Allied Telesis AT-MR912TX - Manual (Page 32)

Product Description
12
100Base-FX Wiring Specifications
An earlier IEEE FOIRL standard limited a fiber optic segment length to 1 km
(1,000 meters or 3,280 feet). That is, the fiber optic cable that connected two
repeaters was limited to 1 km (3,280 ft.).
While the more recent IEEE 802.3 100Base-FX standard is compatible with
FOIRL, it can travel up to 2 km. (2,000 meters or 6,560 feet) using multimode
duplex fiber optic cable in a point-to-point link which directly attaches two
devices.
Duplex Fiber Optic Cable
Both 62.5/125 micron and 50/125 micron duplex optical fiber cable is
supported. Duplex refers to support for fiber optic cable pairs: a two-cable fiber
optic connection with transmit mode dedicated to one cable and receive mode
on the other.
Normally, duplex fiber optic cable is labeled TX or TD (transmit) and RX or RD
(receive). You must connect the receiving port (RX or RD) on one device to the
transmitting (TX or TD) port on a second device for proper connectivity.
To connect a network device to the fiber optic port on the AT-MR902
100Base-FX Module:
1. Attach both connectors at one end of the cable to the TX and RX ports on the
network device.
2. Connect one of the paired connectors at the other end of the cable to the RX
port on the repeater.
3. Check for On Line indicator to illuminate. If it does, connect the other of the
pair to TX. If On Line stays off, unplug the connector from RX and use the
other of the pair.