Figure 4. Ds0 Bidirectional Loopback; Table 2. Led Indication - ADTRAN Total Reach DDS-DP 5 Series Installation And Maintenance Manual
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- Installation and maintenance manual (6 pages)
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Table 2. LED Indication
n I
d
c i
t a
r o
S
X
O
N
i
d n
c i
t a
s e
n o
h t
l e
c o
l a
a
d n
r p
p o
r e
e
d n
T (
R
D
S
Y
N
C
O
N
n i
i d
a c
e t
e b
w t
e e
t n
e h
T
R
D
D
S
R -
o c
s l i
a ,
d n
t o
o c
d n
i t i
n o
. s
N
E
C
R
C
O
N
n i
i d
a c
e t
n i
o c
i m
g n
a d
a
n b
r o
m
l a
i l
T
R
D
D
S
D -
F
E
C
R
C
O
N
n i
i d
a c
e t
c o
u c
i r r
g n
o t
R
c ;
e h
k c
o f
c
n o
i d
o i t
s n
c
F (
A
R
E
N
D
Q
M
O
N
n i
i d
a c
e t
D
s i
o c
n n
c e
h t
D
S
U
Y
e
o l l
w
n i
i d
c
s u
o t
m
r e
D
t
e h
T
R
D
D
D
S
U
C /
S
, U
o n
R
X
s
g i
a n
r t
g i
e g
s r
a
e y
r G
e e
i n
d n
c i
D
S
U
C /
S
U
D
D
- S
. R
M
A
N
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N
i
d n
c i
t a
s e
e s
e l
t c
d e
u
i s
L
B
K
O
N
f i
D
S
O
O
R
i
a f
D
6 S
F
L
A
S
H
N I
G
O
R
f i
T
R
D
D
D
S
D -
P
o l
DS0 DP units. The Total Reach DDS-DP only responds
to latching DS0 DP loopback sequences.
If 64 kbps is selected, the unit will only respond
to latching loopback sequences. Alternating
sequences are not valid at this rate.
4
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D
e
s
c
i r
t p
o i
n
o n
e s
i l a
g n
u c
r r
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p t
e r
e s
o l
p o
c ;
e h
k c
f
r o
o c
i t n
u n
y t i
D
D
S
r e t
m
n i
i t a
n o
t a
e r
m
o
D
S
R -
. )
t s
a h
t t
e h
e r
s i
o n
y s
c n
T
R
D
D
S
D -
P
n a
t d
e h
e r
m
c ;
e h
k c
o f
c r
n o
n i t
i u
, y t
o l
d a
e h
a r
n b
r o
m
l a
i l
e n
t s
a h
t t
e h
e r
a
e r
r e
o r
s r
o
t n
a t
r t s
a e
m
c ;
e h
k c
o f
t r
e h
e n
c
n o
i d
o i t
s n
c
o l
e s
t r
t o
e h
P
N (
E
A
R
E
N
D
. )
t s
a h
t t
e h
e r
a
e r
r e
o r
s r
w
a
d r
t s
e h
e r
m
o
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T
R
D
D
t r
e h
a
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m
l a
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t r
t o
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T
R
D
D
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. )
t s
a h
a t
Q
u
l a
y t i
M
o
t i n
r o
s a
o
c c
r u
e r
. d
a c
e t
t s
e h
a
s b
n e
e c
o
t f
e h
S
U
C /
S
U
s a
e d
r e t
m
n i
d e
y b
- S
. R
i D
c s
n o
e n
t c
d e
n i
a v
d i l
f
a r
i m
g n
a p
e t t
, n r
r o
f l
o r
m
t
e h
D
S
U
C /
S
U
o l l
w
L
E
. D
t a
s e
r p
s e
n e
e c
o
t f
e h
c
s u
o t
s a
e d
r e t
m
n i
d e
b
t y
e h
T
R
a r
e t
h
s a
e b
n e
m
n a
a u
y l l
g n
S
W
. 2
o l
p o
a b
k c
s i
c a
v i t
, e
e s
i s s
n o
s i
c a
v i t
. e
f i
O
C
U
o l
p o
a b
k c
c a
v i t
, e
D
S
R -
h
s a
c a
v i t
t a
d e
T
R
p o
a b
k c
o t
w
a
d r
c
s u
o t
m
. r e
NOTE
Section 61433105L2, Issue 4
Total Reach DDS-DP Bidirectional Loopback
Support
The Series 5 Total Reach DDS-DP will execute a
bidirectional loopback when performing a DS0 loopback,
t n
as shown in Figure 4. This allows a standard portable
DDS test set, connected to the 4-wire customer
e t
interface of the Total Reach DDS-R, to verify the integrity
of the 2-wire loop by transmitting a test pattern and
examining the returning data for synchronization and
o
e t
errors. The Series 5 Total Reach DDS-DP LBK
indicator will illuminate during this test mode.
e h
Intra-office
- S
Figure 4. DS0 Bidirectional Loopback
The Series 5 Total Reach DDS-DP also responds to a
loopback command sent by the Total Reach DDS-R
when the LBK button on the Total Reach DDR-R is
pressed. This allows loop testing to be performed from
the remote end without test center coordination. The
SLC Series 5 Total Reach DDS-DP only performs a
loopback towards the customer in this case. The latching
and alternating loopback sequences are defined in Table
3 and Table 4.
m
r e
Total Reach DDS Trouble Code
The Total Reach DDS system is designed to provide a
quick diagnosis in the case of a circuit condition
where continuity is broken. The trouble code type
received by a tester determines whether the open
condition is occurring on the local loop or at the
customer premises. In the event of an open conductor
or disconnected 2-wire loop, the Total Reach DDS-DP
transmits an alternating ASC/MOS trouble code into
the network as shown in Figure 5. In the event of a
4-wire open or disconnect, the TR DDS-R sends an
ASC to the network as seen in Figure 5.
Remote End Initiated LBK Tests
The Total Reach DDS-DP supports loopbacks
generated from the TROCU-R which allow testing to
be performed without coordination with the CO or test
center. Loopbacks initiated by the TROCU-R front
panel LBK pushbutton aid in system turn-up testing or
troubleshooting from the remote end.
Series 5
TR
DDS-DP
Customer
DS0
Bidirectional
loopback
61433105L2-5D
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