AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 228

Data Communications Support
DHGs support the following:
modem pools
dedicated lines for data service (for example, DHG #4 in Figure 5-1)
a host computer with multiple ports
a workstation (gateway) on a LAN
NOTE:
One important aspect of a modem pool is the specific direction of call
origination. All the units (for example, modems) on one side of the modem
pool can be grouped into a DHG, so users only need to dial one number for
any pair.
Figure 5-1 shows the following examples of DHG assignments for the various
shared resources:
DHG #5 is assigned to the data modules used to communicate with the
local host computer
DHG #6 is assigned to the modems used to communicate with the local
host computer
DHG #7 is assigned to the 7500B Data Modules used to communicate
with the workstation (gateway) on a LAN
DHG#8 is assigned to the modems used to communicate with the
workstation (gateway) on a LAN
The communications system accommodates up to 32 calling groups (or DCG).
Each calling group can have a maximum of
a member of only one calling group.
Modem Pool
A modem pool acts as a conversion resource to accommodate communication
between analog and digital data endpoints. The modem pool can be one or
more pairs of DCEs; a pair consists of one 7500B Data Module connected via
an RS-232 interface to a modem.
NOTE:
It is possible for a communications system user to unintentionally or
inadvertently corrupt the modem or 7500B Data Module settings by
changing options at the modem/7500B Data Module interface. If a problem
occurs with a modem pool, the settings on each device should be checked.
5-1o Data Communications Configuration Overview
20
members. A data station can be