SMW QUAD-LINK - Troubleshooting

4. Troubleshooting
A) Many problems encountered can be associated with
impurities on the ber ends.
If your unit’s RF/ L-band LED indicators are RED,
please start by cleaning the ber ends at both ends
of the cable, see (A) above and also other ber
contacts in the ber link system, (if used). See
https://www.youtube.com/watch?v=lK_ex9Ip94Q
Check status LEDs (1 and 2 g. 3) for normal operation
indication. If Error (RED) is indicated or no indication at
all, rst check the DC power supply for correct voltage
and polarity at the corresponding unit’s DC input.
There is no micro processor or software inside the units.
There are no user serviceable parts or fuses inside.
B) If there is still a problem, check polarity of Fiber cables
if other cables than SMW cables are used. See Fig. 9.
NOTE! Q-ODC ”A” is connected to SC-APC ”B” and
vice verse
On the Transmitter only the left ferrule (B in cable) seen
from the front is used normally.
On the Receiver only the right ferrule (A in cable) seen
from the front is used normally.
7
Service
There are no user serviceable parts inside.
For factory service, contact SMW for an RMA number or
via www.smw.se before returning any material.
Materials returned without an RMA number will be
refused. Standard warranty is 36 months.
Rx ber input
(right ferrule)
Mark
Fig. 9
A
B
A
B
Front panel LED indicators
Error LED indications:
RF / L-band LEDs (1, g. 3):
Red: Optical Power Error. Indicates:
EITHER
- Too high attenuation in the optic light path,
such as cable too long or impurities on the
ber end. Clean ber ends with a ”Click pen”,
see (A) above and check cable length vs
specication.
OR
- Too low laser power out internally, self-
diagnostic. Return to factory for repair.
Yellow/Orange: Optical Power Error
Optical is locked but low level.
Tx ber output
(left ferrule)
The RF level from the QuadLink Receiver depends on
two things:
1. Optical attenuation
2. Input level on the QuadLink Transmitter
The formulas are:
Rx channel power = -6dBm - (2*opt._att) - (log10(num-
ber_ of_channels)*10)
If RF input level on Quadlink Transmitter is less than
-15dBm (sum of all carriers):
Rx channel power = Tx_input_level + 9 - (2*opt._att.) -
(log10(number_ of_channels)*10)