| OID | 1.3.6.1.4.1.351.110.4.5.1.1.1.6 | 
  | Module | CISCO-WAN-FR-X21-MIB (CISCO) | 
| Nom | x21LineSendCode | 
| Acces | readwrite | 
| Status | current | 
| Description | This variable indicates what type of  code  is
              being sent across the X.21/HSSI interface by the
              	 device. The values mean:
              	 
              	x21NoCode: No loopback.
              
              x21SendLoopACode:
                 		Start sending Loop A code. Valid only if
              		the backcard is HSSI and the line-type is DTE.
              		This command loops the line module of the remote
              		device.
              
              x21SendLoopBCode:
                 		Start sending Loop B code. Valid only if the
              		backcard is HSSI and the line-type is DTE.
              		This command loops the digital section of the
              		remote device.
              
              x21SendLocalLoopCode:
                 		Start sending CCITT X.21 Loopback Type 3 code.
              		This is valid only if the backcard is X.21 type.
              
              x21SendRemoteLoopCode:
                 		Start sending CCITT X.21 Loopback Type 2 code.
              		This is valid only if the backcard is X.21 type.
              	
                    	x21SendUnLoopCode:
                 		Sending a loopback termination request.
              		Valid for both HSSI and X.21 lines.
              
              	To execute any of the loop-codes the x21LineLoopbackCommand
              	should be set to x21RemoteLoop.
              	Once the x21SendUnLoopCode succeeds the x21LineLoopbackCommand
              	would transition back to x21NoLoop state.
              
              	Default is x21NoCode. | 
| Syntaxe | Enumeration (1-x21NoCode, 2-x21SendLoopACode, 3-x21SendLoopBCode, 4-x21SendLocalLoopCode, 5-x21SendRemoteLoopCode, 6-x21SendUnLoopCode) |