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Planning the T1 Interface

5

Certain parameters are specified to the carrier when provisioning the T1 line.

You will need to provide the following information to a T1 facility provider.

• 

Individual Access Line 



 Select the Phone service or Line Pooling Arrangement, which is sometimes termed

Multi-Hunt Grouping. With Line Pooling, one phone number is assigned to a group of end terminals, and the
first available terminal will receive the call.

• 

B8ZS or AMI line code 



 B8ZS is preferred.

• 

ESF or D4 framing format 



 ESF is preferred because of its enhanced diagnostic and maintenance capabilities.

• 

Supervisory Signaling Method 



 Robbed bit signaling; ground start, loop start, immediate start, or wink start

• 

Dual-tone Multi Frequency (DTMF) or pulse-dial addressing 



 DTMF preferred

• 

Be sure you ask for a “trunk-side” T1. Most carriers will provision “line-side” T1s by default, which will cause
lower speed modem connections.