S.CON1M/MA System
20
It should be noted that if the TP port of the Master Unit (normally connected to
the switch / router ) has failed, the SLE will cut-off the remote MA device’s TP
port, providing in this manner an optimal bi-directional safe operation.
Thus Two SLE modes of operation are available :
Downstream SLE mode of operation
(link failure of the S.CON1M/MA TP port will
cause the disconnect of the TP port of the remote MA device.)
Upstream SLE mode
(remote MA device link TP port failure will cause the disconnect
of the S.CON1M/MA TP port).
The
SLE
may be used independently or in conjunction with the previously described
FP mechanism enabled in the Master Unit and in the remote MA device. When both
mechanisms are activated (F>T and SLE) then the TP link connecting the appropriate
port (in the Master Unit) to the switch/router will be cut off upon the occurrence of any
one (or more) of the following events:
!
F/O cable broken
!
F/O transmission from the Master Unit failed
!
F/O receiver of the Master Unit failed
!
General Failure of the remote device
!
Reception failure of the remote device
!
Transmission failure of the remote device
!
Outgoing path fiber from Master Unit disrupted.
!
Subscriber failed or disconnected (remote device’s TP port failure)
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.
The
LINK TEST
mode: it is possible to enable the Link Test in the S.CON1M/MA unit
Through DIP switches S4 and S5 (see chapter 11) or through management
commands disabling the FP mechanisms. Set (or remain) in this mode in 2 cases:
!
Whenever your network cannot benefit from FP (i.e. alternate route is not
available)
!
For diagnostic purposes: in this mode each of the link segments (typically 3: TP,
F/O, TP) provides separate and true indication of its integrity therefore the
defective segment can be identified and consequently repaired.
____________________________NOTES________________________________
While in TEST mode, the S.CON1M/MA provides full functionality and run normal
traffic, except the fault propagation. In other words, if one or both converters forming
the link are – by mistake or negligence left in this mode, it will not obstruct normal
traffic.
