L
OOP
BACK
T
ES
TI
NG
In
itia
te
lo
op
b
ac
k
te
stin
g fr
om
th
e m
ain
te
n
an
ce
m
en
u
s,
the
fro
n
t-pa
n
el
MODE
an
d
SEL
pu
shb
u
tto
n
s,
o
r a
te
st
se
t.
I
n
b
and
cod
es use
d
by
a te
st
se
t ar
e
shown
in
th
e t
abl
e
b
el
ow.
Ta
bl
e 1.
Fr
on
t-
Pane
l Al
a
rm
M
es
sa
g
es
(a)
(a
)
F
ro
n
t-pa
n
e
l al
ar
m
mes
s
age
s a
re l
is
ted
in
or
de
r o
f pr
io
ri
ty
.
ALRM
d
isplays
pr
io
r t
o
a
n
y a
lar
m
m
e
ssa
ge.
P
res
si
ng
the
LB
K
pu
shb
u
tto
n i
n
iti
a
te
s an
A
larm
C
u
toff
(A
C
O
) me
ssag
e
.
Me
ss
a
g
e
D
e
sc
rip
ti
o
n
PW
R
F
EED
SH
R
T
(b
)
(b
)
M
e
ssag
e
di
sp
la
ys r
e
p
eate
d
ly
a
s
l
ong
as th
e a
larm
con
d
iti
o
n exi
s
ts
, an
d i
s
no
t i
n
cl
u
ded
i
n
th
e pr
io
rit
y
or
der
.
A sh
ort
b
et
w
ee
n
th
e Ti
p and
R
ing
o
f t
h
e H
D
SL
2 pa
ir.
PW
R F
EED
GN
D
(b
)
Th
e H
D
SL
2 l
oop
is
g
roun
de
d.
P
W
R F
EED
OP
E
N
(b
)
A l
in
e-
pow
er op
en
c
ond
iti
on.
LO
SW
Th
e
H
D
SL
2
loop
ha
s l
o
st
s
yn
ch
roni
za
tion
.
LL
OS
N
o
si
g
n
al
i
s de
te
ct
ed
at
th
e
D
S
X
-1
in
p
u
t t
o
th
e H
2TU
-C
.
R
L
O
S
N
o
si
g
n
al
i
s de
te
ct
ed
at
th
e
D
S
1 i
n
p
u
t t
o
the
H2
TU
-R
.
LAI
S
(c
)
(c)
D
oe
s no
t ac
ti
vate
the
al
a
rm
re
la
y a
ccess
on
pi
n
H
.
L
ine
A
la
rm
I
n
d
ic
at
ion
S
ign
al
.
RA
IS
(c
)
Re
mo
te
A
lar
m In
d
icat
io
n
S
ig
n
al.
LR
AI
(c
)
An R
A
I a
la
rm
(y
el
lo
w)
fr
om
t
h
e CPE wi
thou
t er
rors
f
ro
m
t
h
e
lin
e
u
n
it or ne
tw
ork
.
RRA
I
(c
)
An R
A
I a
la
rm
(y
el
lo
w)
fr
om
t
h
e CPE wi
th
err
o
rs
fr
om
t
h
e l
in
e
un
it or ne
tw
ork
.
xx
x-LO
F
Th
e
DS
1 i
npu
t d
o
es not
con
tai
n t
h
e ES
F or S
F f
ram
e
p
at
te
rn
s
et
ting of
th
e
FRM
G
o
p
tio
n
.
(xx
x de
not
es
ei
th
er
T
U
C or TU
R
.)
xx
x-D
BER
(c
)
A
s
yst
em
DS
1
B
it E
rro
r Ra
te
(
B
E
R
) al
ar
m.
(xxx
de
not
es
ei
th
er
T
ra
n
sm
is
si
on
U
n
it
Ce
nt
ral
O
ffi
ce
[T
U
C
] o
r T
ra
n
sm
is
sion
U
n
it
R
em
o
te
End
[T
U
R
].
)
PR
M
F
(c
)
H2
T
U
-R
P
erf
o
rm
an
ce
Re
po
rt
Mes
sag
in
g
B
E
R t
h
re
sh
ol
d
exc
ee
de
d
at
f
ar
e
n
d
.
