Cabletron Systems MicroMMAC 24T MICROMMAC- - Manual (Page 53)

INSTALLATION
3-18
• The physical communication link consists of two strands of fiber optic
cabling. The Transmit strand (TX) at one end connects to the Receive
(RX) port at the other end and vice versa.
• Cabletron Systems labels its fiber optic cable to indicate which fiber is
Receive and which is Transmit: one fiber is labeled 1, and the other
fiber is labeled 2. If using a non-Cabletron cable, labeling in the above
manner is recommended.
CAUTION: Do not touch the ends of the fiber optic strands. Dust, dirt, and
other contaminants on the ends of the strands create data transmissions
problems. If the ends become dirty, clean them with alcohol using a soft,
clean, lint free cloth.
To connect a fiber optic link segment to the TPIM-F2 /-F3:
1. Remove the protective plastic covers from the appropriate fiber optic
ports on the module and from the ends of the connectors on each fiber
strand.
2. As shown in Figure 3-17, attach the fiber labeled 1 to the module’s
receive port (labeled RX) and attach the fiber labeled 2 to the module’s
transmit port (labeled TX).
Figure 3-17. The TPIM-F2/-F3
3. At the other end of the fiber optic cable, attach the fiber labeled 1 to the
transmit port of the device and attach the fiber labeled 2 to the receive
port.
4. Check that the LNK LED on the TPIM lights green. If the LED does
not light, perform each of the following steps:
RI
RO
6 5 4 3 2 1
18 17 16 15 14 13
TPIM-F2
LNK
TPIM-F2
LNK RX TX
RX TX