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Configuring BayStack DSU/CSU Services

117345-B Rev. 00

4-3

The following sections describe the configuration options for the internal

BayStack DSU/CSU:

Setting the Option Mode

The DSU/CSU module supports communication with either 56 Kb/s digital data

system (DDS) or 64 Kb/s clear channel (CC) service. The data rate of the

DSU/CSU must match the network service.

Use the Option Mode parameter to identify the type of Telco service to which the

DSU/CSU is connected. Select DDS1-56KBPS when connected to a

DDS1 56 Kb/s line. Select CC-64KBPS when connected to a CC 64 Kb/s line.

By default, the Option Mode parameter is set to DDS1-56KBPS.

See the Option Mode parameter on page A-8

for information.

Selecting the Transmit Clock Source

The Transmit Clock Source parameter determines the default transmit timing

(clock) source for transmitting data to the network. You can set the DSU/CSU

clock source as follows:

• Master -- Indicates that the router sets the clock; an internal oscillator in the

DSU creates the clock for a private-wire configuration.

• Slave -- Indicates that the incoming data stream sets the clock; a PLL internal

to the DSU will recover and synchronize the DSU clock.

For a Telco network, set both ends to Slave. For a private-wire configuration, set

one end to Master and the other end to Slave.

Section Page

Setting the Option Mode

4-3

Selecting the Transmit Clock Source 4-3

Enabling or Disabling the 64K Transmit Monitor 4-4

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Avaya Configuring WAN Line Services Manual do Utilizador Página 85