Telco dictates the circuits parameters.. The encapsulation however for a T1
can be decided by you... unless it is frame-relay or X.25 or some type of
data link layer communications needs to happen to telco's switches. The
normal settings these days is ESF / B8ZS for a T1. When you changed the
framing to SF the line and protocol would go to up until the router realized
it wasn't seeing the "keepalives" from the switch then it would switch it to
down.
If this is a new installation of the T1 you might want to make sure the T1
is turned up... I'm not positive what turned up means but I think its just
telco's way of not activating the circuit until you call them and tell them
your ready to be billed for it.
Cory
-----Original Message-----
From: Moahzam Durrani [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 09, 2001 1:10 PM
To: [EMAIL PROTECTED]
Subject: CSU/DSU question
I have an old csu/dsu (rad fcd 1 ) conected to a 7500 router. we use this
T1 to enable two of our sites to communicate point to point (all is working
at the moment). However I am trying to implement that same connection with a
2610 with a built in csu/dsu. Originally I configure the Controller on the
2610 to use ESF framing , B8ZS and PPP encapsulation. This router was in
operation before , being used as an Internet router
so I know the HW is good. Hower when i connected the 2610 with the new
config (wiped out old onfig when used for internet) to the TI (provided by
PAC BELL) being use on the 7500 I got some weird results.
serial x (reset) , line prot down
Then I changed the encapsultion to HDLC ,that got rid of the reset , and
changed the framing to SF . When I changed to framing , i got se up, line
prot up , then few seconds later i did a sh int and saw the up , down.
I tested my controller to make sure HW is ok by connecting it to one of the
T1'S providing internet access. It worked fine , off course I had to change
to esf, b8zs and ppp.
Is it the telco who prvides us what we should use as framing, linecode and
encapsulation? or does it depend on the csu/dsu being used. ???
Mo Durrani
IS&T
WYSE\EDS
phone:408-473 1246
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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