T1 installation

[day1yun]

I have a general question about t1 installation. I know a t1 uses 24 analog phone lines for data and voice and depending on the type, it uses them differently. Assuming its a pri t1 with 23 available lines and 1 being used as a control line, how it is wired? A cable goes into a csu/dsu wan port in a router? Then from the router to a firewall or a switch? Does the router need more than 1 wan port? Thanks

 

[cb9fl]

As far as I know you're looking at 24 channels, not 24 analog phone lines. Same as how a 56k leased line is far different from a 56k modem.

Normally you'll have the T1 come into a smartjack provided by the LEC. From the smartjack comes basically a network cable, I believe it's actually RJ48X. There will be a short cable coming from the smartjack which will terminate in a loopback box. You plug a network cable into the loopback box and run from there to either your CSU/DSU or a WIC1DSU (Cisco) in your router. That's all that is required WAN side.

 

[PHUNBALL]

cb9fl has it right, I would just add that it uses a 4 pair cable (Cat5, 5e, etc.) between the smartjack and CPE...

 

[Fint]

I have a general question about t1 installation. I know a t1 uses 24 analog phone lines for data and voice and depending on the type, it uses them differently.

Think of it like cable TV. One physical cable, but many "channels". You can use each channel independently (i.e., twenty-four 64k digital phone/data lines) or combine them together to make one larger pipe of 1.5 megabit/sec.