Re using back-to-back CSU/DSUs:
> From: Daniel Cotts [mailto:[EMAIL PROTECTED]]
> Can do! On the telco side CSU/DSUs have either an 8-pin RJ-45
> type jack or a 15-pin D type connector.
>
> If an RJ-45:
> T-1s use pins 1&2 and 4&5. 56k lines use pins 1&2 and 7&8.
> So for a T-1 to
> go back to back swap 1&2 with 4&5 and 4&5 with 1&2. I take a
> two port (jack)
> surface mount box and make the swap between the jacks. Then I
> use standard
> patch cords between the CSUs and the swap box.
>
> The 15-pin connectors may have adapters to either RJ-45 jacks
> or plugs. Check the manufacturer of your box, if necessary.
Like the guy says -- works nice, and lets you play with
a few settings you won't be able to, with just a DB60 DTE/DCE
cable.
One thing to watch out for is that you may have to set one
CSU/DSU to 'clock internal' and the other to 'clock loop'
(or the same effect, in slightly different phrasing...)
Without this - and in the absence of clock from the telco
switch - the two boxes may/will probably 'lose sync' and
the line drop out. In my experience, eh.
If you had a telco switch, you'd just set 'clock loop' on
both, to take clock from the switch, etc.
HTH: sorry & shout me if not ;-)
Tone
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