Cabletron Systems NBR-420 사용자 설명서

Chapter 3: Installation

3. Attach the fiber labeled 2 to the applicable transmit port labeled TX, 

on the module.

4. At the other end of the fiber optic cable, attach the fiber labeled 1 to 

the transmit port of the device.

5. Attach the fiber labeled 2 to the receive port.

6. Check that the LNK LED on the applicable module port is on. If the 

LED is not on, perform each of the following steps until it is:

a.

Check that the device at the other end of the link is on.

b. Verify proper “crossover” of fiber strands between the applicable 

port on the module and the fiber optic device at the other end of 
the fiber optic link segment.

c.

Verify that the fiber connection meets the dB loss specifications 
outlined in Section C.1.2, Multimode Fiber Optic Network.

If you still cannot establish link, contact Cabletron Systems Technical 
Support.

Connect a thin-net segment to an EPIM-C as follows:

1. Set the Internal Termination Switch (see Figure 3-16), located to the 

right of the port and labeled TERM, to either of the following 
positions:

•

The ON position ( ) to internally terminate the thin-net segment 
at the port.

•

The OFF position ( ) if you do not want the thin-net segment to 
internally terminate at the port.

2. If the Internal Termination switch is in the ON position, connect the 

thin-net segment directly to the BNC port.

3. If the Internal Termination switch is in the OFF position, perform the 

following steps:

a.

A

ttach a BNC tee-connector to the BNC port on the module.