practice
section
816047/826047
A
ANALOG
CARRIER
TMNS"'SSION
FACILITY
figure
3.
Typical
long-haul
analog
tie-trunk
circuit
using
6047
or
604
7A
1Tl.31
..
I'NTERF"CE
I
DIGITAL
CMAIER
MUUIPLEX
EQUIPMENT
I TL32M
I INTERFACE
I
...
figure
4.
Typicai/ong-haul
digital
tie-trunk
circuit
using
6047
or
604
7A
t(;V
amplifier provides
gain
to
derive internal
+7TlP
from
4wire
rev
input
level
rev
attenuator
provides
loss
to
derive
required
4wire
rev
output
level
from
internal +7TLP
4wire
receive
input
port
o
to
24dB
in
+7TLP
o
to
24dB
loss
4wire
receive
output
port
receive
path
FACILITY
SIDE
TERMINAL
SIDE
4wire
transmit
output
port
1
f-_.:-~1~6~T~L~P~_....,ro':::"¥dsl
1-----f---
..
---,I
a
to
24dB 0
to
24dB
11-_--<
..
__
+-
......
...
gain loss
transmit
path
xmt
amplifier provides
gain
to
derive required
4wire
xmt
output
level
from
internal-16TLP
l<mt
attenuator
provides
10$s
to
derive internal
-16TLP
from
2wire
input
level
figure
5.
Level coordination
in
6047
and
6047
A
the
loss necessary
to
derive the required terminal-
24dB
of loss in
0.1
dB increments. Thus, receive
side receive
output
ievel.
In
the
transmit channel, input TLP's from
-17
to
+7
can be
accommodated
the
terminal-side
attenuator
is set
to
provide the and receive
output
TLP's from
+7
to
-17
can be
loss necessary to derive a
-16TLP
within
the
mod- derived.
In
a similar manner,
transmit
input
TLP's
of
ule. This internal TLP is then used as a
reference
-16
to
+8
can be
accommodated
and
transmit
out-
as
the
moduie's facility-side
transmit
amplifier is put TLP's of
+8
to
-16
can be derived. Total
set
to
provide
the
gain necessary
to
derive
the
faciiity-side gain and total terminal-side loss intro-
required facility-side
transmit
output
level. Both duced
into
a channel are
the
respective sums of
facility-side amplifiers in the
6047
and
6047A
pro-
that
channel's front-panel
fac
gain
and
term
loss
vide
from
0
to
24dB
of gain in
O.ldB
increments.
switches
set
to
the
IN position. The overload
point
Both terminal-side
attenuators
provide from 0 to
at
all
four
ports
of
the
6047
and
6047
A is +5dBmO.
page 4
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