Harris Constellation, Installation & Maintenance

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Constellation™ November 2003
D-4 Service Channel
Figure D-2: Single loop system with two terminals at
repeater site
Multiple Loop System, a Loop within a Loop
Multiple Loop System, a Loop within a Loop ( Figure D-3 ) shows a loop system
within a loop system. The inner loop is the same loop as discussed in the first
loop system (Single Loop System Using Repeaters), and its operation is
identical. The second loop is made up of a Master Terminal and three Slave
Terminals and looks like a linear system that is connected to the main loop.
The outer loop operates as follows. The Master Terminal generates a pilot so
that it can propagate through two Slave Terminals and to the third Slave
Terminal where it is looped back and returned to the Master Terminal. If the
pilot is detected, the Master Terminal does not transmit or receive any data.
Terminal
Slave
Repeater
Slave
Repeater
Slave
Pilot A
Pilot A
Pilot A
Pilot A
Pilot A
Pilot B
Pilot A
Pilot B
Terminal
Master
Data
VF
DATA
DATA
DATA
Direction A Direction B
Terminal
Slave
Terminal
Slave
Data
VF
External
Pilots
A
A
A
B
A
B
A
A