AT&T AT&T manual Pooled Modem TN758, Capability Data Module Mode

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.

TDM

BUS

LEADS

CIRCUIT PACK ADDRESS LEADS

❘ ●

❘BUS BUFFERS

❘

❘
❘	S A K I
❘

RED

LEDS GREEN

YELLOW

N P E

R A M

ON-BOARD

●MICRO- PROCESSOR

●

●

CONVERSION RESOURCE 0

CONVERSION

RESOURCE 1

Figure 3-21. Pooled Modem (TN758) Circuit

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