L
O
O
P
BACK
T
ES
TIN
G
In
itia
te
lo
op
ba
ck
te
stin
g fro
m
th
e m
ain
te
na
n
c
e m
enu
s. The
in
ba
n
d
c
o
d
es
sh
own
b
elow c
an
be se
nt
by a t
est
set
.
Tabl
e 1
.
GN
LB Lo
o
p
b
a
ck
C
o
mma
n
d
s
Lo
opb
ac
k
In
b
and
Co
de
D
e
sc
ri
pt
io
n
NL
OC
1111
000
D
SX-1 si
gn
al
i
s l
oop
ed
b
ac
k t
o
th
e
n
et
w
o
rk a
t t
h
e H
2TU
-C.
NR
EM
1110
000
D
SX-1 si
gn
al
i
s l
oop
ed
b
ac
k t
o
th
e
n
et
w
o
rk a
t t
h
e H
2TU
-R
.
CR
EM
1111
110
DS
1
s
ig
n
al f
rom
cu
st
o
m
er
i
s l
o
o
p
ed
b
ack
t
o
th
e
cu
st
ome
r at
t
h
e H2
T
U
-C
.
CLO
C
1111
100
DS
1
s
ig
n
al f
rom
cu
st
o
m
er
i
s l
o
o
p
ed
b
ack
t
o
th
e
cu
st
ome
r at
t
h
e H2
T
U
-R
.
SM
JK
1100
0
D
SX-1 s
igna
l i
s l
o
ope
d
bac
k t
o
t
h
e
net
w
o
rk
at
t
h
e H
2TU
-R
Sm
ar
tJ
ac
k m
odu
le
.
Lo
opd
own
1110
0
D
ea
ct
iva
te
s a
n
y
o
f th
e ab
ov
e l
oop
ba
ck
s.
Ta
b
le
2.
LED
S
tat
us
an
d Fu
nct
ions
LE
D an
d St
at
us
F
unc
tion
DS
L
OF
F
N
o
po
we
r i
s ap
pl
ie
d t
o
t
h
e
H2
TU
-C.
So
lid
g
re
en
N
o
rm
al ope
rat
ion:
HD
SL
2 spa
n
i
s s
yn
chr
oni
ze
d wi
th
out
e
rro
r.
So
lid
re
d
H
B
ER
, M
A
R
G
, or
PW
R
F al
ar
m
is
pre
se
n
t a
t t
h
e
H
2TU
-C
.
Flas
hi
ng
r
ed
on
ce
e
ver
y se
co
n
d
H
D
SL2
lo
o
p
i
s at
te
m
p
tin
g
sy
nc
hron
iz
at
io
n.
ALM
OF
F
No
rm
al
op
er
at
io
n
: th
e DS
X
-1 si
gn
al
is
p
rese
n
t at b
o
th
th
e H2
T
U
-R
an
d
H2
TU
-C
.
So
lid
y
ello
w
R
L
O
S
i
s pre
se
nt
at
th
e
H2
TU
-R
.
So
lid
re
d
LL
OS
i
s pr
es
en
t at
th
e H2
T
U
-C
.
D
SX/
D
S
1
So
lid
g
re
en
N
o
rm
al ope
rat
ion:
th
e D
S
X
-1 si
g
n
al
i
s er
ror f
ree
.
So
lid
re
d
L
L
O
S
, BPV, f
ra
m
e e
rror, or CR
C
is
p
re
se
n
t a
t t
h
e H
2TU
-C.
ESF
/SF
OF
F
Un
fr
ame
d
D
S
X
-1
is
pr
esen
t a
t t
h
e H2
TU
-C
, un
it se
t as
un
fr
am
ed
, o
r no
DS
X
-1 i
s de
te
ct
ed
at
th
e H2
T
U
-C
.
So
lid
y
ello
w
E
S
F f
ram
e
fo
rm
at
ting i
s pr
es
en
t at
the
H2
TU
-C
.
Fl
as
h
in
g
ye
llo
w on
ce
e
ver
y
se
co
n
d
ES
F fr
am
e
fo
rm
at
ti
n
g
a
n
d
f
rame
er
ro
r/
C
R
C
a
re p
res
en
t
at
th
e H2
T
U
-C
.
So
lid
g
re
en
S
F f
rame
fo
rm
at
ti
ng
i
s p
res
en
t
at
th
e
H2
TU
-C
.
Flas
hi
ng
g
ree
n
on
ce
e
ver
y se
co
n
d
S
F fra
m
e f
o
rm
at
tin
g
an
d fra
m
e e
rror a
re pr
es
en
t at
the
H2
TU
-C
.
B8Z
S
/A
M
I
OF
F
N
o
D
S
X
-1 s
ig
n
al i
s pr
es
en
t at
th
e
H2
TU
-C
.
