Fiber Optic Modules

Six different Fiber Optic modules are available for the rack mountable Auto-Sensing hubs (EFAH16 and EFAH24):

FFOSC1: 100BaseFX 1-Port Transceiver Module (SC)

FFOSC2: 100BaseFX 2-Port Transceiver Module (SC)

FFOST1: 100BaseFX 1-Port Transceiver Module (ST)

FFOST2: 100BaseFX 2-Port Transceiver Module (ST)

FFOSCDE1: 100BaseFX 1-Port Distance Extender Module (SC)

FFOSTDE1: 100BaseFX 1-Port Distance Extender Module (ST)

When a single port module is used on EFAH24, port 12 cannot be used. If used on the EFAH16, port 15 cannot be used. The module uses up one connection.

When the dual port module is used on EFAH24, ports 12, 24, and uplink cannot be used. If used on the EFAH16, ports 15,16, and uplink cannot be used.

Each Fiber port has two connectors, a transmit (TX) and a receive (RX). To connect two modules together, you must run a cable from the transmit connector on one module to the receive connector on the other. If you are looking at the back of the hub, the connector on the right is the receiver and the connector on the left is the transmitter. The connectors are also labeled on the top of the fiber port. These labels can not be seen after the module is installed, so make sure that you look before you slide it in.

Each Distance Extender Modules has a switch on the back for Full Duplex or Half Duplex. The switch must be set to Half Duplex at all times, when connecting to another Distance Extender or a Transceiver module. The Link LED will light up when there is a connection made, and the Activity (ACT) LED will flicker while data is being transmitted or received.

Each Port on the add-on modules has a corresponding jumper on the main board of the module. If the jumper is removed, the corresponding fiber port will become disabled and the correspodoning RJ-45 port on the front of the hub may be used. When the jumper is connecting the pins, the port is enabled, when the jumper is removed the port is disabled. The dual port transceiver module has two jumpers, one for each port.