Optelecom 9000 Series 9973-C, Installation And Operation Manual

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Set Up and Operation of the 9973-C
Set up and operation of the 9973-C cards consists of setting the high-speed cable length switch if necessary,
installing the unit into a Series 9000 chassis, and connecting the Cat5 jumper cable from the high-speed port
on the optical communications card to the 9973-C.
The high-speed port connector cable should be a shielded non-crossover RJ45 Cat5 type cable. If the cable
supplied is not long enough for your application, a longer shielded cable may be used to connect the high-
speed port on the 9973-C to the high-speed port on the fiber optic host card. If this cable is longer than
approximately 1 meter, then dipswitch S1-3 may need to be reset. TKH Security USA recommends that the
supplied cable be used.
T
ABLE
1 – D
IPSWITCH
1
Switch Position Function Factory Setting
1 Factory Use Only N/A
2 Factory Use Only N/A
3 Timing Adjustment Switch OFF
Setting S1-3 Dipswitch
If the 9973-C is located further away from the high-speed port on the transmission card than the supplied
cable will allow, a number of considerations must be taken into account:
 If it is necessary to replace the supplied cable, a high quality, shielded UTP cable should be used.
 If the length of the replacement cable length exceeds approximately 1 meter, dipswitch S1-3 may need
to be changed to the ON position. This adjusts the timing on the high-speed port interface of the 9973-C
to allow for the timing loss created by the longer cable.
The dipswitch should only be changed if the
Ethernet link appears to be marginal in operation.
 If the cable length exceeds 1 meter by a large factor, it may even be necessary to reset the switch back
to the original OFF position to adjust for an even further timing shift.
 Dipswitch S1-3 compensates
only
for the timing between the 9973-C on which the switch is located and
fiber transmission card connected directly to that high-speed port. If, at the other end of the fiber link, a
long cable is used between the 9973-C there and it’s mating transmission card, the dipswitch on the
9973-C at that end of the link may need to be changed as well.
Operation
Operation of the 9973-C is straightforward. Once connected, the link should pass 10 Mb Ethernet signals. The
9973-C Ethernet four-port switch is a simple unmanaged 10/100 Mb Ethernet switch. The backplane of this
switch will support 100 Mb operation on each port. Even though the switch supports 10/100 Mb Ethernet, the
fiber part of the link between the switches is limited to a throughput of 10 Mbps.