GSM1000 Gigabit Converter
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11 – 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 can be deployed,
further enhancing the network resilience.
Figure-3 SLE Operation
FibroLAN’s
S
ubscriber
L
ink
E
mulation virtually emulates the subscriber’s device or
network connected to the F/O (or TP) port of the remote device (GSM10x0/MA) onto
the F/O link of the Network device A. When activated (
controllable
via the
management system only
) it senses the loss of the F/O link connected to the remote
MA device, notifies the MCM1000S/L and cuts off the F/O link between the MCM1000S
module port 1and the port of the Switch/Router which is alerted in real time 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
F/O link between the GSM1000/MA and the Remote Network device B 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 link disconnect of the input port of the Network device B.
•
Upstream SLE mode:
remote GS1000MA device link input port failure will
cause the link disconnect of the Network device A.
Note: When both SLE and LST are enabled, the SLE will override the LST
mechanism if the input port link (at the MCM1000S/L module or at the remote MA
device) has failed. On the other hand, if the F/O link is disrupted (main F/O link)
the LST will take over and execute the required actions.
During normal network operation, it is recommended to activate the SLE mechanism.
(Enable Downstream and Upstream m odes through the management).
Users requiring real time alert (Fault Propagation) upon a failure may define both
directions of alert (in GSM1000) and in one direction in GSM1000/MA.
Use and operate the LST (in TEST mode) in order to determine and locate a failed
Link segment.
