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INTRODUCTION
BACKWARD
COMPATIBILITY
SERVICE AND
TRAINING
1-6
One Supervisory terminal is typically co-located with each CSU and used
only with that CSU, as shown in Figure 1-1. However, a single Supervi-
sory terminal in a remote service center, for example, can be used to ac-
cess both CSUs by utilizing modems, as shown in Figure 1-2.
To centralize and enhance network control, install PMC-100 Perfor-
mance Monitor Cards. The PMC-100s provide Supervisory terminal ac-
cess to any DataComm 551 in the network, using a single multiplexer
channel on each T1 link for primary intercommunication. And to allow
terminal access in the event of a T1 link failure, install modems such as
GDC's DataComm 596 Modem for dial backup, as shown in Figure 1-3.
Figure 1-4 illustrates a small network and a terminal utilizing modems
for remote access, while Figure 1-5 illustrates a larger network. The
PMC-100 also, on request, polls each DataComm 551 in the network for its
alarm status and displays this on the Supervisory terminal.
For other PMC-100 applications in a DataComm 551 network, and addi-
tional PMC-100 information, refer to Publication No. 048R139-000.
This manual applies only to assembly-level Revision (P) and LATER
DataComm 551 pc cards. You must use Publication No. 048R137-800 for
Revision (N) and EARLIER pc cards. However, the newer DataComm 551
is backward-compatible with the older version, so you can install it in
your existing system.
The major improvement is PMC-100 support, eliminating the need for us-
ing MAU-1As and fallback switches for Supervisory terminal communi-
cations. When replacing an older DataComm 551 with a newer one, refer
to this manual for options settings, but refer to Publication No. 048R137-
800 for detailed discussion of these devices.
Other improvements include the addition of DS0 diagnostics and the DS1
Network Interface Loopback, but these do not affect an existing installa-
tion.
The information regarding the Transcoding and Unframed Mode op-
tions applies only to assembly-level Revision (Y) and LATER DataComm
551 pc cards.
Refer to Section 4 for information on service and training available from
GDC.
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