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This setting depends upon the distance between the devices on either end of
the E1 line. For shorter distances, use DSU. For longer distances, use CSU.
This information should be provided by your service provider.
9
From the Line Length list, select the line length.
You can configure line length only when Line Mode is DSU. This setting
depends upon the length of the cable connecting the devices on each end of a
E1 line.
10
From the Transmit ClockSource list, select Loop Timing.
When you select Loop Timing, the remote end provides the clock source. Check
with your service provider.
11
Click Apply.
Variable definitions
This table describes the variables used to configure the T1/E1 interface.
Variable
Interface
Interface Type
Framing
Line Mode
End
Value
The T1/E1 controller.
The interface type for the given interface.
Options:
T1
E1
The default value is T1.
If you change the interface type, you must
reboot the system before configuring the
remaining parameters.
The Framing Type for the T1/E1 data line.
Options for E1:
E1—a single E1 frame consists of 256
bits, grouped into 32 octets or time slots.
The timeslots are numbered 0 to 31.
E1CRC
The default value is E1CRC.
The Line Mode.
Options:
Channel Service Unit (CSU)—select if
cable length is equal to or more than 655
feet.
Data Service Unit (DSU)—select if cable
length is less than 655 feet.
The default value is CSU.
WAN configuration
31
Configuration Guide
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