Black Box MWU2000-X21 - Manual (Page 87)

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2.048Mbps Wireless Modem
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3. For X.21, RS-530 and V.35 configured as DCE External Clock or DTE, verify that:
• The end equipment is defined as DTE or DCE accordingly.
• The end equipment is connected to the unit.
• In the Counters and Tracers menu select Watch Alarms. Verify that the alarm monitor
checks that the clock rate setting of the end equipment matches the clock rate setting of the
unit.
4. For Fractional E1:
• Verify that the line coding selected (HDB3/AMI) matches the setting of the end equipment.
• Verify that echo cancellation is not activated on channel 0.
• In CAS (Channel Associated Signalling) systems, verify that echo cancellation is not activated on
channel 16.
• Check correct connection of the cable connecting the unit to the end equipment. Verify that the LOS
LED is not On.
• Check that the balanced/unbalanced configuration of the LIU module (jumpers setting)
matches the setting of the end equipment.
5. For Fractional T1:
• Verify that the line coding selected (B8ZS/AMI) matches the setting of the end equipment.
• Verify that the framing method configuration (ESF/D4) matches the setting of the end
equipment.
• Check correct connection of the cable connecting the unit to the end equipment. Verify that
the LOS LED is not On.
• Verify that the pulse shape setting matches the actual length of the cable connecting the unit
to the end equipment
Problem 4: There is a radio link and the LIU Operates, but the equipment does not
synchronize
Probable cause:
• Problem with the cable connecting the unit and the end equipment.
⇒ To check the cable connecting the unit and the end equipment:
1. From the Parameters menu, select Parameters Info. Screen.