AT&T Release 2.0 Manuel D’Utilisation

Connecting Data Equipment

Auto-dial

off

off

Busy out

off

off

Datarest

on

off

D T R

follow

follow

Duplex

full

full

Mode

cs

c s

Speed

56,000

64,000

If the customer’s system is running at 56 kbps, set

A call between an analog data station and a digital data station is possible
only if the system includes a modem pool to convert the signals back and

forth between analog and digital. A modem pool consists of one or more
modem-and-data module pairs; two pairs are shown in Figure 6-8.

Modem pools are set up as analog-to-digital or digital-to-analog:

■     

Digital-to-Analog: This type of modem pool is used when a call to an

analog data station is originated from a digital station.

■     

Analog-to-Digital: This type of modem pool is used when a call to a

digital data station is originated from an analog data station.

Modem Pools