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Chapter 7 - Using the LCD for Configuration and Management
Campus-REX2 RS Interface Card User Manual 105
• 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.
1 To 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.