IMC Networks iMcV-Gigabit, Operation Manual

8

Installation Troubleshooting 

•

During installation, first test the fiber and twisted pair connections with all 
troubleshooting features disabled, then enable these features, if desired, just 
before final installation.  This will reduce the features’ interference with 
testing. 
 

•

When working with units where the features cannot be disabled, you must 
establish BOTH your twisted pair and fiber connections before the link 
LEDs will light. 
 

•

When connecting the fiber interface of an iMcV-Gigabit module (-00) to the 
fiber interface of a Gigabit switch (with fixed configuration or modular 
design, GBIC/SFP), you may experience difficulty establishing a link. Please 
check the following: 
 

o

Solution 1–

Within the switch configuration (either via SNMP or a CLI), 

ensure that the setting for the fiber port in use is set to 1000 Mbps, 
Full-Duplex.  Manually setting the switch port will result in normal 
operation and a link will be established.  Also, ensure auto-negotiation 
is switched OFF. 
 

o

Solutions 2–

Within the switch configuration, ensure that IEEE 802.3x 

Flow Control is disabled for the Gigabit port in use. 
 

•

If using a high powered device (which is designed for long distance 
installations) for a short distance installation, the fiber transmitters may 
overdrive the receivers and cause data loss.  If this is the case, you may 
need to add an optical attenuator to your connection.  
 
For fiber specifications, visit the IMC Networks Web site at 

www.imcnetworks.com/adocs/fcs.asp

 or contact IMC Networks for more 

information.