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1988-09-04
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#: 23042 S1/General Info/Help
22-Aug-88 19:54:59
Sb: AllenBradley/coax help
Fm: Jim Gogan 76077,674
To: all
Would appreciate any pointers or suggestions on the following from anyone with
familiarity with either Allen Bradley Vista LAN/PC product (token passing over
broadband - basically ARCNET) and/or coax cable specs...... We are in the
process of implementing the use of the Allen Bradley hardware over our
campus-wide broadband cable system to interconnect Novell networks of various
faiths and persuasions. Right now our initial tests have two servers and two
workstations connected directly to the campus broadband system. The
workstation shells and NET$OS files were generated fine, the servers come up
with the right configurations; however, when I try to "ANET3" the workstations
they just hang for a while then come up with the message "RF MODEM DISABLED -
CONTACT NETWORK MANAGER." Now, here's the rub .... ALL the documentation we've
got for AllenBradley says to use RG-6 coax from the broadband tabs to the
network cards. However, we are using RG-59 instead because our
Telecommunications Division says "it's what we use for EVERYTHING." Yeah .....
Anyone know if using RG-59 instead of RG-6 could cause the workstations to not
find a server? -- JG
#: 23252 S1/General Info/Help
23-Aug-88 11:55:25
Sb: #23042-AllenBradley/coax help
Fm: Robert E. Booker 75410,2004
To: Jim Gogan 76077,674
Jim,
Our institution has a large (100+ node) network of Allen Bradley VistaLAN/PC
running over our institutional broadband cable system. We have been doing this
for about three years (we got started before Allen Bradley bought out 3M
Information Services division) and have experienced our share of headaches with
it. The RF Disabled message is a general failure message and can be caused by
several contributing factors including the cable system or the interface card.
It is important that your broadband cable system be properly designed and
balanced to support the Allen Bradley cards.
I doubt that the use of RG-59 vice RG-6 could cause the cards "not to find a
server" but we have found that you are much better off using the RG-6 cable.
RG-59 attenuates higher frequencies more than RG-6. Also, make sure when you
install the drops that you use quad-shield cable...the cost difference is
negligable when compared with the problems this will help you avoid.
I am not sure from your message whether or not this broadband system was
designed for use with Allen Bradley equipment or if you are hooking Allen
Bradley equipment up to an existing cable system. It is important that the
system amplifiers split your cable spectrum properly and amplify the correct
portions for forward and reverse path. Additionally, the system path loss must
be properly designed to work with Allen Bradley equipment. The majority of our
network problems initially were caused by improper levels throughout our cable
system. I need to know a little more about your system before I can respond to
specifics. If you like, you can call me at 404-721-6052 or continue this
thread.
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