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4. TESTING
The 9004 U-BR1TE II responds to the B1, B2 and 2B+D
loopbacks as specified in TR-NWT-000397. This allows
an upstream network element, such as the ISDN switch,
U-BR1TE, or U-interface testers to initiate industry
standard EOC loopbacks. The faceplate can aid in
circuit turn-up and, in case of equipment malfunction,
sectionalize the network fault. For local test access, a
DS0 logic tester (equivalent to a TPI 108/109) can be
used along with the ten position Address Select Knob,
TEST pushbutton, and B1/B2 switches to perform local
and downstream loopbacks. See Figures 1 and 4 for
location identification. In addition, non-intrusive local
performance monitoring information is available through
the faceplate LEDs. The faceplate LEDs provide the
U-BR1TE operational and test status indications.
U-BR1TE II
1425020L2
TEST
LBK
6
5
4
3
B1
NM
TEST
TST ERR
LP
Figure 4. 9004 U-BR1TE II Faceplate
Loopbacks in the network-to-customer direction can be initiated
from the faceplate of the 9004 U-BR1TE II. Faceplate initiated
loopbacks are unobtrusive to unused channels. Loopback on
a single B channel will not interrupt the other channels. The
2B+D loopback is service affecting for the customer.
Faceplate indicators display the various conditions
occurring with respect to the 9004 U-BR1TE II. Table A
lists the faceplate indicators and their error messages.
61425.020L2-5A
CTX
LTX
NT1
1
2
B2
PTRN
CR
ACT
Section 61425020L2-5, Issue 1
The ten position rotary Address Select Knob (SW3)
determines which downstream network element is to be
looped. See Figure 1 for switch location and Table C for
setting descriptions.
Table C. Rotary Switch Options
D
s i
p
a l
y
A
D
1
A
d
d
e r
s s
#
, 1
A
D
2
A
d
d
e r
s s
#
, 2
a
w
a
y
A
D
3
A
d
d
e r
s s
#
, 3
d
o
w
n
t s
e r
a
m
A
D
4
A
d
d
e r
s s
#
, 4
A
D
5
A
d
d
e r
s s
#
, 5
d
o
w
n
t s
e r
a
m
A
D
6
A
d
d
e r
s s
#
, 6
L
P
B
K
L
o
o
p
b
a
c
, k
h t
e
s
e
e l
c
e t
L
o
o
p
b
a
c
s k
a
n
d
n
e
w t
o
C
R
T
X
C
a
r r
e i
t r
a r
n
L
P
T
X
L
o
o
p
t
a r
n
s
N
T
1
N
T
, 1
a
d
d
e r
Selecting the B1/B2 DIP switch (SW4-1) sets the bearer
channel. The NM/PTRN switch (SW4-2) selects between
normal and internal 2047 pattern generator local test.
The Test pushbutton (SW5) activates and deactivates
the test. See Figures 1 and 4 for switch locations.
The following describes local test access testing for local
or remote loopbacks.
1. Configure the DS0 tester for near logic and
connect the Rx/Tx cables to the 91441 test
adapter Bantam jack. Connect the clock cord
between the DS0 tester and the 91441 test
adapter. Finally, insert the 91441 paddle jack
test interface into the U-BR1TE faceplate jack.
2. Using the ten position rotary Address Select
Knob (SW3), select the desired address of the
downstream unit to be tested. See Table C for
address information.
3. Select the appropriate bearer channel using the
B1/B2 DIP switch (SW4-1).
4. To activate the loopback test, press the TEST
pushbutton (SW5).
n I
e t
p r
e
t r
t a
o i
n
a
d
d
e r
s s
f o
h t
s i
u
n
t i
h t
e
n
e
t x
d
o
w
n
t s
e r
a
m
u
n
t i
h t
e
s
e
c
o
n
d
u
n
t i
h t
e
t
i h
d r
u
n
t i
d
o
w
n
t s
e r
a
m
h t
e
o f
r u
h t
u
n
t i
h t
e
f i f
h t
u
n
t i
d
o
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n
t s
e r
a
m
o f
c r
e
s
h t
s i
u
n
t i
o t
o l
o
p
b
a
k c
d
B
1
r o
B
2
c
h
a
n
n
e
. l
o
c c
r u
n i
b
o
h t
h t
e
c
u
s
o t
m
r e
k r
i d
e r
t c
o i
n
. s
s
m
, t i
n i
h t
e
c
a
i r r
r e
i d
e r
t c
o i
m
, t i
n i
h t
e
o l
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p
i d
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t c
o i
n
s s
f o
h t
e
N
T
1
n
5
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