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Board Configuration
to a one. Bell Zero Code Suppression replaces bit 7 of an all zero
channel byte with a one.
•
If you click the T1/PRI Configuration button you can set channels to
either T1 or PRI, as discussed page 65.
•
You can set the Back-to-back T1 Clock Master if you have a back-
to-back configuration and you want this span to be the master clock to
the system. (Only one clock master should be selected in a back-to-
back system.) See the following discussion.
T1 Clocking
Depending on the configuration of the T1 boards and span for your
AltiServ system(s), the Back-to-back T1 Clock Master setup should be
set according to the follow conditions:
•
If all of the T1 boards are connected to an FXO (Foreign Exchange
Office) or CO, the Back-to-back T1 Clock Master check box must
NOT be checked for any of the T1 boards.
•
If two AltiServ systems are connected back-to-back with a T1 span,
the Back-to-back T1 Clock Master check box must be checked for
only one of the T1 boards.
•
If twoT1 boards in the same AltiServ system are connected back-to-
back with a T1 span, the Back-to-back T1 Clock Master check box
must be checked for the T1 board that has not been designated by the
MVIP setting as the system's master clock to drive the MVIP bus .
•
If four T1 boards are in the same AltiServ system, where each pair is
connected back-to-back with a T1 span:
— The Back-to-back T1 Clock Master check box must be checked
for one of the T1 boards from the first pair, that has not been
designated by the MVIP setting as the system's master clock to
drive the MVIP bus.
— The other two T1 boards of the second pair must have its Back-to-
back Clock Master check box unchecked.
IMPORTANT! In all back-to-back cases, the MVIP Clock
Configuration should be set to "Manual," and the board connected to the
board configured as the back-to-back clock master must be designated at
the MVIP bus master.
64 AltiWare OE System Administration Manual
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