Section 4 User Interface Guide
Total Access 850 System Manual
114
© 2004 ADTRAN, Inc.
64203376L1-1B
L
EASED
M
ODE
T
ESTING
(
INITIATED
BY
THE
NETWORK
;
NOT
A
MENU
OPTION
)
For leased mode applications, the D channel is typically disabled on the UBR1TE. Without the D channel,
standard ISDN loopbacks by way of the EOC are not available across the T1 carrier system. For this
situation, the UBR1TE responds to independent network-issued OCU and CSU latching loopback
sequences for B1 and B2, when configured as Adjacent-to-Customer. Upon receipt of an OCU latching
loopback sequence, the UBR1TE initiates a bilateral loopback for the B channel under test. Upon receipt of
a CSU latching loopback sequence, and provided the U-interface is terminated by an NT1/TA, the
UBR1TE issues an EOC NT1 loopback for the appropriate B channel. In both tests of the OCU and the
CSU loopbacks, the other B channel is not affected. The UBRTE supports simultaneously testing both B
channels. The OCU and CSU latching loopbacks are enabled by the following:
ADDR1 (
LOCAL
L
PBK
)
ADDR2
ADDR3
ADDR4
NT1
Loopbacks in the Network-to-Customer direction initiate from
either the ISDN switch or the test menus. If a DS0 digital test
set is connected to the bantam connector on the front of the
module, data from the test set provides the 64 kbps test
pattern used in testing B1 or B2. If no test set is connected, an
internally generated 2074 test pattern is used. When initiating
loopbacks from the UBR1TE Module, the downstream
direction is automatically selected based on the card position
in the network. These tests are only valid for the
Adjacent-to-Customer circuit position. Use
ADDR2
to test an
ADTRAN U-Repeater deployed from the UBR1TE.
T
X
INTO
C
ARRIER
A point-to-point (straight-away) test initiated toward the T1
carrier interface. The internal 2047 test pattern generator is
used to verify the performance of the bearer channel. This test
is valid for all network configurations.
T
X
INTO
L
OOP
A point-to-point (straight-away) test initiated toward the
U-interface. The internal 2047 test pattern generator is used to
verify the performance of the bearer channel. This test is valid
for all network configurations.
B
ILATERAL
L
PBK
Loops toward both the U-interface and the T1 carrier network.
Summary of Contents for Total Access 850
Page 14: ...Table of Contents Total Access 850 System Manual 14 2004 ADTRAN Inc 64203376L1 1B ...
Page 16: ...Section 1 System Description Total Access 850 System Manual 16 2004 ADTRAN Inc 64203376L1 1B ...
Page 22: ...Section 1 System Description Total Access 850 System Manual 22 2004 ADTRAN Inc 64203376L1 1B ...
Page 224: ...Section 5 DLP 4 Total Access 850 System Manual 224 2004 ADTRAN Inc 64203376L1 1B ...
Page 232: ...Section 5 DLP 6 Total Access 850 System Manual 232 2004 ADTRAN Inc 64203376L1 1B ...
Page 236: ...Section 5 DLP 7 Total Access 850 System Manual 236 2004 ADTRAN Inc 64203376L1 1B ...
Page 244: ...Section 5 DLP 10 Total Access 850 System Manual 244 2004 ADTRAN Inc 64203376L1 1B ...
Page 252: ...Section 5 DLP 13 Total Access 850 System Manual 252 2004 ADTRAN Inc 64203376L1 1B ...
Page 256: ...Section 5 DLP 14 Total Access 850 System Manual 256 2004 ADTRAN Inc 64203376L1 1B ...
Page 264: ...Section 5 DLP 16 Total Access 850 System Manual 264 2004 ADTRAN Inc 64203376L1 1B ...
Page 278: ...Section 6 ADTRAN Utilities Total Access 850 System Manual 278 2004 ADTRAN Inc 64203376L1 1B ...