a remote host via a CO
trunk connection.
Each port has two connections to the TDM bus: one to the digital data
endpoint via an ADU data module, and the other to an analog endpoint.
● NPE
●
CONVERSION
❘
TDM
BUS
LEADS
CIRCUIT
PACK
ADDRESS
LEADS
RESOURCE
❘
BUS
BUFFERS
0
❘
RAM
❘
ON-BOARD
SAKI
❘
●
MICRO-
●
PROCESSOR
❘
RED
LEDS
GREEN
CONVERSION
RESOURCE
1
YELLOW
Figure 3-21. Pooled Modem (TN758) Circuit
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