2.6.2 Installing Fiber-optic Cable
Refer to the appendix for cable specifications for the 10BASE-FL or the
100BASE-FX fiber-optic installation.
Installing Cable
1.
Locate or build 10BASE-FL-compliant or 100BASE-FX-compliant
cables (depending upon Multichannel Media Converter selected
for the site), with male two-stranded TX to RX connectors installed
at both ends.
2.
Connect TX and RX connectors at one end of cable to mating
Multichannel Media Converter TX and RX fiber-optic connector.
3.
Connect cable with connector installed at TX location on
Multichannel Media Converter channel to RX location on
attached network device.
4.
Connect cable with connector installed at RX location on
Multichannel Media Converter channel to TX location on
attached network device.
Testing Fiber Link(s)
NOTE: The Link Test switch (DIP switch #7) enables and disables the Link
Test feature for a block of six (6) Multichannel Media Converter channels.
When the Link Test feature is enabled (set to NORMAL position), if the
Multichannel Media Converter senses loss of a twisted-pair link, the
associated fiber-optic link is cut. Then the remote device senses loss of the
fiber-optic link and, if the remote device is another Multichannel Media
Converter also set to NORMAL mode, the remote Multichannel Media
Converter disables the twisted-pair port. Finally the remote device
becomes aware that the link to the opposite end device connected to this
channel is not fully functional and subsequently triggers a back-up
mechanism (if so equipped) and/or alerts the network manager.
Thus, when the Link Test feature is enabled (set to NORMAL position), if a
Multichannel Media Converter does not detect a good link on the twisted-
pair 10BASE-T /100BASE-TX side of any channel, the Multichannel Media
Converter disables all data transmission (including active-idle) on the
fiber-optic 10BASE-FL/100BASE-FX side of that channel.
However, the network administrator facing a device with no link
indication cannot tell whether that no link indication is due to the loss of
the fiber-optic link or due to loss of the remote twisted-pair link.
Therefore, when installing a fiber-optic network, disable the Link Test
feature (set to TEST position) to establish that the Multichannel Media
Converter fiber-optic links are operational and THEN connect network
devices through the twisted-pair links.
2.10
METTF10xx, MFETF10xx
TX
RX
TX
RX
