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Chapter 3 - Configuring the REX2
Campus-REX2 RS Interface Card User Manual 31
Configuring Bridge Protocol, Encapsulation and Timing
The Campus-REX2, as a default configuration, bridges Ethernet frames.
1 Type then press if bridge is not selected.
2 To change the packet encapsulation, type then press . Select an
Encapsulation option:
• cHDLC for Campus-REX2 to another Campus-REX2 application
• PPP when the remote Campus unit has a synchronous interface card
such as a V.35 or when connecting to Ethernet equipment from
another manufacturer
3 To change the timing source, type then press . Select a timing
source setting:
• 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. Set
the other end (remote) of the connection 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.
1 ENTER
2 ENTER
3 ENTER