PR
M
N
(c
)
H2
T
U
-R
P
erf
o
rm
an
ce Re
po
rt Mes
sag
in
g
B
E
R
th
re
sh
ol
d exc
ee
de
d at
n
ea
r en
d
.
xx
x-H
BER
A
sy
st
em
H
D
SL2 Bl
oc
k Err
o
r R
at
e (BER
) a
la
rm
. (
xxx
de
not
es
ei
th
er
T
U
C or
T
U
R
.)
xx
x-M
AL
Th
e m
ar
g
in
on t
h
e H
D
S
L2 l
oop
h
as
d
rop
ped
b
elo
w
t
h
e t
h
re
shol
d
s
et
tin
g.
(xx
x de
not
es
ei
th
er
T
U
C or TU
R
.)
xx
x-
L
A
T
he
at
te
nu
at
io
n
o
n
th
e
HDS
L
2
lo
op
h
as e
xc
eed
ed
t
h
e m
axi
mum
th
re
sh
o
ld
v
alu
e.
(xx
x de
not
es
ei
th
er
T
U
C or TU
R
.)
Tab
le 2.
Fr
ont
-P
anel
C
onf
ig
ura
tion O
p
tio
n
s U
si
n
g
M
O
D
E
and
SEL
(a)
(a)
F
ront
-pa
n
e
l con
figur
ati
o
n o
p
ti
o
n
s d
ispl
a
y
i
n
th
e o
rde
r l
is
ted.
D
isp
la
y Code
D
e
sc
ri
pt
io
n (def
au
lt
va
lues
i
n
bo
ld
)
EQ
L
Se
ts
th
e DSX-
1 Equa
liz
er t
o
: 0
(0
to
132
ft
.),
133
(1
33 t
o
265 f
t.)
, 2
66 (26
6
t
o
3
98 f
t.)
,
39
9
(39
9
to
5
3
2
ft.
), or 53
3
(533
to
65
5
ft.
).
RL
B
O
S
ets
t
h
e
H2
T
U
-R
l
in
e b
u
ild
o
u
t
to
0 d
B
, -
7
.5
d
B
, o
r -
1
5
d
B
.
L
PBK
En
ab
le
s
(EN
A
)
o
r di
sa
bl
es
(D
IS
) S
m
ar
tJ
ac
k
lo
o
pba
ck
co
mm
an
d
s.
SPL
B
xxx
x
C
onfi
gures
system for
gen
eri
c (
GNLB
) or
speci
al
in
-ban
d l
o
opbac
k com
m
and
s (A
1LB
, A
2LB
, A
3LB
, A
4LB
,
or
A5
LB
).
PW
R
F
O
FF
= di
sa
bl
es
H
D
SL
2 pow
eri
n
g;
ON
=
HDS
L
2
l
in
e vo
ltag
e i
s -
1
8
0
V
d
c ma
xi
mu
m.
HB
E
R
1E
-6 or 1E
-7 = al
ar
m
a
ct
iv
at
es
w
h
en
th
e H
D
S
L
2 B
E
R
a
lar
m t
h
re
sh
ol
d ex
ce
ed
s 10
-6
or
1
0
-7
.
NON
E
=
p
re
ve
n
ts
g
en
er
ati
o
n
o
f a sys
te
m
alar
m d
u
e to
B
E
R.
DB
E
R
En
ab
le
s (E
NA
) o
r di
sa
bl
es
(DI
S
) f
ix
ed
24-h
our D
S
1 BER
al
ar
m
th
re
sh
ol
d.
AL
M
En
abl
es (
E
NA
) or
di
sab
le
s (
DIS
) al
ar
m
i
n
di
cat
io
ns on
pi
n H.
DS
1
D
SX-1 l
in
e
code
=
AU
T
O
, B8ZS,
or AM
I.
LB
T
O
Lo
opb
ac
k t
im
eout
= NO
N
E
, 2
0
, 60
, o
r 1
20 m
inut
es
or 8 or 24
h
ours
.
FRMG
D
S
1 f
ram
e
fo
rm
at
ting =
AU
TO
(Au
to
f
ra
m
in
g m
o
de
),
SF
(
S
upe
rF
ram
e),
E
S
F
(Ex
te
n
d
ed
S
u
pe
rF
ra
m
e),
o
r UN
FR
(U
nf
ra
m
ed
m
o
de
).
RDA
En
abl
es (
ENA
) or
di
sab
le
s (DI
S
) al
ar
m
i
n
di
cat
io
ns du
e t
o
r
em
o
te
DS
1 L
O
S at
H2
TU
-R
in
put
.
