ADC AVIDIA SWD4573I1 User Manual
Page 447
Chapter 21: Configuring Network Services
Avidia System Configuration and Management User Manual
421
3
In the
Circuit Identifier
box, type a text string to identify the circuit.
4
In the
LBO/Equalization
box, do one of the following:
•
For a DS1 line, select the equalization (
0 dB
,
-7.5 dB
,
-15 dB
, or
-22.5 dB
)
•
For a DSX1 line, select the line length (
0 to 133 feet
(40 m),
133 to 266 feet
(81 m),
266 to 399 feet
(121 m),
399 to 533 feet
(162 m), or
533 to 655 feet
(200 m)).
5
In the
Line Code
box, select the type of coding on the line (
B8ZS
or
AMI
).
6
In the
Framing
box, select the type of line connected to the selected port (
Extended
SuperFrame DS1
or
AT&T D4 format DS1
).
7
In the
Transmit Clock Source
box, select the type of timing in use (
loopTiming or
localTiming
).
8
Use the Loopback box to initiate a communication path loopback for the port. See
“Initiating Communication Path Loopbacks” on page 563
9
In the
Cell Scrambling
box,
Enable
or
Disable
cell scrambling.
Enables or disables cell scrambling. Cell scrambling, used in Avidia, is not an ATM
defined format for DS1, but is implemented by many vendors. An ATM cell has two parts:
header and payload. Cell scrambling scrambles the payload so that it does not resemble the
header. In the event that an ATM network looses sync, it will attempt to synchronize on
what it sees as the cell header. In some cases, the cell payload can resemble the cell header,
so the network attempts to synchronize on the cell payload rather than the cell header.
Scrambling the cell payload precludes it from looking like a cell header. Choose to enable
or disable cell scrambling based on whether or not the ATM equipment in the network
supports cell scrambling.
10
Do one of the following:
•
To activate the new settings, click
Set
, then in the confirmation dialog click
Back
to
return to the
DS1 Configuration
window.
•
To cancel the new settings, click
Get
. You can only cancel the settings if you have not
clicked
Set
.