Fast Ethernet Fiber to Fiber Media Module – Installation Guide
7
Sequence of Events
1. Media module
A
loses fiber connection (RX) on MM2/SM2.
2. Media module
A
sends FEF on transmitter (TX) MM2/SM2.
3. Media module
B
detects loss of fiber link on receiver RX –
MM2/SM2.
4. Media module
B
turns off transmitter (TX) on MM1.
5. Media module
A
MM1 is not affected.
Remote Loopback Fiber 1 (Switch 3)
Switch
Position
Mode
Up (default)
Disabled
Down
Enabled
Disabled: This is the normal position for regular operation. The
switch must be set to this position in order for data to pass through
the media module.
Enabled: This is a test mode. All data received on the receive
(RX) fiber connection is looped back to the transmit (TX) fiber
connection.
Note: Only one fiber interface can be in loopback at a time.
Remote Loopback Fiber 2 (Switch 4)
Switch
Position
Mode
Up (default)
Disabled
Down
Enabled
Disabled: This is the normal position for regular operation. The
switch must be set to this position in order for data to pass through
the media module.
Enabled: This is a test mode. All data received on the receive
(RX) fiber connection is looped back to the transmit (TX) fiber
connection.
Note: Only one fiber interface can be in loopback at a time.
