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Magnum 6KM Mobile Ethernet Switch Installation and User Guide 07/10
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5.1.2 6KM4-4M12, 4 x 10/100Mb M12 (Slot C)
The 6KM4-4M12 4-port Copper module provides four 10/100Mb switched
M12 ports. The 10/100Mb switched ports normally (as a default setting) are
independently N-way auto-negotiating and auto-crossover (MDIX) for operation at 10 or
100Mb speed in full- or half-duplex mode. (i.e., each independently selects a mode and
speed to match the device at the other end of the twisted pair cable).
(for auto-negotiation and MDIX details, see Section 4.2 in this 6KM User Guide).
On the model 6KM4-4M12 module, there is one LED for each port. The
Link/A LED indicates Link “ready for operation” for that port when lit. The A (Activity)
LED indicates receiving Activity on that port when blinking. A twisted pair cable must
be connected into an M12 port and the Link indicator for that port must be ON
(indicating there is a powered-up device at the other end of the cable) in order for a Link
LED to provide valid indications of operating conditions on that port.
Using the 6K (MNS-6K or MNS-6K-SECURE) management software, the
user may disable auto-negotiation and fix the desired operation of each M12 port. The
user may select 10Mb or 100Mb speed and full- or half-duplex mode per-port as per user
requirements. (See Magnum MNS-6K Software Manual for additional info)
NOTE: for Power Substations
: In support of the IEEE 1613 Class 2 standard, GCI
advises that, for substation applications, the M12 ports are intended for
connectivity to other communication equipment such as routers or
telecommunication multiplexers installed in close proximity (i.e., less than 2
meters or 6.5ft) to the 6KM. It is not recommended to use these ports in
substation applications to interface to field devices across distances which
could produce high (greater than 2500V ) levels of ground potential rise (GPR)
during line-to-ground fault conditions. The 6KM passes the 1613specifications
for zero packet loss with fiber ports and with M12 ports used as indicated here.