Avaya Communication Manager Administrator's Manual page 786

Screen Reference
DS1 Circuit Pack
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
b8zs (bipolar eight
zero substitution)
ami-zcs (alternate
mark inversion -
zero code
suppression)
ami-basic (alternate
mark
inversion-basic)
hdb3 (high density
bipolar 3)
cmi (coded mark
inversion)
786
Usage
Enter b8zs for T-1 facilities that support voice and/or data
traffic. Enter b8zs if you need a 64K clear channel.
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.
Enter ami-basic for unrestricted E-1 facilities.
Enter hdb3 for restricted E-1 facilities.
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.
Administrator's Guide for Avaya Communication Manager
November 2003