Total Access 1500 Total Reach DDS-DP Installation and Maintenance Guide
12
61180105L1-5C
TR DDS-DP Trouble Code
The
TR
DDS
‐
DP
system
provides
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
a
2
‐
wire
DSL
loss
of
signal,
loss
of
sync,
or
an
open
condition
caused
by
an
open
conductor
or
discon
‐
nected
2
‐
wire
loop,
the
TR
DDS
‐
DP
transmits
an
alternating
MOS
(9Ah)/ASC
(9Eh)
trouble
code
into
the
network
as
shown
in
During
a
similar
Out
‐
of
‐
Service
condition
at
the
customer
premises,
the
Total
Reach
OCU
‐
R
transmits
an
ASC
(9Eh)
upstream
into
the
network
Figure 3. DDS Trouble Codes
TR DDS-DP Bidirectional Loopback Support
The
TR
DDS
‐
DP
will
execute
a
bidirectional
loopback
when
performing
a
DS0
loopback
at
the
TR
DDS
‐
DP
as
shown
in
During
a
bidirectional
loopback
the
DDS
‐
R
enables
test
data
to
pass
through
the
4
‐
wire
interface
to
the
customer
site.
This
allows
a
standard
portable
test
set
at
the
customer
site
to
verify
the
integrity
of
both
the
4
‐
wire
and
2
‐
wire
loops
by
trans
‐
mitting
a
test
pattern
to
the
TR
DDS
‐
DP
and
examining
the
returning
data
for
synchronization
and
errors.
A
bidirectional
loopback
and
pass
‐
through
is
shown
in
.
During
a
bidirectional
loopback
initiated
at
the
TR
DDS
‐
DP
the
DDS
‐
R
CUST LBK
LED
will
flash.
Figure 4. DS0 Loopback at the Total Reach DDS-DP
Channel Bank
Open 2-wire Loop
DSU
OCU-R
DDS-DP
Customer Premises
ASC 9Eh
Channel Bank
ASC 9Eh
Open 4-Wire Customer
Interface
DSU
DDS-DP
Customer Premises
OCU-R
Alternating
MOS (9Ah)/
ASC (9Eh)
Total Reach DDS-DP
Bidirectional
loopback
Customer
Intra-office
