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Thanks for the addl info. I let this post sit for a month for comment before I moved to the next step. I believed I had represented the T1 issue accurately based on what I could google and the comments on this forum. Now looks like I may be close but not entirely accurate. Maybe the...

Thanks all for the information. Based on your input I forwarded this request for technical interpretation to NFPA: What I have been able to learn about the T1 is summarized below, and any or all of these operation characteristics may apply. The equipment information is based on information...

Thanks everyone. I am the fire alarm company. The local AHJ is in favor of using the T1. My concern is I must meet State/NFPA 72 compliance. Its clear no one answering this ??? has used the T1 in this application.

My application is using a T1 as the only source of monitoring a fire alarm system. NFPA appears to prohibit its use because 2-different loop start lines are specifically indicated as required with voltage being supplied by the central office. There is a provision for alternative transmission...

If I understand the T1 correctly, a digital signal is sent from the Central Office on 1-pair of cables to the business. A DSC/CSU at the premises will convert it to either 24 loop start voice circuits, or data circuits, or a combination of both. The DSC/CSU provides dial tone 48volts to the...