Black Box MWU2000-V35 Manual De Usuario

 

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 

 
 

 
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.