QUESTION:
My customer has had all kind of problems hooking up remote RANs to the
128 port adapter using lease lines and DSU. So far they have install
4 of these devices remotely and have had problems on every one. Problems
have been caused by Lines, Bad cables, .... To date no problems have
been caused by config errors.
They have approximately 15 more remote RAN to install. They are not
looking forward to these and neither am I to say the least.
Is there an easy way to diagnose the 1) Phone line 2)DSU 3)Cable
4) others
They suggested or asked me if there is some kind of devices which
could be installed on a couple of laptops which could be plugged into
the cables and check the circuit?
Can these things be checked with a LED box of some kind?
Any help would be greatly appreciated. The customer is about to
stop all plans for further deployment of the RISC Systems....
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A: I will address your questions in the order that they were
submitted.
Phone Line
Unfortunately, there is no shortcut to diagnosing the phone line.
You may want to contact the company that services your leased line
and ask them for an analysis of the line before configuring the
remote RAN's.
DSU/CSU modems
Many DSU/CSU modem configurations can be tested by loopback
testing. If your synchronous modem has the capability to do
loopback testing, then this is the easiest way to check these
modems. For more information on loopback testing you may wish to
check in the manual for your DSU/CSU modems.
A good test procedure to isolate where your problem lies is the
following:
1. Start out with a configuration like the the one shown below:
128-port adapter----RAN----modem--/\/\--modem----RAN(s)--wrap plug
Look for an "AC" condition on the local RAN. If you do not get
"AC" on the local RAN proceed to the next step.
2. Next, setup the configuration like the following:
128-port adapter----RAN----modem--/\/\--modem--wrap plug
Again, look for "AC" on the local RAN. If you do not get
"AC", proceed to the next step.
3. Setup the following:
128-port adapter----RAN----modem
Put the modem in digital loopback mode (if possible). Do you
get "AC" on the RAN? If not, proceed to the next step.
4. Finally, set up the following:
128-port adapter----RAN--wrap plug
If you do not get an "AC" condition on the RAN, check the SMIT
settings to ensure that they are correct and also your cabling
between the 128-port adapter and local RAN.
NOTE - The local RAN is required for troubleshooting purposes.
It is a good test device since it gives an indication of the
line status along with signal analysis (i.e. RTS, DTR, etc.).
After you get everything working correctly, you may remove it.
Additional information on the 128-port adapter and RAN'S
can be found in the SYSTEM MANAGEMENT GUIDE: Operating System
and Devices (GC23-2486), Chapter 21.
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This item was created from library item Q676660 FFJXB
Additional search words:
ASYNC DEVICE EXECUTE FFJXB HARDWARE IX JAN95 OZNEW PORT PROBLEMS RAN
REMOTE RISCADEV RISCSYSTEM RJE 128
WWQA: ITEM: RTA000052961 ITEM: RTA000052961
Dated: 06/1996 Category: RISCADEV
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