“twister” 2111 Media Converter 17
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
“twister”
“twister”
Remote
up to 15km
LED lit = established link
LED unlit = no link
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
“twister”
“twister”
Broken
Remote
Cable
Trap generated
Trap generated
Link Loss Carried
LED lit = established link
LED unlit = no link
Link Loss Carry Forward (LLCF)
*
The “twister” 2111has been designed with a LLCF function
for trouble-
shooting a remote connection. The unit is shipped with the LLCF disabled.
When LLCF is enabled, the fiber optic ports as well as the twisted-pair ports
on the 2111 do not transmit a link signal until they receive a link signal from
the opposite port. For example, if LLCF is enabled and two “twister” media
converters are connected via a fiber cable with nothing else connected to them,
the Link LED does not illuminate. When a valid link is established at the
twisted-pair port, a complete connection is accomplished.
The diagram below shows a typical network configuration using a “twister”
media converter for remote connectivity:
If the fiber connection breaks, or the remote device fails, the “twister”
media converter carries that link loss all the way to the switch/hub which
generates a trap to the management station. The administrator can then
look at the media converter to determine the source of the loss.
IMPORTANT: When connecting a “twister” media converter with LLCF
enabled to an auto-negotiating device, force both sides of the configura-
tion to either 10 or 100Mbps full or half duplex. This allows the media
converter to immediately see link pulses and start passing data.
*
Does not apply to the “twister” 2111-12 (BNC).
Summary of Contents for twister 2111-12-01
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