L
O
O
P
BACK
T
ES
TIN
G
In
itia
te
lo
o
p
b
a
ck
te
stin
g
from
th
e HiGa
in
m
ain
te
na
n
c
e m
en
u
s o
r u
se
the
M
ODE a
n
d
S
EL
bu
tt
o
n
s.
T
h
e he
xi
de
ci
mal
i
n
b
and
c
o
d
es sho
w
n be
lo
w can
b
e sen
t b
y
a t
est
set
.
GN
LB
Lo
o
p
b
a
ck C
o
m
m
an
d
s
L
oop
bac
k
In
b
and
Co
de
D
e
sc
ri
pt
io
n
NL
OC
111
100
0
DS
X
-1
si
gn
al
i
s l
o
op
ed
ba
ck
to
t
h
e n
et
w
o
rk
at
th
e
HL
U.
NDU1
110
000
DS
X
-1
si
gn
al
i
s l
o
op
ed
ba
ck
to
t
h
e n
et
w
o
rk
at
th
e
HDU
1.
NDU2
111
000
DS
X
-1
si
gn
al
i
s l
o
op
ed
ba
ck
to
t
h
e n
et
w
o
rk
at
th
e
HDU
2.
NDU3
101
000
1
DS
X
-1
si
gn
al
i
s l
o
op
ed
ba
ck
to
t
h
e n
et
w
o
rk
at
th
e
HDU
3.
NDU4
101
001
0
DS
X
-1
si
gn
al
i
s l
o
op
ed
ba
ck
to
t
h
e n
et
w
o
rk
at
th
e
HDU
4.
NRE
M
111
000
0
DS
X
-1
si
gn
al
i
s l
o
op
ed
ba
ck
to
t
h
e n
et
w
o
rk
at
th
e
HRU
.
SM
JK
110
00
D
S
X
-1
si
gn
al
is
lo
o
p
ed
b
ac
k to
th
e
ne
tw
ork
a
t the
H
R
U
S
m
ar
tJ
ac
k
mo
d
u
le
.
CL
O
C
111
110
0
Si
gn
al
f
ro
m
c
u
st
om
er
i
s l
oope
d ba
ck
t
o
th
e
cu
st
o
m
er a
t t
h
e H
L
U
.
CD
U
1
111
100
S
ign
al
fro
m
c
u
st
o
m
er i
s l
o
ope
d ba
ck
to
th
e cu
st
om
er
at
th
e HD
U
1
.
CD
U
2
111
110
S
ign
al
fro
m
c
u
st
o
m
er i
s l
o
ope
d ba
ck
to
th
e cu
st
om
er
at
th
e HD
U
2
.
CD
U
3
101
100
1
S
ign
al
fro
m
c
u
st
o
m
er i
s l
o
ope
d ba
ck
to
th
e cu
st
om
er
at
th
e HD
U
3
.
CD
U
4
101
101
0
S
ign
al
fro
m
c
u
st
o
m
er i
s l
o
ope
d ba
ck
to
th
e cu
st
om
er
at
th
e HD
U
4
.
CR
E
M
111
111
0
Si
gn
al
f
ro
m
c
u
st
om
er
i
s l
oope
d ba
ck
t
o
th
e
cu
st
o
m
er a
t t
h
e H
R
U
.
L
oop
dow
n
111
00
De
act
iv
ate
s
an
y o
f th
e ab
o
ve
l
o
op
b
ac
ks.
For m
o
re de
tail
ed i
n
forma
tion
abou
t the
Ma
inte
nanc
e Te
rmin
al
scre
e
ns
, prov
isio
ning,
and
loop
bac
k
m
ode
testi
ng, re
fer to
the
H
L
U
-38
8 Lis
t 5A
tech
nica
l pr
ac
tice
, do
cum
e
nt n
u
mb
er
150
-38
8
-15
1
-xx
. I
t c
a
n
be
dow
nlo
a
de
d from
th
e Cu
stom
er Si
te
portion
of the
Pai
rG
a
in
We
b pa
ge
at
www
.p
a
ir
g
ai
n
.co
m
.
A pas
s
w
o
rd i
s
requi
re
d to
ac
ces
s th
e Cus
tom
er Site
We
b pa
ges
. If
you
do
not
have
a pa
ss
wor
d
, co
ntac
t you
r
Pair
G
a
in
sal
es
re
pr
es
enta
tive
.
Fr
on
t-
Pan
el
Alar
m M
es
sa
g
es
(a)
(a
)
A
lar
m
(A
LR
M
) displays p
rior
to
an alar
m
m
essage.
