Transition Networks C/E-PSW-FX-03, User Manual

INSTALLATION 

(continued)

100BASE-FX Full-Duplex Optical Loss Budget

An 11dB loss budget (measured using a fiber optic power meter) is
allowed per link of 100BASE-FX Full-Duplex cable. Standard grade
fiber operating at 1350 nm has approximately 1dB – 2dB loss per
1000 meters of cable. Approximately 0.5dB– 2.0dB loss per
connection point is typical, depending on the integrity of the
connection. 

Connecting Fiber Cable (100BASE-FX)

100BASE-FX AND THE FAST ETHERNET COLLISION DOMAIN

•

Refer to the 512-Bit Rule before installing half-duplex 100BASE-

FX cable (

≤

415 meters).

•

Using full-duplex fiber cable avoids collision domain

considerations and extends distances up to 2 kilometers
(multimode) or up to 20 kilometers (singlemode).

•

NOTE: A Fast Ethernet collision domain can have ONLY ONE

CLASS I repeater OR TWO CLASS II repeaters.

INSTALLING CABLE

To install 100BASE-FX cable:

1. Locate or build 100BASE-FX cables:

•

803.2u compliant 

•

with male transmit (TX) and receive (RX) fiber connectors
installed at both cable ends.

2. Connect transmit cable connector at one end of fiber cable

to bridging media converter connector marked with an
“outbound” arrow; connect receive cable connector to
bridging media converter connector marked with an
“inbound” arrow.

3. Connect other end of cable installed at transmit (TX)

connector of bridging media converter to receive (RX)
connector on network device; connect other end of cable
installed at receive (RX) connector of bridging media
converter to transmit (TX) connector on network device.

Powering the Bridging Media Converter

NOTE: The Slide-In-Module is powered through the Media
Conversion Center.

Using the 5-Segment Rule (10BASE-T)

The Ethernet 10BASE-T 5-segment rule defines a segment as the cable
connection between station interfaces. The transmission path between
any two terminal devices in the same collision domain can consist of
no more than five segments. Installing the TRANSITION Networks’
bridging media converter in the network separates collision domains,
so the 10BASE-T 5-segment rule applies separately to each collision
domain.

To assign segment numbers to cable connections:

1.

Determine the network device separated from the Transition
Networks’ pocket switch by the greatest number of segments. 

2.

Define a segment path between that network device and the
Transition Networks’ pocket switch by labeling the cable
connection to the Transition Networks’ pocket switch “segment
1” and numbering each segment in the path to the terminal up to
“segment n” (n = total number of segments  

†

5). 

3.

Verify that no segment path in the collision domain contains
more than n  

†

5 segments.

4.

Repeat steps 1-3 for next collision domain.