AL
M
P
E
n
ab
les
sy
ste
m
t
o
o
u
tp
u
t an
a
lar
m
pa
tt
er
n
: AI
S
or LO
S.
BPV
T
En
ab
le
s (E
NA
) o
r di
sa
bl
es
(DI
S
) Bi
po
la
r Vi
ol
at
ion Tra
n
sp
ar
en
cy
.
NL
B
P
E
n
ab
les th
e H2
TU
-R
to
tr
an
sm
it ei
th
er
AI
S
o
r LO
S
to
w
ard
s C
I f
o
r an
y ne
tw
ork
l
o
opb
ac
k.
TL
OS
En
abl
es (E
NA
) o
r di
sab
les (
DIS
) a l
ogi
c l
o
o
pbac
k at
th
e H
2
T
U
-R
w
h
en an
L
O
S
occ
u
rs at i
ts DS
1 i
npu
t.
RT
P
V
En
abl
es (
ENA
) or
di
sab
le
s (DI
S
) r
em
o
te
p
rovi
sio
ni
ng
.
PBO
N
C
onfi
g
ures
the p
o
wer
ou
tpu
t l
evel
s o
f the H
2
T
U
-C
n
etwo
rk u
n
it to
ward
the
custo
m
er to
comp
ly
wi
th
Defau
lt (
DEF
) o
r En
hanc
ed (E
NH) t
em
p
la
tes.
PBO
C
C
onfi
g
ures
the p
o
wer
ou
tpu
t l
evel
s o
f the H
2
T
U
-C
c
u
stomer
un
it tow
ard
the n
etwo
rk to
comp
ly
wi
th
Defau
lt (
DEF
) o
r En
hanc
ed (E
NH) t
em
p
la
tes.
Ta
bl
e 3.
Fr
on
t-
Pane
l D
ia
g
no
st
ic
M
ess
ag
es
M
e
ss
age
(a)
(a
)
N
or
m
a
l o
p
e
rat
in
g m
e
s
s
a
ge
s
a
re i
n
bo
ld
.
D
e
sc
rip
ti
o
n
A=
xx
T
h
e
h
ig
h
es
t l
o
op at
te
nu
at
ion (l
os
s of
s
igna
l pow
er)
m
eas
ure
d
i
n
dB.
AC
Q
T
he
m
u
lti
p
le
xe
rs
of
t
h
e H
2
T
U
-C
a
n
d
H
2
T
U
-R
a
re
tr
yi
ng
t
o
es
ta
bl
is
h
sy
nc
hron
iz
at
io
n.
AR
M
T
he
H
2
T
U
-C
i
s a
rm
ed t
o
re
sp
ond
t
o
In
te
llig
en
t R
epe
at
er
L
oop
(I
LR
)
co
de
s.
BA
D R
T
?
T
he
H
2
T
U
-C
is
n
o
t re
ce
iv
in
g a re
spo
n
se
f
rom
th
e H2
TU
-R
.
FE
R
R
A
f
ram
in
g
b
it err
o
r ha
s oc
cu
rre
d at
H
2
T
U
-C
D
S
X
-1
in
p
u
t.
HE
S
H
2
T
U-
C
HDS
L
2
lo
op
c
yc
lic
al
r
edu
n
d
an
cy
ch
ec
k (
C
RC
) er
ro
r.
L
BPV
A l
o
ca
l bi
po
la
r vi
o
la
tio
n has
be
en re
ce
iv
ed
a
t t
h
e D
SX-1 i
npu
t t
o
th
e H
2
T
U
-C
.
M=
xx
Th
e
po
w
er
o
f th
e
re
ce
iv
ed
HDS
L
2 si
gn
al
r
ela
ti
ve
to
n
o
is
e (
S
/N
wi
th
r
es
p
ec
t to
2
1
.5
d
B
).
M
N
G
D
T
h
e H
2
T
U
-C
is
u
nde
r co
nt
ro
l o
f t
h
e H
M
U-3
19 ne
tw
ork
m
ana
ge
m
en
t uni
t.
PW
R
FE
ED
O
FF
H
D
SL2 s
p
an
pow
er
i
s t
u
rn
ed
of
f.
PW
R
F
E
E
D
O
N
H
D
SL2
lo
o
p
i
s not
g
rou
nde
d or s
hort
ed
.
