MCM1000S/L GBE module
06
12
–
SLE (Subscriber Link Emulation)
If the remote device is a FibroLAN MA™ device (GSM1000/MA or GSM1010/MA) and
the MetroStar system is managed, the most powerful SLE feature may be deployed to
further enhancing the network resilience.
SLE Operations
FibroLAN’s
S
ubscriber
L
ink
E
mulation
virtually emulates the subscriber’s device or
network connected to the TP (or F/O) port of the remote device (GSM1010/MA or
GSM1000/MA) onto the F/O link of the MCM1000S/L port module (connected usually to
a switch/router). When activated (
controllable
via the management system only
) it
senses the loss of the TP link (or F/O link) connected to the remote MA device, notifies
the MCM1000S/L and cuts off the port 1 F/O link of the MCM1000S module, alerting in
real time the switch/router of the subscriber’s failure. All this is performed without
disrupting the main F/O link, thus ensuring on-going control of the remote device (CPE)
via MA.
It should be noted that if the F/O link of port 1 of the MCM1000S/L module
(normally connected to a switch/router port) has failed, the SLE will cut-off the TP
port (or F/O) link of the remote GSM1000/MA device, providing in this manner an
optimal bidirectional safe operation.
Thus SLE has in effect two modes of operation:
Downstream SLE mode:
link failure of the MCM1000S/L module F/O input port
(port 1) will cause the disconnect of the link input port of the remote GSM1000/MA
device
Upstream SLE mode: remote MA device link input port failure will cause the
disconnect of the MCM1000S module link port
Again it must be emphasized that this extensive set of features is obtained
only if MA
enabled devices are installed at both ends of the link.
Note: When the SLE mechanism is enabled, it will override the LST mechanism.
During normal network operation, it is recommended to activate the SLE mechanism.
(Enable Downstream and Upstream modes through the management).
Use and stay in the LST ON (TEST mode) if link failure alertness is not needed.
In this case a link failure is indicated by its LED link OFF.
