Verilink 300 (34-00199) Product Manual - Manual (Page 2)

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© 1997 TxPORT, All rights reserved. No part of this publication may be repro-
duced, transmitted, transcribed, stored in a retrieval system, or translated into
any language in any form by any means without the written permission of
TxPORT.
Reorder # 34-00199
2 nd Edition, October 1997
TxPORT shall not be liable for errors contained herein or for incidental or con-
sequential damages in connection with the furnishing, performance, or use of
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time and make changes in content without obligation to notify any person of
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Contents of this publication may be preliminary and/or may be changed at any
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pattern is received error free, the LED turns ‘green’. If any errors are detected, the LED
turns ‘red’. Normal DSU operation may resume at this time for DCE BERT testing.
Returning the test switch to ‘
NORM ’ transmits the V.54 deactivate code.
Normal (Unloop): When the test switch is moved from ‘ LL ’ back to ‘ NORM ’, the local
loopback is removed. When the test switch is moved from ‘ RL ’ back to ‘ NORM ’, the
unit sends unloop messages to the far end unit for six seconds and the remote loopback
is removed.
The following paragraphs describe other loops that may be initiated on the 300/ 310
units. Refer to the looping diagrams below for further information.
CSU Inband LLB: Each unit can be looped remotely by generating towards it a stan-
dard CSU line loopback code (00001 repeating for
≥ 5 seconds, framed or unframed).
Once looped, the received signal from the T1 facility (NET IN) is regenerated and
transmitted back to the T1 facility (NET OUT). The signal from the network is also
passed to the DTE port.
CSU Inband Unloop: Each unit can be unlooped remotely by generating towards it a
standard CSU line unloop code (001 repeating for
≥
5 seconds, framed or unframed).
T1.403 LLB: The 300 unit supports the T1.403 line loopback command (the FDL
LLB format is 00001110 11111111). Once looped, the received signal from the T1 fa-
cility (NET IN) is regenerated and transmitted back to the T1 facility (NET OUT). The
signal from the network is also passed to the DTE port.
T1.403 LLB Unloop: The 300 unit supports the T1.403 FDL line loopback unloop
command messages (00111000 11111111 repeating).
T1.403/54016 PLB: The 300 unit supports the T1.403 FDL payload loopback com-
mand messages (00111000 11111111 repeating).
T1.403/54016 PLB Unloop: The 300 unit supports the T1.403 FDL payload loop-
back unloop command message (00110010 11111111 repeating).
DTE NET
Local Loopback
DTE NET
Remote Channel Loop (V.54)
DTE NET
* Signal regeneration only
*
CSU Loop (FDL/PLB)
DTE NET
* Signal, frame, and CRC regeneration
*
CSU Line Loop (Inband or FDL/LLB)
Looping Diagrams