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Configuring WAN Line Services
7-16 117021-A Rev. A
Setting the Secondary Clock Source
On DMCT1 net modules and QMCT1 or QMCT1 w/ DS0A link modules only,
you canSpecify a backup source for timing signals:
Select Internal to use the clock chip on the link or net module.
Select Port 1 Ext Loop to use the signal coming in from Port 1.
Select Port 2 Ext Loop to use the signal coming in from Port 2.
Select Port 3 Ext Loop to use the signal coming in from Port 3 on a QMCT1.
Select Port 4 Ext Loop to use the signal coming in from Port 4 on a QMCT1.
Select Auxiliary Ext to use an external source via Port 1 on a QMCT1.
Configuring a DS0A Connection
This section describes how to configure a T1 connection to a QMCT1 DS0A link
module to carry SDLC traffic.
First, you need the following information from the subscriber:
The data rate of the SDLC connection between the IBM host and the CPE (see
F
igure 7-4).
To establish a connection, the subscriber must match this rate to that of the
SDLC connection between the controller and CPE on the remote access side.
You use this rate to set the Adaption Rate logical line parameter for both the
router connecting the host side and the router connecting the remote access
side.
The line encoding settings of both the host and CPE, and the controller and
CPE on the remote access side.
These settings can be different on the subscriber’s devices. Each can be NRZ
(nonreturn to zero) or NRZI (nonreturn to zero inverted).
You use these settings to set the NRZI Enabled logical line parameter. The
setting of the NRZI Enable parameter on a router connecting a host side is
unrelated to and can differ from that connecting a remote access side.
Site Manager: Secondary Clock parameter: page A-33
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