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2-2 Dedicated EIA RS-232 Networks
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to the channel will retry automatically.
Normally both RS-232 channels are required for networking. If only one channel is used, the other channel
can be used for the AUDIX Call Detail Recording (CDR) feature. However, this configuration is only
appropriate for networks with low traffic volume. If a customer chooses to use a channel for CDR, AT&T
recommends running CDR only during non-peak hours, thereby leaving two ports available for networking
during peak hours. See Figure 2-2, Dedicated RS-232 Network of Two AUDIX Systems and a PC (Low
Traffic Only). A switched RS-232 configuration is always preferable for networks that do not have very
low traffic.
If another system must be added to Figure 2-1, this can be done as shown in Figure 2-3, Dedicated RS-232
Network of Three AUDIX Systems (Low Traffic Only). If a PC is required in this case, at least one channel
from each system must be converted to a switched connection. See Figure 2-4, Dedicated RS-232 Network
of Three AUDIX Systems and a PC. Instead of switching cables as with configurations such as Figure 2-2,
the PC has dial-up access to any AUDIX system in the network. There is more information on switched
connections in the next section.
NOTE
Text Services and/or Call Detail Recording can be added using the DCP channels. See
Chapter 4, DCP Mode 1 Networks — 56 Kbps, and Chapter 7, Mixtures of RS-232 and DCP
Networks.
When there are more systems and/or PCs than channels, contention for the channels may occur. This
situation can usually be avoided, however, by scheduling the transfer of data at different times of the day.
See Chapter 13, AUDIX System Administration for details on how to set up transmission schedules. Even
when contention does occur, an AUDIX system will try to establish a connection two more times. If still
unable to make the connection, the AUDIX system will try again at the next scheduled interval or when the
transmission queue becomes full.
H600-330
GROUP 1
(TWO SHOWN)
H600-331
GROUP 2
H600-331
GROUP 2
AUDIX
AUDIX
SWITCH
RS-232
RS-232
Figure 2-1. Dedicated RS-232 Network of Two AUDIX Systems