
Configuring BayStack DSU/CSU Services
117021-A Rev. A 4-3
Setting the Option Mode
The DSU/CSU module supports communication to 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 DDS1-56KBPSs when connected to a DDS1
56-Kb/s line. Select CC-64KBPS when connected to a Clear Channel 64-Kb/s
line.
By default, the Option Mode is set to DDS1-56KBPSs.
Selecting the Transmit Clock Source
The Transmit Clock Source determines the default transmit timing (clock) source
for transmitting data to the network. You can set the DSU/CSU clock source as
• 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.
The Transmit Clock Mode is set to Slave by default. Note that there can be only
one clock source on a DDS line.
Enabling or Disabling the 64K Transmit Monitor
This parameter is valid only when the Option Mode parameter is set to
CC-64KBPS. When enabled, 64K Transmit Monitor suppresses data to prevent
unintended duplication of a network control code. For example, user data that
includes the text of a loopback control code could place the remote end of the
connection into a loop.
Site Manager: Option Mode parameter: page A-7
Site Manager: Transmit Clock Source parameter: page A-7
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