SI
G
T
he
tr
ans
ce
iv
ers
of
t
h
e H2
TU
-C a
nd
H
2
T
U
-R
are
t
ryi
ng
to
es
ta
bl
is
h c
ont
ac
t wi
th
e
ac
h
ot
he
r
o
ve
r t
h
e
H
D
SL
2 l
o
op.
Ta
ble 4
.
F
ro
n
t-
Pa
n
el S
ystem I
n
fo
rm
a
tio
n
Mes
sa
g
es (
S
cr
o
ll M
o
d
e)
(a)
(a
)
T
o
scr
oll th
ro
u
g
h
syste
m
in
for
m
a
tion
m
e
ssag
e
s, p
re
ss th
e M
O
DE
pu
shb
u
tto
n f
o
r 3 o
r m
o
re
sec
ond
s.
Code
D
e
sc
ript
io
n
C
o
d
e
D
es
cr
ip
tio
n
CO
D
E
xx
xx
Li
ne
c
o
d
e (A
M
I, B
8
Z
S
).
LI
S
T
xx
P
ro
d
u
ct
lis
t
n
u
mb
er
.
FR
M
xx
xx
Fr
am
e
p
at
te
rn re
ce
iv
ed
fr
o
m
th
e
DS
X
-1 (
S
F,
ES
F,
o
r U
N
FR
).
MA
RG
xx
M
argi
n
th
re
shol
d (0 t
o
15 dB).
D
ef
aul
t
is
4
.
LATT
xx
L
oop
at
te
nua
tio
n
(0
to
4
0
dB)
. D
ef
aul
t
is
3
5
.
VE
R
x.
xx
Fi
rmw
ar
e ve
rs
io
n
.
Table 5
.
L
o
o
p
ba
ck
Co
m
m
a
nd
s
Loop
bac
k
In
ban
d Code
De
sc
ript
io
n
NL
OC
11
110
00
D
SX-1
s
igna
l i
s l
o
o
p
ed
ba
ck
t
o
th
e
ne
tw
ork
at
t
h
e H
2
T
U
-C
.
NR
EM
11
100
00
D
SX-1
s
igna
l i
s l
o
o
p
ed
ba
ck
t
o
th
e
ne
tw
ork
at
t
h
e H
2
T
U
-R
.
CO
L
B
(a
)
(a
)
D
ua
l loop
ba
cks ca
n b
e
in
itiate
d on
ly fr
om
the
fr
o
n
t-
pa
nel M
O
DE
a
n
d
S
E
L
pu
shb
u
tto
ns.
D
SX-1
s
igna
l is
lo
ope
d ba
ck
t
o
t
h
e n
et
w
o
rk a
t t
h
e H
2TU
-C a
nd si
g
n
al
f
rom
t
h
e
cu
st
om
er
i
s l
o
o
p
ed
ba
ck
t
o
th
e c
u
sto
m
er
at
t
h
e H2
T
U
-C
.
RU
LB
(a
)
D
SX-1
s
ig
n
al i
s l
oop
ed ba
ck
to
t
h
e ne
tw
o
rk
a
t t
h
e H2
TU
-R a
nd si
gn
al
fr
o
m
t
h
e
cu
st
om
er
i
s l
o
o
p
ed
ba
ck
t
o
th
e c
u
sto
m
er
at
t
h
e H2
T
U
-R
.
CR
E
M
11
111
10
DS
1
si
gn
al
fr
o
m
c
u
st
o
m
er
is
lo
op
ed
b
ack
to
t
h
e c
u
st
o
m
er
at
th
e
H2
TU
-C
.
CLO
C
11
111
00
DS
1
si
gn
al
fr
o
m
c
u
st
o
m
er
is
lo
op
ed
b
ack
to
t
h
e c
u
st
o
m
er
at
th
e
H2
TU
-R
.
SM
JK
11
000
DS
X
-1 si
g
n
al i
s l
o
op
ed
b
ac
k to
th
e
n
et
w
o
rk
at
th
e H2
TU
-R
S
m
ar
tJ
ack mo
du
le
.
Loop
dow
n
11
100
Dea
ct
iva
te
s
an
y
o
f th
e ab
ov
e l
o
op
b
ack
s.
