Harris Constellation, Installation And Maintenance Manual

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Harris Corporation Constellation™
Introduction 1-15
INTRO
D
UC
TIO
N
Add-drop Multiplexer Configuration
DS1 Configuration
At a repeater, T1 tributaries may be dropped in groups of 4 T1 lines (T1
1-4
, T1
5-
8
, T1
9-12
, and T1
13-16
).
•
A direction: M12 slots 1 through 4
•
B direction: M12 slots 5 through 8
By using the Keypad command, each dropped T2 group may be assigned to any
of the 4 M12 slots.
The protection M12 Unit protects the A and B direction slots.
3DS3 Configuration
For a Constellation Radio with an HLM-3xDS3 unit, any selected DS3 can be
used to access 28xDS1 signals.
For back-to-back terminals, one of the DS3 channels can be selected for a
limited add-drop configuration. In this mode, M12 Units are needed only for
DS1 signals (in groups of 4) that are dropped or inserted; up to 16 DS1 signals
can be dropped/inserted in each direction. Any DS1 signals that are not
dropped are passed to the other terminal via the DS3 cables. DS1 signals may
only be passed through in this mode for up to 5 hops before they are
terminated.