Company "B" has to derive clocking from Company "A" which is why they
have to set up as a tail circuit.
The next case is you have to add a "CSU" (not a CSU/DSU) between them.
The next case is you have CSU/DSUs looking at each other and a null V.35
cable between them.
If you can't get the T1 clocks to agree, you need something with a lot
more intelligence because you have to handle two different data rates.
Options include a router with two T1 serial ports (such as a Cisco 2501
or one of the IRX series). No ethernet required.
Dick St.Peters wrote:
>
> Anybody know of any reasonably low cost equipment for doing this kind
> of extension of a CT1 ?
>
> CT1 --> Box A <-- wire/fiber --> Box B <-- T1 --> PM3
>
> In other words I want to take a CT1 at one place and use a T1 to
> carry the phone calls to a PM3 somewhere else.
>
> Why? Imagine a LATA or telco boundary between Box A and Box B.
>
> One of my users has a house that straddles the boundary betweeen two
> telcos' territories; he has a phone line from one telco at one end of
> his house and a line from a different telco at the other end.
>
> One of my POPs is backed up against a LATA boundary; same telco on
> each side, but they can't carry calls across the boundary. They
> hinted that I probably can, but I don't know how.
>
> I could of course do this:
>
> CT1 --> PM3 <-- Ethernet --> router <-- T1 --> PM3
> LATA 1 | LATA 2
>
> with the LATA boundary splitting the Ethernet.
>
> Since the demarks are the T1 jacks, presumably it's legal to do this:
>
> CT1 --> PM3 <-- long cat5 cable ---><-- T1 --> PM3
> LATA 1 | LATA 2
>
> or this:
>
> CT1 --><-- long cat5 cable ---> PM3 <-- T1 --> PM3
> LATA 1 | LATA 2
>
> In this last case I'm a long distance telco. When the telco hinted
> that I could carry calls across the boundary, they also hinted that
> would make me a telco and qualify me for wholesale pricing. Then they
> clammed up, like they'd said something they shouldn't have.
>
> --
> Dick St.Peters, stpeters@NetHeaven.com
> Gatekeeper, NetHeaven, Saratoga Springs, NY, 1-800-910-6671 (voice)
> Saratoga/Albany/Amsterdam/BlueMountain/Cobleskill/Greenwich/
> GlensFalls/LakePlacid/NorthCreek/Plattsburgh/...
> First Internet service based in the 518 area code
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