Lucent Technologies 8.2 User Manual

Issue 1

April 2000

Managing trunks 

353

Setting up digital trunks 

The table below shows recommended settings for standard T1 connections to your 
local exchange carrier.

If you use b8zs line coding and esf framing, it will be easier to upgrade your T1 
facility to ISDN should you want to. You can upgrade without reconfiguring 
external channel service units, and your service provider won’t have to 
reconfigure your network connection.

DS1 administration for E1 service varies from country to country. Refer to 
DEFINITY ECS Application Notes for Type Approval and use the DS1 screen 
illustrations in the chapter for your country as a model for your administration.

Remember that the central office serving your switch may be emulating 
another country’s network protocol. If so, you’ll have to administer your 
circuit packs and trunk groups to match the protocol used by your central 
office.

Normally, you can’t change the DS1 Circuit Pack screen unless you remove all 
related trunks from their trunk group. However, if the DS1 MSP field on the 
System-Parameters Customer-Options screen is 

 and you are assigned the 

associated login permissions, you can change some of the fields on the DS1 
Circuit Pack screen without removing the related trunks from their trunk group. 

Line Coding

b8zs

Use ami-zcs if b8zs is not 
available.

Signaling Mode

robbed-bit

Robbed-bit signaling gives you 
56K bandwidth per channel. If 
you need a 64K clear channel 
for applications like 
asynchronous data transmission 
or remote administration access, 
use common channel signaling.

Framing

esf

Use d4 if esf is not available.