Article View: comp.dcom.sys.cisco
Article #236Problems hooking Cisco to T1 line
From: Tim Drake - E41
Date: Wed, 19 Aug 1992 14:46
Date: Wed, 19 Aug 1992 14:46
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Hi we are tring to bring up a T1 line from Va. to Fla.
The line was tested by GTE and we ran tests with a firebird and
the error rate was well below 1%. We are using a ATT acculink
multiplxer.
Ok, the problem appears to be in the flow control handshanking.
We are using HDLC protocol and want the link speed to be 1.424Mbits/s.
The options for DCE data set controls are :
1) RTS/DCD
2) BO/RI
3) DRS/DSR
4) DTR/CTS
5) Local RTS/CTS
6) In-band Speed
7) RTS Delay
Most of the above have options for , active, inactive, in-band
and background. The odd part with the following setup we are gettng
an 85% success (pings answered) at a slower speed (392,000 bitys/sec)
but less that 5% at the 1,424,000 bits/sec. .
RTS/DCD In-band : 400 bits/sec
Local RTS/CTS Active
DRS/DSR Active
DTR/CTS Inactive
BO/RI Inactive
In-band - means end-to-end
Background - means out of band transmission
Active - means always high
Inactive - low I think and Ignors the remote signal.
We have tried changing the options around but they have had little effect.
WE are not sure what the Cisco wants to see. We have leaned that unless all
but one of the lights on the RS449 applica are lit the Cisco declairs the
interface down.
Our Cisco are running 8.2(4) and 8.2(3). We have an RS449 (Cisco end) to
25 ping connector (DB25 I think) made up to GTE's spec. If anyone has any
insight as to what might be going wrong or set up incorrectly I would
greatly appreciate it.
Thanks Tim Drake tdrake@relay.nswc.navy.mil
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Path: arc1-ca.pugleaf.net!sparky!uunet!ukma!wupost!darwin.sura.net!dtix!relay!relay.nswc.navy.mil!tdrake From: tdrake@relay.nswc.navy.mil (Tim Drake - E41) Newsgroups: comp.dcom.sys.cisco Subject: Problems hooking Cisco to T1 line Message-ID: <1992Aug19.144617.19685@relay.nswc.navy.mil> Date: 19 Aug 92 14:46:17 GMT Sender: news@relay.nswc.navy.mil Organization: NSWC Lines: 59