Defining T1 According to its Local Trunk Group

Businesses requiring at least 18 or more voice-grade channels for local or long distance calls, or those with a bill of approximately $1000.00 per month should consider a T1. T1s offer major economic advantages over alternative means of access, especially when utilization is heavy or near full capacity for extended times.

In essence, there are two groups of local trunks based on how they transport traffic between parties. Accessibility is obtained as it consolidates the needs for separate local trunks and lines. T1 is capable of accommodating up to 24 telephone lines or trunks and can operate either as a one-way or two-way trunk.

Ancillary services such as OPS/DA, mass calling, and 911 can be established between a CLEC Tandem or End Office switch and an SBC- 13STATE Tandem through a one–way trunk group. They utilize Signaling System 7 (SS7) or multi-frequency (MF) signaling protocol, with SS7 signaling preferred whenever possible. CLEC will have administrative control of one-way trunk groups from CLEC to SBC-13STATE (CLEC originating).

Groups of two-way trunks for local, IntraLATA, and InterLATA can be established between a CLEC switch and an SBC-13STATE Tandem or End Office switch. This group utilizes Signaling System 7 (SS7) or multi-frequency (MF) signaling protocol, with SS7 signaling preferred whenever possible. CLEC will have control for the purpose of issuing Access Service Requests (ASRs) for administrative consistency. Two-Way Local Trunks feature free Local Calling, DID, E911, & Directory Listing.