Copi
es
of th
is
publi
cati
on o
r the
us
er m
a
nua
l (L
TPH-UM-1
182
-01
)
c
a
n be
downl
oa
de
d from
the
ADC w
e
bs
it
e
a
t ww
w.a
d
c
.c
o
m
. To
or
de
r a h
a
rd
c
opy,
ple
ase
con
tact
your
sale
s
r
e
pr
ese
ntati
ve.
To com
p
ly w
ith the
in
trabu
ildin
g
w
irin
g
r
e
quire
men
ts of G
R
-1
089
C
O
RE,
Se
c
tio
n 4
.5
.9
, the
s
h
ie
lds
of th
e
ABAM-ty
pe
c
a
b
le
s
tha
t
conn
ect
the l
ine
unit
D
S
X-1 ou
tput p
o
rt
s to
the
cr
oss
-con
n
ec
t
pane
l mu
st b
e
grou
nded
at
both e
nds
.
Netw
ork
H2TU-C
H2TU-R
TLOS*
NLOC
CREM
CLOC
NREM
SMJK
*
When enab
led,
TLOS is an automatic loopbac
k
that occurs with an LOS at the remote DS1 input.
T
o
w
ard Customer
T
o
w
ard Netw
or
k
Customer
Premises
DS1
DSX-1
H0025-B
HDSL2
System option b
uttons (f
or man
ual setting of
system parameter
s)
Use MODE and SEL to man
ually modify user options
,
initiate loopbac
ks
, and displa
y DSX-1 line par
ameters
.
Press the MODE pushb
utton f
o
r 1 second and release
.
The front panel alter
nately displa
y
s the first system
par
ameter and its current setting.
Press SEL to step through all possib
le settings f
o
r
the displa
y
ed par
ameter
.
Press MODE to update the par
ameter and adv
ance
to the ne
xt par
ameter
.
After scrolling through all the par
ameters
, press SEL
to confir
m changes when prompted with a CONF NO
message
, or press MODE to cancel all changes
.
1
2
3
4
DSX-1 test access jac
ks
Connect standard test equipment.
Status LED
Repor
ts the f
o
llo
wing conditions:
Four
-c
haracter displa
y
Displa
ys status
, pro
v
isioning, and
alar
m messages
.
See tab
les belo
w
fo
r a list of message descr
iptions
.
Craft por
t
T
o
access all system maintenance
, pro
visioning and
perf
o
rmance screens
, connect a standard 9-pin ter
m
inal
cab
le betw
een the ser
ial por
t on a PC and the H2TU-C
cr
aft por
t.
Car
d handle
Used to inser
t and remo
v
e
card.
LINE
Pro
v
ides splitting jac
k
access to (IN)
and from (OUT) the HDSL2 span at
the DSX-1 interf
ace
.
BRG
Pro
vides non-intr
usiv
e
br
idging jac
k
access to (IN) and from (OUT) the
HDSL2 span at the DSX-1 interf
ace
.
Allo
ws monitor
ing of the DS1 pa
yloads
.
Maintenance
T
erminal Modem settings
:
9600 baud
8 data bits
No par
ity
1 stop bit
Hardw
are flo
w control:
OFF
T
e
rminal em
ulation:
VT100
H0305-A
3
4
5
6
C
D
E
F
H7
8
J
9
K
10
L
1
A
2
B
Car
d-Edg
e Connector
DSX-1
TX-Tip
DSX-1
RCV
-Tip
1
HDSL
2-Tip
System
alar
m
F
rame
GND
F
actor
y
use
only
DSX-1
TX-R
DSX-1
TX-Ring
DSX-1
RCV
-Ring
1
GND
HDSL
2-Ring
Management
b
u
s
-48
Vdc
Fuse
alar
m*
* Fuse alar
m is nor
mally floating
and at -48
Vdc when activ
ated.
S
E
L
M
O
D
E
O
U
T
I
N
B
R
G
L
I
N
E
L
I
N
E
H
2
T
U
*
C
3
1
9
R
S
2
3
2
SETUP
ST
A
T
US
HiGain
HDSL2
B
R
G
DCE
L
List n
umber
A Customer Remote (CREM)
or Netw
o
rk
Local (NLOC)
loopbac
k is in eff
e
ct.
Green LED
Nor
mal oper
ation.
Flashing Red LED
Y
e
llo
w LED
Flashing
Y
e
llo
w LED
System is in Ar
med (ARM)
mode
.
HDSL2 acquisition or
system alar
m.
Off
Line po
w
e
r is off
.
Red LED
Fuse alar
m.
