User manual

Planning the T1 Interface 5
Parameters Specified to the Carrier
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.