'irtellabs
technical manuai
76-826047A
rev B
practice section
816047/826047
A
©Tellabs, Inc., 2
October
1983
all rights
,~
~
--
..
_~
'1rinted in USA
6047
and
6047
A 4Wire-to-4Wire SF-to-E&M
Network
Terminating
Modules
page
1
page
3
page 9
page
14
page
22
page 18
page
19
contents
section 1
general
description
section 2
application
section 3 installation
section
4
circuit
description
section
5
block
diagram
section
6
specifications
section
7 testing
and
troubleshooting
1.01
general
description
1.01
The
6047
4Wire-to--4Wire SF-to-E&M Net-
work
Terminating
Module
with Gain and
the
6047
A
4Wire-to--4Wire SF-to-E&M
Network
Terminating
Module
with Gain and Loopback (figure
1)
each
provide signaling and transmission interface be-
tween a
4wire
facility that uses single-frequency
(SF) signaling and a
4wire
trunk
(typically, a PBX
trunk)
or
a
4wire
line
that
uses E&M signaling. Both
modules provide active level control in
the
transmit
and receive paths, receive-path amplitude equal-
ization, and full-duplex conversion between
the
SF
signaling on
the
facility and the E&M signaling on
the
trunk
or
line. Conventional
2600Hz
SF tone is
supplied
by
an integral oscillator. The
6047
and
6047
A differ from ordinary
4wire
E&M SF signaling
sets in
that
they
contain integral amplifiers
to
accommodate a variety of facility interface levels.
Unlike
the
6047,
the
6047
A contains integral loop-
back
circuitry
that
facilitates local
or
remote testing
of both
the
module and
the
facility.
As
members of
Tellabs'
262U
Universal
Network
Terminating Sys-
tem of modules and enclosures,
the
6047
and
6047A
each fulfill Registered Facility Interface
Codes
TC31
E,
TC31
M,
TC32
E,
TC32
M,
TL31
E,
TL31
M,
TL32E, and TL32M for network-terminating
applications
where
the
serving
telephone
company
uses SF signaling.
1.02
In
the
event
that
this
practice
section
is
re-
issued,
the
reason
for
reissue will be stated in this
paragraph.
1.03 Features and options of
the
6047
and
6047
A include
the
following: full prescription align-
ment capability; balanced, switchable 1200, 600,
or
150-ohm terminating impedances on
the
facility
side; fixed, balanced 600-ohm terminating imped-
ances on
the
terminal side; facility-side amplifiers
and terminal-side attenuators for interface with a
variety
of
levels; active slope-type receive equaliza-
tion; switch-selectable A-side
or
B-side E&M signal-
ing; switch-selectable Type
I,
II,
or
III
E&M
interface;
minimum-break transmit and receive pulse correc-
tion; and an integral sealing-current source. The
6047
A alone contains
the
aforementioned loop-
back
circuitry
with both local (manual) and remote
(two-tone) loopback-state control. Except for this
difference,
the
two
modules are identical.
page 1
figure
1.
6047 and 6047A 4
Wire-to-4
Wire
SF-to-E&M
Network Terminating Modules
1.04 Prescription-set transmit and receive ampli-
fiers on
the
facility side of
the
6047
and
6047
A
allow each module
to
interface
the
SF signaling
facility directly,
i.e.,
without
a separate facility-side
line amplifier. These integral amplifiers, in conjunc-
tion with prescription-set transmit and receive
attenuators on
the
terminal side, provide for full
coordination between facility-side and terminal-
side levels. Both facility-side amplifiers on each
module provide from 0
to
24dB
of gain in switch-
selectable
O.ldB
increments, and both terminal-
side
attenuators
provide from 0
to
24dB
of loss in
switch-selectable
0.1
dB
increments.
In
the
receive
channel, input TLP's (transmission level points)
from
-17
to
+7
can be accommodated and
output
TLP's from
+7
to
-17
can be derived.
In
the
transmit channel, input TLP's from
-16
to
+8
can
be accommodated and output TLP's from
+8
to
-16
can be derived. The overload
point
at all
four
ports of the
6047
and
6047
A is +5dBmO.
1.05
An
active slope equalizer
for
nonloaded
cable in
the
receive channel of
the
6047
and
6047
A permits from 0
to
7.5dB of equalized gain
to
be introduced at
2804Hz
(re 1004Hz) in switch-
selectable 0.5dB increments. Because this equal-
izer
does
not affect
1004Hz
levels, equalization
can be introduced not only before but also
after
receive-channel levels
are
set, with no
interference
between level and equalization adjustments.
1.06 Transformer coupling is provided at all
four
ports of the
6047
and
6047
A The
two
facility-side
transformers on each module can be indepen-
dently
switch-optioned for balanced 1200, 600,
or
150-ohm terminating impedance, while
the
two
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