So
lid
y
ello
w
B8
ZS i
s pre
se
nt
at
th
e
H
2
T
U
-C
.
Fl
as
h
in
g
ye
llo
w on
ce
e
ver
y
se
co
n
d
B
8
Z
S
a
n
d
e
xc
ess
z
ero
s st
rin
g
ar
e
pr
es
en
t
at
th
e H2
T
U
-C
.
So
lid
g
re
en
A
MI is
p
res
en
t at
th
e H2
T
U
-C
.
Flas
hi
ng
g
ree
n
on
ce
e
ver
y se
co
n
d
AM
I a
n
d
BPV
ar
e pr
es
en
t a
t t
h
e H
2
TU
-C.
LBK
OF
F
H
2
T
U
-C
i
s n
o
t i
n
loop
ba
ck
.
So
lid
y
ello
w
H2
TU
-C
i
s i
n
ei
th
er
NL
OC
or
C
R
EM
(R
L
B
).
To com
p
ly
w
ith the
in
trabu
ildin
g w
iri
ng requi
re
me
nts of G
R
-108
9
CO
RE,
Se
c
tion 4
.5
.9
, the
s
h
ie
lds
of t
h
e
ABAM-ty
pe
c
a
ble
s
tha
t
conn
ect the line unit
D
SX-1
o
u
tput
ports t
o
the
cros
s-co
nnec
t
pane
l m
u
st b
e
gro
unde
d at
both
ends
.
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.
Do
wnstream
Upstream
Customer
Premises
DS1
DSX-1
H0025-A
Ta
b
le
3.
M
a
in
ten
a
n
ce Ter
m
in
a
l C
o
n
fig
Men
u
—S
ta
n
d
a
rd
Op
tio
n
s
(a)
(a
)
D
e
fa
u
lt
s
e
tti
ng
s
ar
e i
n
bo
ld
.
St
and
ard
O
p
tio
n
F
unc
tion
L
oopb
ac
k T
im
eout
(L
BTO
)
Se
ts
au
to
m
at
ic
c
an
ce
lla
tion of
a
ll l
o
o
pba
ck
s
to
NO
N
E
, 2
0
m
in
, 60
m
in,
or
12
0
mi
n
aft
er
a
ct
iva
ti
o
n
.
L
oop At
te
nua
tio
n
T
h
re
sh
ol
d (LATT
)
D
ete
rm
in
es
th
e m
ax
imu
m
lo
o
p
at
te
n
u
at
io
n
(
0
to
4
0
d
B
) b
efo
re
a
n
al
ar
m i
s
d
ec
lare
d
. Zer
o
di
sa
bl
es
th
e al
ar
m
. D
ef
aul
t se
tti
n
g
is
32
d
B
.
M
argin Th
res
h
o
ld
(M
AR
G
)
Det
er
m
in
es
th
e min
imu
m
allo
wa
b
le mar
g
in
(0
to
1
5
d
B
) b
elo
w wh
ich
a sys
te
m
alarm
ca
n oc
cu
r.
Z
ero
d
isa
bl
es
the
al
ar
m
. D
ef
au
lt se
tt
ing i
s
4 dB.
DS
1
Fr
am
e
Fo
rm
at
ti
n
g
(F
R
M
G
)
AU
TO
=
s
ys
tem
se
ar
ch
es
D
S
1
tr
an
sm
is
sion
f
o
r
S
F o
r E
S
F
fr
am
e p
at
te
rn.
S
F =
s
et
s
sys
te
m f
o
r S
F f
ra
m
e
fo
rm
at
ti
n
g
.
ES
F =
s
ets
s
yst
em
fo
r E
S
F
fr
ame
f
o
rm
at
tin
g
.
U
N
FR
= sy
st
em
fu
nc
ti
on
s as
a t
ran
spa
re
n
t b
it pi
pe
.
D
S
1 Li
ne
Codi
ng
(
D
S1
)
B8
ZS
=
se
ts
sy
st
em
fo
r B
8ZS
l
in
e c
ode
.
A
MI =
se
ts sy
ste
m
fo
r A
MI lin
e
co
d
e.
H
2
T
U
-C
Equ
al
iz
at
ion
(E
Q
L
)
Se
ts
t
h
e D
SX-1 e
q
u
alize
r t
o
: 0
(0
to
132
f
t.)
, 133
(13
3
t
o
26
5 f
t.)
, 26
6 (2
66
to
3
98 f
t.)
, 39
9
(39
9
to
53
2 f
t.)
, or 53
3
(533
to
655
ft
.).
H
2
T
U
-R
Li
ne
Bui
ld
out
(R
LBO
)
S
et
s t
h
e D
S
1
re
ce
iv
e l
evel
o
u
tp
u
t to
w
ar
d
th
e C
u
sto
m
er
In
te
rfa
ce
to
0
d
B
,
-7
.5 dB
, o
r -
1
5.
