Set Up the Campus-REX System
SET THE TIMING SOURCEThe Timing Source option determines the source of circuit timing on the HDSL link. There are two settings for the Timing Source option:
•Internal: Sets the Campus unit to take its timing from an internal oscillator. This is the default setting.
•HDSL: Sets the Campus unit to take its timing from the HDSL link.
The proper setting of the Timing Source option depends upon the interface card of the remote Campus unit:
•If the Campus-REX is connected to a Campus unit with another Campus-REX RS Interface Card, leave the Timing Source option set to Internal. The Campus system will not operate properly if both units are set to HDSL.
•If the Campus-REX is connected to a Campus unit with a synchronous interface card, such as a Fractional V.35 card, the timing source depends on the setting of the Primary Timing Source option of the remote unit:
–Set the Timing Source to HDSL if the remote unit is set to Internal or Port.
–Set the Timing Source to Internal if the remote unit is set to HDSL.
See the Campus-RS Fractional Interface Card User Manual for information on the Primary Timing Source option.
•If the Campus-REX is connected to a Campus unit with a Campus CSU/DS-1 or CSU/DSX-1 interface card, leave the Timing Source option set to Internal.
Campus-REX RS Interface Card User Manual | 3-29 |