P
ressing
th
e S
EL
but
ton
init
iat
es an
A
lar
m
C
u
to
ff (
A
C
O
)
m
essage.
Me
ss
a
g
e
D
e
sc
rip
ti
o
n
LO
SW
In
di
ca
te
s
th
at
on
e of
th
e
H
D
S
L l
oop
s ha
s l
o
st
s
ync
.
LLO
S
In
d
ic
at
es
th
at
no
s
igna
l is
d
et
ec
ted a
t t
h
e D
SX-1 i
npu
t t
o
th
e
H
L
U
.
RL
OS
In
d
ic
ate
s
th
at
n
o
si
g
n
al
is
de
te
cte
d
at
t
h
e DS
-1
i
n
p
u
t t
o
th
e
HRU
.
B
E
R
A
s
ys
tem
B
it E
rr
o
r Ra
te
al
ar
m i
s i
n
eff
ec
t.
M
A
L1
or
M
A
L2
Th
e m
argi
n
on
HD
SL
Loo
p 1
or
Loo
p 2
ha
s d
rop
ped
be
lo
w
t
h
e t
h
re
shol
d
se
t by
t
h
e
use
r.
NO
NE
No
a
lar
m
pr
esen
t.
S
ystem C
o
n
fig
u
ra
tio
n
C
o
d
es
C
ode
De
sc
ri
pt
io
n
VE
R
xx
xx
The
re
le
as
e r
ev
isi
on
of
t
h
e
firm
w
are
(a
pp
ea
rs
du
ri
ng
th
e Sy
st
em
Set
tin
gs
re
vi
ew
m
o
d
e)
.
LI
S
T
xx
xx
The
m
o
de
l nu
m
b
er
o
f t
h
e pro
duc
t (a
ppe
ar
s du
ri
ng t
h
e Sy
st
em
Set
tin
g
s
re
vie
w
m
ode
).
FRM
xx
xx
Ind
ica
te
s t
h
e t
yp
e of
fr
am
e pa
tt
ern
b
ein
g
r
ec
eiv
ed
fr
om
th
e D
S
X
-1,
whe
re
xx
xx
is
SF
,
E
S
F,
UN
FR,
o
r NO
NE)
.
CO
D
E
x
xxx
The
lin
e co
de s
et
tin
g
, wh
er
e
xxxx
i
s A
lte
rn
at
e M
ar
k I
n
ver
sio
n
(A
M
I)
o
r B
ip
o
lar
w
ith
8-Ze
ro
Su
bst
itu
tion
(B8
Z
S).
P
LEV
xxxx
Ind
ica
te
s t
h
e H
D
S
L l
in
e vo
lta
g
e i
n
i
ts
L
O
W
(-14
0
V
d
c)
, H
IG
H
(
±11
2
V
dc)
, or D
IS
(d
is
ab
le
d
).
Fr
on
t-
P
a
ne
l D
ia
g
no
st
ic
Me
ss
ag
es
M
e
ss
a
g
e
D
es
cri
p
tio
n
(nor
m
a
l op
erat
in
g m
e
ss
ag
es
in
bol
d)
1=
xx
or
2
=
yy
In
d
ica
te
s t
h
e p
o
w
er
of
t
h
e r
ec
eiv
ed
HD
S
L
si
g
n
al
on
e
ac
h
lo
o
p
r
ela
ti
ve
to
n
o
ise
. A
n
y
val
ue
of
06 (dB
) o
r g
re
at
er i
s a
d
equa
te
f
o
r re
lia
bl
e sy
st
em
op
era
tio
n.
A
C
Q
1
o
r A
C
Q
2
T
he
mu
lti
p
le
xe
rs
of
th
e
HL
U an
d th
e HRU or
th
e fi
rs
t d
o
u
b
le
r ar
e tr
yi
ng
to
es
ta
bl
is
h
sy
n
chr
oni
za
tion
ov
er
Loop
1
o
r Loo
p 2
o
f Spa
n
1.
A
n
L
1
or A
n
L
2
T
h
e mu
lti
p
lexe
rs
o
f th
e t
w
o d
evi
ces
on
S
p
an
n
ar
e t
ryi
ng
to
e
st
ab
lis
h sy
nc
hro
n
iz
at
ion w
ith
ea
ch
ot
he
r
o
n
Loo
p 1 or Loo
p 2,
w
h
er
e
n
i
s t
h
e nu
m
b
er
o
f th
e s
p
an
.
B
A
D
RT
?
