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Table 3. Latching Loopback Activation Sequence
S
e
q
u
e
n
c
e
B
F
F
F
F
u
u
u
u
n
n
n
n
t c
t c
t c
t c
o i
o i
o i
o i
n
n
n
n
F
u
n
t c
o i
n
C
e l
r a
e
i x
i t s
g n
T
a r
s n
l
o o
b p
c a
s k
p
o r
r g
X
0
1 1
d I
n e
i t
y f
e d
i v
e c
o t
L
o
p o
a b
e b
o l
p o
d e
o c
e d
X
0
0 0
X
1
1 0
X
0
1 1
X
1
0 0
P
e r
a p
e r
o t
l
o o
; p
L
o
p o
a b
e s
d n
M
A
P
o c
e d
L (
B
) E
a
t f
r e
0 3
b
t y
s e
X
1
1 0
A
i t c
a v
e t
F
r a
E -
o l
p o
a b
k c
F (
E
V
X
1
1 0
M
i
i n
m
u
m
f o
5 3
T
P I
b
t y
s e
a l
c t
i h
g n
l
o o
b p
c a
. k
X
=
D
o
t ' n
C
a
e r
b
t i
Table 4. Alternating Loopback Activation Sequence
S
e
q
u
e
n
c
e
F
F
F
F
u
u
u
u
n
n
n
n
t c
t c
t c
t c
o i
o i
o i
o i
n
n
n
n
F
u
n
t c
o i
n
A
i t c
e v
o l
p o
a b
k c
M
a
n i
a t
n i
o l
p o
a b
k c
a
d n
t
s e
f t
r o
t i b
r e
o r
s r
C
e l
r a
o l
p o
a b
k c
X
=
D
o
t ' n
a c
e r
t i b
• Pressing the TROCU-R LBK pushbutton once
will initiate a loopback at the TR DDS-DP
towards the customer. See Figure 6.
61433105L2-5D
N
u
m
b
r e
y
e t
C
o
d
e
R
R
R
R
R
e
e
e
e
e
c
c
c
c
c
e
e
e
e
e
v i
v i
v i
v i
v i
B
B
B
B
y
y
y
y
e t
e t
e t
e t
B
y
e t
i t i
n o
n i
M
i
i n
m
u
s e
( s
I T
) P
5 3
T
P I
b
0 1
0 1
k c
e s
e l
t c
M
i
i n
m
u
L (
S
) C
5 3
L
S
C
1 0
1 0
-
D
S
0
1 0
1 0
-
O
C
U
0 0
1 0
-
C
S
U
0 0
1 0
-
N
E I
k c
e
a n
l b
d e
M
i
i n
m
u
1
0 0
L
B
E
1 0
0 1
d n
v
i o
e c
M
i
i n
m
u
)
2 3
F
E
V
0 1
0 1
e r
u q
r i
d e
o t
d
s i
b a
e l
e
t s
b a
i l
R
e
c
e
v i
e
d
B
y
e t
s
o F
r u
o c
s n
c e
i t u
e v
b
t y
s e
p s
c e
i f i
d e
o l
p o
a b
k c
o c
e d
X
0
0 1
0 1
0 1
-
O
C
U
X
0
0 1
0 1
0 0
-
C
S
U
X
0
0 1
1 1
0 0
-
D
S
U
D
a
a t
y b
e t
a
e t l
n r
i t a
g n
w
o l
p o
a b
k c
o c
e d
e
a x
m
p
: e l
X
D
D
D
D
D
D
1
X /
0
0 1
0 1
0 1
o F
r u
o c
s n
c e
i t u
e v
a d
a t
b
w
h t i
u o
a t
e t l
n r
i t a
g n
o l
p o
o c
e d
Section 61433105L2, Issue 4
Channel Bank
f o
Alternating
MOS 9Ah/ASC 9Eh
e
e
e
e
e
d
d
d
d
d
s
s
s
s
s
m
f o
t y
s e
Channel Bank
m
f o
ASC 9Eh
b
t y
s e
Figure 5. DDS Trouble Codes
m
f o
b
t y
s e
m
f o
• Pressing the LBK pushbutton a second time
b
t y
s e
initiates a loopback at the TROCU-R towards the
4-wire DDS (CPE) interface. See Figure 7.
h s
d e
• Pressing the TROCU-R LBK pushbutton a third
time disables all current latching loopbacks
initiated by the TROCU-R LBK pushbutton.
f o
4. REMOTE PROVISIONING AND
h t i
DIAGNOSTICS
Control Protocol
t y
s e
a b
k c
Customer Premises
Open 2-wire Loop
TR
TR
DDS
DDS-R
DP
Customer Premises
ASC 9Eh
TR
TR
DDS
DDS-R
DP
DSU
Open 4-Wire Customer
Interface
DSU
5
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