Telenetics MIU9.6FPD Manual Do Utilizador

 

MIU9.6FPD Installation, Operation & Diagnostics 

April 25, 1998 

Page 13

 

The following pages provide hardware techniques for diagnosing 
communication problems and thereby isolating the problem at the local 
modem, the remote modem or the interconnecting line. 
 
 
(a)  LOCAL ANALOG LOOPBACK (Figure 2) 
 

Requires a loop back cable with a built-in circuit for line loss to 
simulate a typical leased line condition  (See Figure 3). 
 
Connect the loop back cable to the RJ11 connector on the modem 
under test. 
 
Set Dip Switches as follows… 
 
Switch 7 = OFF 

4-Wire 

Switch 9 = ON  

Soft Carrier Turn Off Enabled 

Switch 1 = ON  

Transmit (TxA) Signal Level = 0dBm 

Switch 3 = ON  

Receive (RxA) Signal Level = –33dBm 

Switch 6 = OFF 

Switched Carrier 

Switch 4&5 = ON 

RTS/CTS Delay = 50ms 

 
Test 1:  RTS/CTS Analog Control 
 
 

Set RTS “ON” and check that CD (Carrier Detect) turns 
“ON”. 

 
 

Turn RTS “OFF” and ensure that CD turns “OFF” 

 
 

With RTS “ON”, run a test message at TxD and verify that 
the same message is received at RxD with no data errors. 

    
Test 2:  Transmit Signal Power & Receive Levels 
 

 

Set Dip Switch 1 OFF (TxA = -10dBm) 

 

CD will be OFF. 

 

Change Dip Switch 1 to ON (TxA = 0dBm) 

 

CD should now be ON.