Table of Contents
Advertisement
I
C
NITIATING
The Avidia system supports loopbacks that enable you to test the data communication path
between a card in the Avidia system and another device with the same transmission. You can
run these loopbacks on DS1/DSX-1, DS3, and OC3 lines. The end-points for these tests are the
near-end, which is the local Avidia card, and the far-end, which is the device (this could be
another Avidia card) that is the remote end for the test.
When you initiate a loopback test on a data communication path, normal service is
interrupted for that path until the test is cancelled. The system is then returned to normal
operation.
The following table lists supported loopbacks.
Loopback
Card(s)
Type
Supported
Local
OC3
DS1
DS3
Line
OC3
DS1/DSX-1
DS3
Payload
DS1/DSX-1 For this loopback, framing for the DS1/DSX-1 port must be set to ESF.
Remote
DS1/DSX-1
DS3
See the following sections to initiate loopbacks for specific line card types:
"Initiating OC3 Loopbacks" on page 346
"Initiating DS1 Loopbacks" on page 346
"Initiating DS3 Loopbacks" on page 347
Avidia System Configuration and Management User Manual
OMMUNICATION
Description
For this loopback, the signal is looped back within the line card at the
transceiver.
For this loopback, the signal is received at the line interface and is looped
back through the transmitter. The near-end interface receives the
loopback from the far-end device. You can activate this test either from
the near-end or far-end.
A line loopback tests the complete signal for the port, including channels
that are blocked by the user.
The DS1/DSX-1 card loops the payload (192 bits) through the receive
section (including the framer) and to the transmit section, returning the
payload and the newly generated ESF framing.
For this loopback, the signal is sent to the far-end where it is looped
back. This loopback tests the entire data path to the far-end.
Chapter 17: System Maintenance and Administration
P
L
ATH
OOPBACKS
345
Advertisement
Table of Contents