0
dB
.
Ala
rm
Pa
tte
rn
(ALM
P)
En
ab
le
s an
AI
S
o
r L
O
S ou
tp
ut
a
t t
h
e D
S
1 por
ts
fo
r LO
SW
o
r L
O
S D
S
1.
H
2
T
U
-R
TLO
S Lo
opba
ck
(T
LO
S)
E
n
ab
le
s
(E
N
A
) or di
sa
bl
es
(
DI
S
) a
T
L
O
S
l
o
o
pba
ck
at
H
2
T
U
-R
fo
r
LO
S
a
t i
ts
D
S
1 i
npu
t (i
f e
n
ab
le
d
a
t t
h
e H
2TU
-R
).
N
et
w
o
rk
L
oop
bac
k
Pa
tte
rn (N
LBP)
En
ab
le
s
th
e
H2T
U
-R
to
t
ran
smi
t a
n
AI
S
o
r LO
S
to
w
ard
s C
I f
o
r an
y ne
tw
ork
lo
o
pba
ck
.
P
o
w
er
B
ack
Of
f Net
w
o
rk
(PB
O
N
)
T
h
e po
we
r out
put
l
ev
els
o
f t
h
e H2
TU
-C ne
tw
ork
u
n
it t
o
wa
rd t
h
e c
u
st
om
er
.
D
efa
u
lt (
DE
F
) or
en
ha
nc
ed
(E
NH)
.
Po
we
r
Ba
ck
O
ff Cus
to
m
er
(PB
O
C)
T
h
e po
we
r out
put
l
ev
els
o
f t
h
e H2
TU
-R
c
u
st
o
m
er un
it t
o
w
ar
d
t
h
e ne
tw
ork
.
D
efa
u
lt (
DE
F
) or
en
ha
nc
ed
(E
NH)
.
Tab
le 4.
Ma
in
ten
a
n
ce Termi
n
a
l Co
n
fig
M
en
u
—ADC
Op
tio
n
s
(a)
(a
)
D
e
fa
u
lt
s
e
tti
ng
s
ar
e i
n
bo
ld
.
AD
C O
p
tion
F
unc
tion
Li
ne
P
o
we
r Fe
ed
(
P
WR
F)
En
ab
le
s (
ON
) or di
sa
b
le
s
(O
FF
) H
D
S
L2 l
in
e po
we
r.
R
em
o
te
Pr
ov
is
ioni
ng
(R
TPV
)
En
ab
le
s (
EN
A
) or di
sa
bl
es
(D
IS
) re
m
o
te
pro
vis
io
ni
ng
.
Bi
po
la
r Vi
ol
at
ion
T
ra
n
sp
ar
en
cy
(BPVT
)
E
n
ab
le
s
(E
N
A
) or di
sa
bl
es
(
DI
S
) Bi
po
la
r Vi
ol
at
ion Tr
ans
p
ar
en
cy
.
DS
1
B
E
R (
D
B
E
R)
E
n
ab
le
s
(E
N
A
) or di
sa
bl
es
(
DI
S
) 2
4
-ho
u
r D
SX-1 BER
ala
rm
th
re
sh
old.
H
D
SL2 BER
Thr
es
hol
d
(H
BER
)
Se
ts
H
D
SL2
BE
R
a
la
rm
t
h
re
sh
o
ld
a
t 1E
-6
, 1
E
-7
or
N
ONE
.
Sp
ec
ia
l Loo
pba
ck
M
o
de
(SP
L
B)
Co
nf
ig
ure
s sys
te
m
f
o
r g
en
eri
c
(GN
LB
) or
s
p
ec
ia
l in
b
an
d
l
o
opb
ac
k c
o
m
m
and
(A3
L
B).
S
m
ar
tJac
k Lo
o
p
b
ac
k
(L
PBK)
En
ab
le
s (
EN
A
) or di
sa
bl
es
(D
IS
) Sm
ar
tJ
ac
k
(S
M
JK) l
oop
ba
ck
c
o
m
m
ands
.
N
et
w
o
rk
AI
S
Pa
tte
rn
(N
AI
S)
If
A
L
MP
is
se
t
to
A
IS
, d
et
er
m
in
es
w
h
ic
h
p
att
er
n
is
se
n
t t
o
th
e
n
etw
o
rk
w
h
en
a
re
m
o
te
LO
S or AI
S oc
cu
rs
. CI
= AI
S
-CI
s
ent
t
o
t
h
e ne
tw
ork
; AI
S
=
AI
S s
ent
to
th
e n
etw
o
rk
.
