For back-to-back serial connections one end must be DTE and the other DCE.
The router with the DCE end must be configured to provide line clocking.
Your DTE cable most likely is a CAB-V35MT PN 72-0791-01.
If you don't use a Y cable, then your DCE cable should be a CAB-V35-FC PN
72-0792-01 (DCE and Female Winchester connector.) It works - although the
total length is 20'. If you do use a Y cable then your DCE cable can be a
CAB-V35MC PN 72-0802-01 (DCE and Male Winchester connector.)
To connect T-1 CSU/DSUs back to back (assuming RJ-45 jacks) connect pins 1&2
with 4&5 and 4&5 with 1&2. For 56k CSU/DSUs cross 1&2 with 7&8 both ways.
Using the CSU/DSUs certainly is closer to real world implementations.
Have fun!!
> -----Original Message-----
> From: Hartnell, George [mailto:[EMAIL PROTECTED]]
> Sent: Friday, February 02, 2001 1:15 PM
> To: [EMAIL PROTECTED]
> Subject: Speaking of cables....
>
>
> Hi,
>
> I jus' happen to have a couple of 2600 series routers, 2610 &
> 2611, as well
> as a Network General WAN Sniffer. I also have a 'Y' cable, with V.35
> female-female ends. The third 'Y' leg goes to the WAN
> Sniffer. I have one
> (1) Cisco V.35 DTE serial cable, male.
>
> There are a smattering of other router vendors around here,
> too. HP, Bay,
> Wellfleet. I've found it useful to sniff the various WAN
> protocols between
> vendors, from time to time. Very instructive.
>
> What I'd like is to connect the two Cisco's for a training
> lab, of sorts,
> for myself, and my staff. I'd like to be able to cross-connect serial
> router ports on all those vendors, but Cisco would be sufficient.
>
> So, can I procure a Cisco DCE serial cable and complete the
> cross-over that
> way? I realize I'd need a gender-bender, given the f-f
> config of the 'Y'.
> That would also negate a generic V.35 to those other routers
> mentioned, I'd
> have to fabricate a cross-over for each.
>
> Can I procure another Cisco DTE V.35 cable and cross over
> within the 'Y'?
> What would be, or where can I find, the pin outs for that?
>
> Finally, how might you, gentle reader, do this another way?
>
>
> Cisco serial----V.35------V.35-----Cisco serial
> |
> |
> -------------WAN Sniffer
>
> I also have a couple of CSU/DSUs available. Forgive my
> ignorance, but I've
> only used them over point-to-point and frame T1s on public
> networks. Can I
> directly wire those devices back-to-back and achieve
> router-to-router WAN
> connections in that way, as well? Again, what might be the
> wire chart for
> that T1-like circuit labeled 'cu', below?
>
> Router----V.35-----V.35---CSU/DSU-----(cu)-----CSU/DSU-----V.3
5-----Router
> |
> |
> ---------------WAN Sniffer
>
> Thanks for any ruminations on this connectivity issue.
>
> Best regards, G.
>
> "Be strict in what you send, and forgiving in what you receive."
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> George Hartnell, Network Supervisor
> Bellingham School District, 1306 DuPont St.
> Bellingham, Wa. 98225-3198 (360)647-6860
> [EMAIL PROTECTED] Internet Mail
>
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