Additional Configuration Information - 3Com CoreBuilder 5000 User Manual

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Additional This information will assist you when configuring trunks on Token Ring
Configuration media modules.
Information
Unreliable network information may display when the following three
configuration conditions are met:
You have two media modules with their trunks configured on the
same network.
The modules are connected by the backplane.
Building a CoreBuilder 5000 Token Ring Network
Building a CoreBuilder 5000 Token Ring Network (continued)
Definition Recommendation/Notes
Determine the This guide lists the recommended maximum lobe
maximum lobe and and trunk cable lengths in
trunk cable lengths Cable Lengths
you want to use.
Keep in mind that in some cases the required
lobe lengths may dictate the wiring type required.
Decide upon the Use a cable type with the best possible
best type of cable transmission properties in new installations (STP,
for your or UTP Level 4 or greater). Level 3 is supported
environment. on active modules.
Select the CoreBuilder 5000 Token Ring products are
appropriate adapter compatible with 802.5-compliant devices. Not all
cards and media media filters are the same. 3Com offers an
filters when needed. 802.5 optimized and fully-compliant media filter.
Determine whether Use Jitter Attenuator cards on Media Modules
you need Jitter when attaching Ring In/Ring Outs to
Attenuator Cards. non-CoreBuilder 5000 networks (ONline System
Concentrator and IBM 8230 CAU). The cards
also make ring performance more reliable.
Install and verify the Token Ring networks do not over-emphasize a
cable. robust cabling plant because all signals pass
through each cable in the network. A single bad
cable can disrupt or destroy the performance of
the entire Token Ring network.
Once the cabling is installed, verify the cable at
both ends (hub and station) with patch cables
installed. Verification at this level can expose
problems in the cabling plant that were not
apparent when the cable was initially installed
and tested in the wall.
Selecting Appropriate
on page 2-4.
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