Pe
rf
orm
ance
Re
po
rt
M
ess
ag
ing (P
R
M
)
O
FF = no e
nha
nc
ed
Pe
rf
orm
anc
e Re
po
rt
M
es
sa
g
in
g
, SPR
M
= Supp
le
m
en
ta
l
P
R
M,
NP
RM
=
Ne
tw
o
rk
P
R
M,
S + N
= H
2TU
-R
ge
ner
at
es
bot
h SPR
M
s an
d
N
P
R
M
s wh
ene
ve
r po
ss
ib
le
.
RA
I to
R
A
I-
C
I to
wa
rd
s
N
E
T
(R
ACI
)
En
ab
le
s (
EN
A
)
or d
isa
bl
es
(D
IS
) c
onv
er
si
on
of
a
D
S
1 R
A
I si
gn
al
(y
ell
o
w a
larm
)
rece
ive
d
b
y t
h
e H
2
T
U
-R
to
a
n
RA
I-
C
I sig
n
al
to
w
ar
d
th
e
n
etw
o
rk
.
E
S
F-
RA
I to
S
F-
R
A
I
Ove
rwr
it
e (
R
OV
R)
E
n
abl
es (
ENA
) or
di
sab
les (DIS
) c
onver
si
on
of an
ES
F D
S
1
p
ay
lo
ad
f
rom
th
e
n
et
w
or
k wi
th
an
e
m
bed
d
ed
RAI
pa
ttern
to
an
SF
-R
AI
pa
tte
rn t
o
wa
rd t
h
e CI
a
t
th
e
H
2
T
U
-R
. CON
V
opt
ion m
u
st
be
se
t t
o
F
C
O
N
or
ACO
N
.
H
2
T
U
-R
D
S
1 Fra
m
e
Co
nve
rs
ion (CO
N
V
)
OF
F
= f
ram
in
g
de
te
rm
in
ed
by
t
h
e D
S
1 F
R
M
G
o
p
tion
, A
C
ON
= a
u
tode
te
ct
io
n
of
fr
am
in
g an
d pot
en
ti
al f
ram
e co
nve
rs
ion a
t t
h
e H
2
T
U
-R
, FC
O
N
=
aut
o
d
et
ec
tio
n
o
f f
ra
m
ing a
nd f
o
rce
d
f
ram
e
fo
rm
at
c
onv
er
si
on
a
t t
h
e H
2TU
-R
.
Fr
ac
tio
n
al
T1
M
o
de
(F
T1
)
E
n
ab
le
s
(E
N
A
) or di
sa
bl
es
(
DI
S
) s
ys
tem
res
p
o
n
se
to
D
D
S l
at
chi
ng
l
o
o
pba
ck
co
m
m
an
d
s
fo
r f
rac
tio
n
al
T1 a
ppl
ic
at
io
ns
, CP di
sc
on
ne
ct
, a
nd t
roubl
e
in
d
ic
at
io
n
.
Copi
es
of th
is
publi
cati
on o
r the
us
er m
a
nua
l (L
TPH-UM-1
169
-xx)
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.
Fr
ont P
anel
Car
d-Edg
e Connector
106
105
104
103
102
101
100
DSX-1
OUT
DSX-1
IN
205
204
203
202
201
200
119
118
117
116
115
114
113
112
111
110
GND
GND
F
rame
GND
Fuse
alar
m*
Ring1
Tip1
Management
b
u
s
Ring
Tip
F
actor
y
b
ur
n-in
-48
Vdc
219
218
217
216
215
214
213
212
211
210
209
208
207
206
109
108
107
* Fuse alar
m is nor
mally floating (0 to 80
Vdc max.) and
at -48
Vdc (10 mA max.) when activ
ated.
HDSL2
Span
Ring
Tip
Craft por
t
List n
umber
CLEI/ECI bar code label
(inside handle)
Handle
Maintenance
T
e
rminal Modem Settings
9600 baud
8 data bits
No par
ity
1 stop bit
Hardw
are flo
w control:
OFF
T
e
rm
inal em
ulation:
VT100
DSX-1 access jac
ks
Connect standard test equipment.
LINE
Pro
v
ides splitting jac
k
access to
(IN) and from (OUT) the HDSL2 span
at the DSX-1 interf
ace
.
MON
Pro
v
ides non-intr
usiv
e
monitor
ing jac
k
access to (IN) and from (OUT) the
HDSL2 span at the DSX-1 interf
ace
.
Allo
ws monitor
ing of the
T1 pa
yloads
.
T
o
access all system maintenance
, pro
v
isioning
and perf
o
rmance screens
, connect a standard
DB-9 ter
m
inal cab
le betw
een the ser
ial por
t
on a PC and the H2TU-C cr
aft por
t.
Status LEDs
H0061-A
H2TU-C 388
DSL
LINE
I
N
I
N
O
U
T
O
U
T
ALM
DSX
DS1
ESF
SF
YEL
GRN
B8ZS
AMI
LBK
MON
DSX1
RS 232 DCE
L