T
he
HL
U i
s no
t r
ece
iv
in
g
a
n
y
re
sp
on
se
fr
o
m
th
e HRU.
D
S
O
N
ON
E
=
no
D
S
O
cha
n
n
els
b
lo
ck
ed
. BLK
=
s
o
m
e
ch
anne
ls
bl
oc
ke
d.
FE
R
R
Fr
am
in
g
b
it err
o
r oc
cu
rre
d
at
H
L
U
DSX-
1 i
n
put
.
H
1ES or H
2ES
H
D
S
L
Loop
1
o
r Loo
p
2
C
R
C e
rror.
n
HDU
Indi
ca
te
s t
h
e num
be
r (
n
)
of
d
o
u
b
le
rs
i
n
t
h
e c
irc
u
it (
if
an
y
ar
e
pr
esen
t)
.
IN
S
L
xx
dB
T
h
e ma
xi
m
u
m
In
se
rti
o
n
L
o
ss
mes
sa
g
e (
INS
L)
ap
pe
ar
s fo
llow
ed
b
y xx
dB
, w
h
er
e
xx
is
th
e
m
ax
im
u
m
i
n
se
rt
io
n i
n
d
B
o
f al
l sp
an
s an
d l
o
ops
.
LBPV
A
lo
ca
l b
ipol
ar
v
iol
at
ion
ha
s b
ee
n
re
ce
iv
ed
at
t
h
e D
S
X-1
i
n
put
t
o
th
e
H
L
U
-38
8 L
ist
5
A
.
M
N
G
D
Th
e H
L
U
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 un
it.
P
W
R
FE
E
D
GND
On
e of
th
e
HD
S
L
l
o
op
s ha
s be
en
g
rou
n
d
ed
.
PWR
FE
ED
O
N
Indi
ca
te
s t
h
at
t
h
e
H
D
SL l
o
ops
are
not
g
rou
nde
d or s
hort
ed
.
P
W
R
FE
ED
O
FF
H
D
S
L
spa
n
po
we
r
h
as
be
en t
u
rne
d
of
f.
P
W
R
FE
E
D
S
HRT
In
d
ica
te
s a sh
o
rt be
tw
ee
n th
e t
w
o
HDS
L
p
air
s or
th
e i
n
ab
ility
o
f t
h
e H
RU to
co
mmu
ni
cat
e
wi
th
t
h
e HL
U.
S
E
LF
T
E
S
T
T
he
HL
U
is
in
a
sel
f-
te
st
mo
d
e.
Th
is
o
cc
u
rs
ev
er
y
po
w
er
o
n
/o
ff
cy
cl
e.
SI
G
1
or
SI
G
2
Th
e t
ran
sc
ei
ve
rs
of
th
e HL
U a
nd H
R
U
or f
irs
t d
oub
le
r a
re t
ryi
n
g
t
o
e
st
ab
lis
h c
ont
ac
t w
ith
ea
ch
ot
he
r
o
n
Loo
p
1
or Loo
p 2 of
Spa
n
1.
S
n
L
1
or S
n
L2
Th
e
tr
an
sc
ei
ve
rs
of
t
h
e t
w
o
d
ev
ice
s
on
S
p
an
n
a
re t
ryi
n
g
to e
st
ab
lis
h co
nta
ct
wi
th
ea
ch
ot
he
r on Lo
op 1 or
Lo
op 2,
whe
re
n
i
s th
e nu
mb
er
o
f th
e sp
an
.
TL
OS
H
R
U
i
s i
n
a l
ogi
c
lo
o
pba
ck
st
at
e
ca
u
se
d
by
a
l
o
ss
of
it
s T1 i
npu
t f
rom
th
e CI
.
S
ystem S
ettin
g
s
Di
sp
la
y C
o
d
e
D
e
sc
rip
ti
o
n
(
d
e
fa
u
lt
va
lu
e
s in
b
o
ld
)
EQ
L
Se
ts
t
h
e
E
qua
liz
er
(EQ
L
) D
SX-1 t
o
:
0 (
0
t
o
133
ft.)
, 1
33
(13
3
t
o
266
f
t.)
, 26
6 (
266
t
o
3
99
ft.
), 399
(3
99 t
o
533 f
t.)
, 5
3
3
(53
3
to
6
55 f
t.)
.
L
PBK
En
ab
le
s (
EN
A
) o
r d
isa
b
les
(
D
IS
) al
l in
ba
nd
S
M
JK
l
o
o
p
b
ack
co
mma
nd
s.
