This chapter describes the commands available for configuring a DDS CSU/DSU module in your router. It includes the following topics:

DDS CSU/DSU Features

• Integrated Channel Service Unit (CSU) and Data Service Unit (DSU).

• 56 Kbps DDS (DDS-PRI, 56 Kbps loop speed)

• 64 Kbps Clear Channel DDS (CC-64K, 72 Kbps loop speed)

Data Link and Signalling Features

• High-level Data Link Control (HDLC) framing

• Point-to-Point Protocol (PPP)

• Frame Relay LAN Emulation (FRLANE), and Frame Relay Virtual Circuit (FRVC) data-link layers

• CSU loopback for 56K DDS and 64K Clear Channel DDS

• DSU loopback for 56K DDS

• Secondary DDS channel

• Synchronous Data Link Control (SDLC) framing

• Switched 56K operation

• V.54 loopback or latching loopback operation

Displaying the DDS Prompts

To display the DDS Config <NET-#> prompt,

1. To see a list of devices, enter list devices at the Config> prompt. To see a list of interfaces, enter list interfaces at the Config> prompt.

2. Enter the network command to display the circuit configuration prompt. The network number is the number of a DDS interface.

Config>network
What is the network number [0]? 2
Circuit Configuration

Circuit Config <NET-2>

3. Enter sl to display the serial line prompt.

Circuit Config <NET-2> sl
Serial Line Configuration
Serial Config <WAN2> 

4. Enter dds at the Config <WAN2> prompt.

Serial Config <WAN2> dds
DDS user configuration

DDS Config <WAN2>

1. To see a list of devices, enter list devices at the Monitor> prompt.To see a list of interfaces, enter list interfaces at the Monitor> prompt.

2. Enter network followed by the number of the interface you want to monitor.

Monitor>network 2
Circuit <NET-2>

3. Enter sl at the Circuit <NET-#> prompt.

Circuit <NET-2>sl
Serial Line Console
Serial Console <WAN2>

4. Enter dds at the Serial Console <WAN2> prompt.

Serial Console <WAN2> dds
DDS user console

DDS <WAN2>

Press Space twice after you type a command to display the available parameters for each command. Enter help for information about using the command line interface.

[C] means the command is available at the DDS Config <NET-#> prompt.

[M] means the command is available at the DDS <WAN#> prompt.

Table 2 DDS Commands

Command	Function
Disable [M]	Disables back-to-back-master.
Enable [M]	For testing purposes, enables the DDS module to be master and provide clocking.
Exit [C]	Returns to the previous prompt.
List [C]	Lists the configuration of the DDS interface.
Parameters [M]	Displays current runtime configuration of the DDS module.
Set [C]	Configures the DDS CSU/DSU.
Statistics [M]	Displays statistics for the DDS module.

Disable [M]

Syntax: disable

back-to-back-master

Enable [M]

Syntax: enable

back-to-back-master

Exit [C]

Syntax: exit

Circuit Config <NET-1>

Syntax: list

Channel speed: 56K Primary

Syntax: parameters

DDS Module parameters: 

Back-to-back-master enabled

By default, DDS uses 7 data bits, which is called 56K primary

If your service provider's line uses B8ZS (Bipolar with Eight Zero Substitution) signaling, set the speed to 64K clear channel, which means the software uses 8 data bits per character.

DDS does not detect an incorrect value of this setting, so you need to make sure the speed is set in accordance with your service provider's configuration.

Syntax: set channel-speed

56K-primary

64K-clear-channel

Channel Speed (56/64) [64]? 

Example: statistics

          DDS Line Statistics   

Invalid Bipolar Violation        0
Out of Sync:                     0
Out of Frame:                    0
Unassigned Mux Code:             0
Unmatched Code:                  0
Loop Currrent Lost:              0
Receive Signal Lost:             0