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Configuring WAN Line Services
4-4
308648-14.00 Rev 00
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. Table 4-2
lists the Telco service options.
Using the BCC
To change the option mode, navigate to the dsucsu prompt (for example,
box
;
dsucsu/1/1
) and type:
telco-service
variable
For example:
dsucsu/1/1#
telco-service cc64kbps
Using Site Manager
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 (external, network)-- Indicates that the router sets the clock; an
internal oscillator in the DSU creates the clock for a private-wire
configuration.
Slave (internal) -- Indicates that the incoming data stream sets the clock; a
PLL internal to the DSU will recover and synchronize the DSU clock.
Table 4-2. Telco Service Options
BCC Option Site Manager Option Descriptions
dds156kbps DDS1-56KBPS The default; use when connected to a DDS1
56 Kb/s line.
cc64kbps CC-64KBPS Use when connected to a CC 64 Kb/s line.
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