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Configuring DS3 Interfaces

You can create a DS3 interface on a SONET path only if the SONET path speed is OC1 and there are no other objects on the SONET path. DS3 interfaces can be channelized or unchannelized. When you create a channelized DS3 interface, twenty-eight DS1 interfaces are created. An unchannelized DS3 interface includes HDLC settings.

Customers profiles are not listable from DS3 interfaces on cOC3/12 modules.

For information about configuring DS1 interfaces, see Configuring a DS1 Interface in Chapter 15, Configuring T3/E3 and T1/E1 Modules.

To create a DS3 interface on a SONET path:

  1. Select an OC1 SONET path.
  2. Right-click, select Create, and click DS1 Interface.

The Create DS3 Interface dialog box appears.











 NOTE: If DS1 interfaces are already mapped to the OC1 SONET path, you must unmap the interfaces before you create a DS3 interface.
  1. Set the DS3 interface parameters (Table 35).
    2. 



     Table 35:  DS3 Interface Parameters 
    

     Parameter
    		

     Description
    		

    

     Admin Status
    
    		

      
  
    •  Up—Module is enabled
      • 
  
    •  Down—Module is disabled
      • 

    
    		

    

     Transmit Clock
    
    		

      
  
    •  Loop Timing—Device receives its clocking from a network source
      • 
  
    •  Internal Module—Device receives its clocking from a network source
      • 
  
    •  Internal Chassis—Device receives its clocking from the configured system clock
      • 

    
    		

    

     Channelization
    
    		

      
  
    •  Channelized
      • 
  
    •  Unchannelized
      • 

    
    		

    

     Framing Type
    
    		

     Method for distinguishing digital channels that are time-division multiplexed together
    

      
  
    •  M23—M23 multiplexer framing
      • 
  
    •  CbitParity—C-bit parity framing
      • 

    
    		

    

     Loopback Mode
    
    		

      
  
    •  No Loopback—Disables loopback mode
      • 
  
    •  Line Loopback—Loops the data toward the network; connects the received network signal directly to the transmit network signal line.
      • 
  
    •  Internal Loopback—Loops the data toward the interface of the module; connects the local transmitted signal to the local received signal.
      • 

    
    		

    

     HDLC Settings 
    		

     (Appears only if Unchannelized was selected during initial creation; visible later during Configure mode only.)
    
    		

    

     CRC Checking Enabled
    
    		

     Cyclical redundancy check (CRC) is an error-checking technique
    
    		

    

     Data Inversion
    
    		

     Provides ones density, a method for inserting 1s in the data stream. If you enable data inversion on your device, be sure it is also turned on at the other end of the line on the destination device.
    
    		

    

     MTU
    
    		

     Maximum transmission unit; the largest size allowed for a data packet transmitted over a transmission line; range 4-32763; default 1024 bits
    
    		

    

     MRU
    
    		

     Maximum receive unit; the largest size allowed for a data packet received over a transmission line; range 4-32763; default 2048
    
    		

    

     CRC Algorithm
    
    		

     Cyclical redundancy check (CRC) can be set to 16 bits or 32 bits; default 16 bits
  2. Click OK.

The DS3 interface and related DS1 interfaces are created.

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