METRObility Optical Systems 2152-1Y-01 Benutzerhandbuch
14
User Guide
Copper Loss Carry Forward (CLCF)
The copper-to-fiber “twister” incorporates CLCF for identifying a lost copper
connection. When CLCF is enabled
connection. When CLCF is enabled
*
, the fiber port’s transmitter shuts down if the
copper port stops receiving link pulses. However, the copper port continually
transmits link signals regardless of whether or not the fiber port detects link.
transmits link signals regardless of whether or not the fiber port detects link.
The diagram below shows a typical network configuration with good link status
using two copper-to-fiber “twister” units for remote connectivity. Note that CLCF is
enabled as indicated.
using two copper-to-fiber “twister” units for remote connectivity. Note that CLCF is
enabled as indicated.
If a copper connection breaks, the “twister” will carry that link loss forward.
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
"twister"
LED lit = established link
LED unlit = no link
Copper
Cable
"twister"
Copper
Cable
Fiber
Cable
CLCF is ON
CLCF is ON
Port
2
Port
1
Port
1
Port
2
Copper Loss Carried Forward
LED lit = established link
LED unlit = no link
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
Broken
Copper
Cable
"twister"
"twister"
CLCF is ON
CLCF is ON
LED lit = established link
LED unlit = no link
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
Broken
Fiber
Cable
"twister"
"twister"
LLR2 is OFF
Loss of link at the fiber port is not propagated, as shown in the example below.
*Units are shipped with CLCF disabled. CLCF is not applicable to fiber-to-fiber models.