SPL
B
C
o
n
fig
u
res
th
e sy
st
em f
o
r
ge
n
er
ic
in
ba
nd
l
o
o
p
b
ac
k co
mma
n
d
s (
GNL
B
) o
r sp
ec
ia
l
lo
opba
ck
co
m
m
an
d
s
(A1L
B,
A2
LB,
A3
LB,
A4
LB,
A5
LB).
PW
R
F
D
IS =
d
is
ab
le
s
HD
SL
po
we
ri
ng.
LO
W =
H
D
S
L
l
in
e
vo
ltag
e a
t -
1
4
0
V
d
c ma
xi
m
u
m.
AU
TO
=
au
to
m
at
ic
all
y s
w
itch
es
b
et
w
ee
n
-
140
Vd
c
fo
r n
on-
dou
bl
er
appl
ic
at
io
ns
a
n
d
±112
Vd
c f
o
r dou
bl
er a
ppl
ic
at
io
ns
.
H
IGH
=
±11
2 Vdc
fo
r a
ll ap
pl
ic
at
io
n
s.
ZB
T
S
O
N
=
E
S
F f
ram
e
is
o
p
er
at
ing i
n
i
ts
Z
er
o
-By
te
T
im
e Sl
o
t I
n
te
rc
ha
nge
(
Z
BTSI
) m
ode
.
OF
F
=
E
S
F
fr
am
e i
s o
p
er
at
ing
in
it
s n
o
rm
al
no
n-ZB
TSI
m
o
d
e.
BE
R
T
NONE
=
p
rev
en
ts
g
en
er
ati
o
n
o
f a
s
yst
em
al
ar
m d
u
e t
o
ex
ce
ssi
ve
B
E
R
.
1E
-6
or
1E
-7
=
al
ar
m
a
ct
iva
te
s w
h
en
B
E
R t
h
re
sh
ol
d
exc
ee
ds
1
0
-6
or
10
- 7
, r
esp
ec
ti
vel
y.
LB
T
O
L
oop
ba
ck
ti
m
eou
t = N
O
N
E
, 20,
60
, 120
m
inut
es
.
DS
1
L
ine c
ode
=
, AU
TO
, B8Z
S
, or
A
MI.
FR
MG
Fr
ami
n
g
=
AU
T
O
or
U
N
FR
(unf
ra
m
ed
).
HA
IS
T
ra
n
sm
its t
h
e AI
S s
ign
al
a
t t
h
e HL
U
and
H
R
U
ou
tp
ut
port
s i
f on
e (1
LP) o
r bo
th
(
2LP
) H
D
SL
lo
o
p
s ar
e no
t i
n
sy
n
c.
SAI
S
En
ab
le
s (
EN
A
) or di
sa
bl
es
(D
IS
)
N
R
EM
/S
M
JK l
o
opb
ac
k m
o
d
e.
DS
O
D
S
O
b
lock
ing on
(B
LK) or of
f (
NO
NE
); ca
n onl
y b
e se
t t
h
rou
gh t
h
e M
ain
te
na
nce
Te
rm
in
al
.
MA
RG
0
t
o
15
dB
; de
fa
ul
t i
s 4d
B
; c
an
o
n
ly
be
se
t t
h
rou
gh t
h
e M
ain
te
na
nce
Te
rm
in
al
.
RDA
En
ab
le
s (
EN
A
) or di
sa
bl
es
(D
IS
)
re
m
o
te
D
S
1 LO
S at
H
R
U i
n
p
u
t.
AL
M
P
En
ab
le
s l
in
e
to
ou
tp
u
t an
(AI
S
) p
ay
loa
d
or
an
(L
OS
) c
o
n
d
iti
o
n
.
RT
P
V
En
ab
le
s (
EN
A
) or di
sa
bl
es
(D
IS
)
re
m
o
te
pr
ovi
sioni
ng
.
BPVT
En
ab
le
s (
E
NA
) o
r d
isa
b
les
(
DI
S
) b
ip
o
la
r v
iola
tion
tr
an
sp
ar
en
cy
(BVP)
.
C
ONF
YE
S
=
c
o
n
fir
m
s
th
at
al
l ope
ra
ting
m
o
d
es
are
t
o
be
upd
at
ed
to
t
h
ei
r cu
rre
nt
s
ele
ct
ions
.
NO
=
p
re
ve
n
ts
t
h
e m
o
st
re
ce
nt
ly
se
le
ct
ed
ope
ra
ting
m
o
de
s
ele
ct
ion f
rom
b
ein
g
u
pda
te
d.
