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7-8 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
Configuring T1 Cards
Enabling a line
Enabling a line
By default each T1 line is disabled. To enable the T1 line, read its profile to make it the
working profile, then set the Line Interface subprofile’s Enabled parameter to Yes, as in the
following example:
admin> read t1 {1 2 1}
T1/{ shelf-1 slot-2 1 } read
admin> set line enabled = yes
admin> write
T1/{ shelf-1 slot-2 1 } written
Specifying the framing and encoding
You must specify the framing and the encoding for each T1 line. If you are using ISDN, you
must specify the extended superframe (ESF) format, which consists of 24 consecutive frames,
separated by framing bits. If the line is not configured for ISDN signaling, use D4 framing
(also known as the superframe format), which is the default.
The T1 Encoding value sets the layer-1 line encoding used for the physical links, which affects
the way in which data is represented by the digital signals on the line. The default, alternate
mark inversion (AMI) encoding, is often used, although bipolar with 8-zero substitution
(B8ZS) encoding might be required if the line is configured for ISDN signaling. If set to None,
encoding is similar to AMI, but without density enforcement.
Your T1 service provider must provide the correct framing and encoding values for your lines.
To specify the framing and encoding, set the Frame-Type and Encoding parameters:
admin> read t1 {1 2 1}
T1/{ shelf-1 slot-2 1 } read
admin> set line frame-type = [esf|d4]
admin> set encoding = [ami|b8zs|none]
admin> write
T1/{ shelf-1 slot-2 1} written
Configuring ISDN PRI signaling
When you set the signaling mode to ISDN, you must set channel 24 as the D channel. Note that
ISDN signaling often requires ESF framing and B8ZS encoding.
For ISDN signaling you must also specify the type of switch providing T1/PRI service to your
TAOS unit. Obtain the information from your ISDN carrier. (For example, if your carrier is
AT&T, the switch type is ATT-PRI.)
Configure ISDN PRI service as follows:
admin> read t1 {1 2 1}
T1/{ shelf-1 slot-2 1 } read
admin> set line frame-type = esf
admin> set line encoding = b8zs
admin> set line signaling-mode = isdn