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Table 3. Pinout Connectors for RJ-48 TI Interface
P
N I
N
A
M
E
1
R
1
-
I R
N
G
1
2
T
1
-
T
P I
1
3
U
N
U
S
E
D
4
R
-
I R
N
G
5
T
-
T
P I
6
7 ,
8 ,
U
N
U
S
E
D
Table 4. Pinout Connectors for RJ-48 FTI Interface
P
N I
N
A
M
E
1
R
-
I R
N
G
2
T
-
T
P I
3
U
N
U
S
E
D
4
R
1
-
I R
N
G
1
5
T
1
-
T
P I
1
6
7 ,
8 ,
U
N
U
S
E
D
FACEPLATE LED
The faceplate LEDs labeled NETWORK T1 and
FRACTIONAL T1 provide status using a color coded
message format. Refer to Table 5.
4. TESTING
The TA 750 BCU provides a variety of test options
for both the Network T1 and DS0 access modules.
The faceplate of the BCU provides a bantam jack for
local T1 test access. DS0 test access for the digital
access modules (OCU DP, DS0 DP, U-BR1TE) is
provided via bantam jacks on the faceplate of each
unit.
61175012L2-5D
D
E
S
C
R
P I
I T
O
N
R
c e
i e
e v
a d
a t
f
o r
m
N
e
w t
o
k r
D
S
1
R
c e
i e
e v
a d
a t
f
o r
m
N
e
w t
o
k r
D
S
1
-
T
a r
s n
m
t i
a d
a t
o t
N
e
w t
o
k r
D
S
1
T
a r
s n
m
t i
a d
a t
o t
N
e
w t
o
k r
D
S
1
-
D
E
S
C
R
P I
I T
O
N
T
a r
s n
m
t i
a d
a t
o t
w
r a
s d
D
S
X
i
t n
r e
a f
e c
T
a r
s n
m
t i
a d
a t
o t
w
r a
s d
D
S
X
i
t n
r e
a f
e c
-
R
c e
i e
e v
a d
a t
f
o r
m
D
S
X
i
t n
r e
a f
e c
R
c e
i e
e v
a d
a t
f
o r
m
D
S
X
i
t n
r e
a f
e c
-
Section 61175012L2-5, Issue 4
Table 5. LED Indication
L
E
D
C
o
n
d
t i
o i
n
O
R
e
N
e
w t
r o
/ k
F
a r
i t c
n o
l a
Y
l e
o l
: w
T
1
G
r
e e
l F
s a
i h
g n
G
r
e e
Faceplate Bantam Jack
The faceplate bantam jack provides a means to
monitor the network T1 connected to the rear of the
TA 750 chassis. The jacks accept standard 310-type
bantam plugs. Figure 3 displays where the bantam
jacks monitor the T1.
Faceplate TEST connector
The faceplate DB-9 female TEST connector provides
the necessary clock output required by standard DSO
Logic Test equipment such as a TPI 108/109 test set.
Specifically, the TEST connector outputs 8 kHz and
64 kHz clock reference signal. Figure 4 illustrates the
DB-9 TEST connector.
DS0 test equipment is used to test DS0 access
modules such as the OCU DP, DS0 DP, or U-BR1TE.
Once the test equipment is connected to the reference
clock source, individual tests can be performed on
DS0 access modules using the faceplate bantam jacks
on each unit.
T1 Loopbacks
The TA 750 supports several T1 loopbacks via the
craft interface. These loopbacks include:
•
Initiating a remote payload or line loopback
command (ESF mode only).
•
Responding to a remote payload or line
loopback command (ESF mode only).
•
Responding to a remote CSU loopback
command.
Figure 3 displays where the various loopbacks occur
in the TA 750 BCU circuitry.
Self Test
The BCU goes into self test when inserted into an
active TA 750 chassis. The self test checks internal
BCU circuitry. A failed test causes the faceplate
NETWORK T1 LED to blink red.
D
e
s
c
i r
t p
o i
n
: f f
N
o
o p
w
. r e
: d
U
n
t i
n i
R
d e
l A
r a
m
T (
1
o d
w
n
r o
o n
c t
n o
e n
t c
d e
. )
R
c e
i e
i v
g n
Y
l e
o l
w
l A
r a
m
f (
r a
e
d n
n u
t i
n i
R
d e
l a
r a
m
: n
N
r o
m
l a
O
p
r e
t a
o i
. n
: n
N
e
w t
o
k r
T
1
n i
T
e
. t s
. )
5
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