Trunk Interoperability Problems - 3Com CoreBuilder 5000 User Manual

Trunk
Interoperability
Problems
3 If the trunk ring appears to be operating, the problem source may
reside at higher software layers. If your network is based around a
single file server, problems in the server or its network attachment can
cause the ring to fail.
If your trunk connections to CoreBuilder 5000 Token Ring Modules are
not operating properly, check each of the following and ensure that
you:
1 Have set each end of the connection to the proper compatibility mode
(see Chapter 4 for more information).
2 Install a jitter attenuator card on the CoreBuilder 5000 module if
connecting to a non-CoreBuilder 5000 ring.
3 Only connect CoreBuilder 5000 fiber trunks to 3Com ONline System
Concentrator, 3Com CoreBuilder 5000 hub, IBM 8250 hub, IBM 8260
hub, or IBM 8230 CAU trunk ports. The JA LED on the module should
light.
4 Check that all cabling used meets the specifications outlined in
Chapter 2.
5 Check that the fiber cabling is connected properly (that is, transmit
always connects directly to receive).
6 If using the Ring-In/Ring-Out ports on an Active Per-Port Media
Module or an Active Per-Module Media Module, make sure that you
either:
Install cable adapter 6200ADT-RI on the Ring-In port, which crosses
over the RX/TX wires in the cable.
Use a cable on the Ring-In port that crosses over the RX/TX
connections. See Appendix A,
7 When trunk ports are enabled, check that the jumpers for the trunks
are set properly.

Trunk Interoperability Problems

Figure A-1, for a pinout diagram.
5-7