NMC-RX 7.2.x User Guide, Vol. 1 > Configuring T3/E3 and T1/E1 Modules > Configuring a Line Interface

Configuring a Line Interface

You can configure line interfaces on CT3, T3, and E3 line modules. CT1 and CE1 line modules do not have line interfaces.

To configure a line interface:

1. In the Instance Explorer, select the line interface that you want to configure.
2. Right-click, and select Configure.

The Config tab appears in the work area.

NOTE: Fields vary depending on the type of CT3, T3, and E3 line module that you are configuring. (See the following examples and Table 54.)

3. Set the line interface parameters (Table 54).

 Table 54:  Line Interface Parameters (CT3, T3, and E3)  

 Parameter
 Description
 CT3
 T3
ATM
 T3
FRAME
 E3
ATM
 E3
FRAME

 Admin Status


  
 Up—Interface is enabled by the administrator
  
 Down—Interface is disabled by the administrator


 x

 x

 x

 x

 x


 Transmit Timing

 Specifies the type of timing:

  
 Local Timing—System receives its clocking from an internal source
  
 Module Timing—System receives its clocking from a network source
  
 Chassis Timing—System receives its clocking from the configured system clock


 x

 x

 x

 x

 x


 Length (meters)

 Specifies the cable length. The length of cable determines power requirements:

  
 0 to 224—Use for low-power output
  
 225 to 450—Use for high-power output


 x

 -

 x

 -

 -


 Framing Type


  
 M23—M23 multiplexer framing


 x

 x

 x

 -

 -


 


  
 M23Plcp—M23 with PLCP framing


 -

 x

 -

 -

 -


 


  
 C-Bit Parity—C-bit parity framing


 x

 x

 x

 -

 -


 


  
 CbitParityPlcp—C-bit parity with PLCP framing


 -

 x

 -

 -

 -


 


  
 G832—G.832 ATM direct mapping


 -

 -

 -

 x

 x


 


  
 Framed—Framed mode


 -

 -

 -

 x

 x


 


  
 PLCP—PLPC framing


 -

 -

 -

 x

 -


 Loopback Mode


  
 None—No loopback specified (default)
  
 Network Payload—Loops the data toward the network
  
 Network Line—Sets a local loopback at the payload controllers
  
 Local—Loops back outgoing data from the transmit to the receive side


 x

 x

 -

 x

 x


 Cell Scramble

 Enables cell scrambling on the interface

 -

 x

 -

 x

 -


 DSU Settings
 

 

 

 

 


 Mode

 None, Larscom, Digital Link

 -

 -

 x

 -

 -


 Bandwidth Limit

 Range: 0-44210

 -

 -

 x

 -

 -


 Scramble Mode

 Enables cell scrambling on the interface

 -

 -

 x

 -

 -


 HDLC Settings
 

 

 

 

 


 CRC Checking Enabled

 Enables cyclic redundancy check (CRC), an error-checking technique that uses a calculated numeric value to detect errors in transmitted data

 -

 -

 x

 -

 x


 CRC Algorithm

 Cyclic redundancy check algorithm used during error checking (16 bit or 32 bit)

 -

 -

 x

 -

 x


 Data Inversion

 Enables data stream inversion for the interface

 -

 -

 x

 -

 x


 MTU

 Maximum transmission unit size for the interface. Coordinate this value with the network administrator on the other end of the line; default 1500

 -

 -

 x

 -

 x


 MRU

 Maximum receive unit size for the interface. Coordinate this value with the network administrator on the other end of the line; default 1500

 -

 -

 x

 -

 x


 

 

 (x=parameter available on module)



 

4. Click Save.

Your configuration settings are saved.