IMC Networks IE-IMCV - Manual (Page 53)

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Troubleshooting
If a fiber connection cannot be established, perform the following to make sure that
the fiber transceivers on the IE-iMcV-MultiWay are not over/under driving the fiber
receivers:
1. Make sure the fiber wavelength on both connected devices match (i.e. both are
1310 nm single-mode fiber).
2. Make sure the twisted-pair port speed on the IE-iMcV-MultiWay matches that of
the end devices connected to the IE-iMcV-MultiWay. Configure the IE-iMcV-
MultiWay and its link partner to Auto Negotiation or, if using Force mode, be
sure speed and duplex match.
3. IE-iMcV-MultiWay allows you to assign a VLAN tag to all management traffic
(SNMP and telnet). It is important that you understand that IF you are using
telnet or iView2 to assign a VLAN tag to management traffic, then as soon as this
setting is saved you will lose connectivity to the device until the PC you are using
becomes a member of the VLAN you assigned to management traffic.
If you have assigned a VLAN tag to management traffic and cannot re-establish a
connection to the device via iView2 or telnet, you will need to directly connect a
PC to the device via the serial cable and review/modify the changes you made
(reference section on serial port config).