Administrator's Guide

DS1 Circuit Pack
Issue 5 October 2002 765555-233-506
Line Coding
This field selects the type of line coding used on this facility. The setting in this
field must match the setting on the far-end of the link, or you must have an
intervening CSU to convert the line coding protocols. Voice calls will work even
if line coding does not match, but a single data call will bring down the DS1
facility. For the TTC 2Mb CMI Trunk circuit pack, this is a display-only field
showing
cmi (coded mark inversion).
The following information is for reference. Talk with your network service
provider or your Avaya representative to find the appropriate protocol for your
application.
!
CAUTION:
If you change this field, you must busy out the DS1 circuit pack. You must
also change the following screens: Route-Pattern, Access Endpoint, PRI
Endpoint, Signaling-Group, and Trunk-Group.
NOTE:
When the DS1 circuit pack is used for ISDN service, the ISDN D-channel
data is inverted when
ami-basic or ami-zcs is entered and not inverted
when
b8zs or hdb3 is entered.
Valid entries Usage
b8zs
(bipolar
eight zero
substitution)
Enter b8zs for T-1 facilities that support voice and/or
data traffic. Enter
b8zs if you need a 64K clear channel.
ami-zcs (alternate
mark inversion -
zero code
suppression)
Enter ami-zcs only for T-1 facilities that carry voice
traffic: Avaya does not recommend this for digital-data
applications. If you anticipate upgrading this facility to
ISDN, use b8zs line coding if possible.
ami-basic
(alternate mark
inversion-basic)
Enter
ami-basic for unrestricted E-1 facilities.
hdb3 (high
density bipolar 3)
Enter hdb3 for restricted E-1 facilities.
cmi (coded mark
inversion)
Used in Japan, cmi is the only type of line coding you
can use with the Japanese 2Mbit trunk circuit pack. This
field becomes a display-only field when you are
administering the Japanese 2Mbit trunk circuit pack.