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E-13550-A2-GB20-10 February 1995
Application Configurations
Overview E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Point-to-Point Applications E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multipoint Applications E-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This appendix shows examples of typical point-to-
point and multipoint applications for both control and
tributary DSUs. Refer to Figures E-1 and E-2 when
configuring your network.
Point-to-Point Applications
Model 3550 and Model 3551 DSUs provide both
single-port circuit support; only the Model 3550 DSU
supports TDM/Flex circuit support.
When a V.32 DBM is installed, the DSU provides full
backup capability when operating at speeds of 14.4 kbps
or below. Backup can be automatic, or it can be initiated
manually from the DSU’s control panel or a 6700 Series
NMS.
External dial backup units (DBUs), like 3800 Series
modems, can also be used for backup when the External
Backup (ExtBU) configuration option is enabled (refer to
Chapter 5).
Figure E-1 shows a point-to-point configuration using
both a carrier-mounted Model 3551 DSU and a standalone
Model 3550 DSU configured as controls. These units have
the PTPC configuration. The standalone DSU shows both
a DBM and a TDM/Flex installed; the carrier-mounted
DSUs are equipped with DBMs.
On the tributary side of the configurations a
Model 3550 DSU is paired with a 3800 Series modem for
backup. Other tributaries, each equipped with a DBM and
TDM/Flex, are shown; one is paired with a carrier-
mounted DSU, and the other is paired with another
standalone DSU.
Refer to your 6700 Series NMS documentation before
connecting the NMS to the circuit.
E