ADTRAN 1200223L1, User Manual

Page: 31 / 44

Chapter 3. Operation
61200223L1-1 T3 Module User Manual 3-15
Figure 3-15. Network Loopback Test
Prt Read security: 5
Displays the port number.
Loc LB
(Local Loopback)
Write security: 4; Read security: 5
Causes loopback on near-end port. Includes the following
options:
Line — Loopback without regenerating framing
Payld — Payload loopback - framing and clocking are
regenerated. (See Figure 3-15 on page 3-15.)
Remote LB
(Remote
Loopback)
Write security: 4; Read security: 5
Sends loopback code to remote CSU. Includes the
following options:
•
ANSI FDL Line (Requires ESF mode)
•
ANSI FDL Pyld (Requires ESF mode)
•
AT&T Inband line
Pattern Write security: 4; Read security: 5
Test pattern to be transmitted out the port. Includes the
following options:
All ones — framed ones
All zeros — framed zeros
QRSS — pseudorandom pattern with suppression of
excess zeros.
QRSS/RLB
Results
(Test Pattern
Results)
Write security: 4; Read security: 5
Indicates sync and errors of received data pattern.
Clr
(Clear Test Pattern
Results)
Write security: 4; Read security: 5
Clears error counters on test pattern results menu.
Inj
(Inject Test Pattern
Error)
Write security: 4; Read security: 5
Injects errors into transmitted test pattern.
T3 Module
T1 Payload Loopback
T1 Line
Loopback
T1 Framer #1
M13
Mux
T3
Front
End
T3 Line
T1 Framer
#28
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T3 Line
Loopback