Chapter 7 - Using the LCD for Configuration and Management

•Internal (default setting) which takes its timing from an internal oscillator

•HDSL which takes its timing from the HDSL link

The Timing Source option determines the source of circuit timing on the HDSL link. The proper setting of the Timing Source option depends upon the interface card of the remote Campus unit:

•If the Campus-REX2 is connected to a Campus unit with another Campus-REX2, leave the Timing Source option set to Internal. The other end of the connection can be set to HDSL; the Campus system will not operate properly if both units are set to HDSL.

•If the Campus-REX2 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 Data 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-REX2 is connected to a Campus unit with a Campus CSU/DS-1 or CSU/DSX-1 interface card, set the Timing Source option to Internal.

Setting the Encapsulation

This section describes how to configure the Encapsulation type for data sent by the Campus-REX2. The LCD navigation to get to this submenu was provided in the section “Accessing LCD REX2 Configuration” on page 104.

1To select the Encapsulation, do one of the following:

•If the mode is set to Encapsulation, go to Step 2.

•If the mode is not set to Encapsulation, press Next until the LCD displays Encapsulation, then press Enter. The Operating Mode changes to Encapsulation=cHDLC.

Campus-REX2 RS Interface Card User Manual

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