pair and is deactivated
by
application of a second
2713Hz tone. With two-tone loopback,
the
6047
A
can be further optioned
for
no timeout,
i.e.,
for loop-
back deactivation
by
application of a second tone
only,
or
for automatic loopback deactivation
after
a
2.6-minute
or
20.8-minute
timeout
interval
if
no
second tone is applied prior
to
expiration of the
interval. Another loopback-related switch option
conditions
the
6047
A
to
busy
out
the
associated
terminal
equipment
(with A-side signaling and Type
I E&M interface only) during loopback
to
prevent
the
trunk
circuit
or
line circuit from being inadver-
tently
seized. A prescription loopback-Ievel-control
circuit introduces from 0
to
23dB
of loss
or
gain
into
the
loopback path in switch-selectable incre-
ments
(23dB
loss; 0.5,
1.5,3,
6,
and
12dB
gain)
to
provide
true
equal-level loopback.
practice
section
816047/826047
A
terminal-side transformers each provide fixed, bal-
anced
600-ohm
terminating impedance. All four
transformers on each module are center-tapped
to
derive balanced simplex leads. The 150-ohm facility-
side impedance options provide approximately
2dB
of slope equalization (in the receive channel,
this
is
in addition
to
any provided
by
the
active slope
equalizer) when
the
facility-side ports interface
long sections of nonloaded cable.
1.07
An
integral sealing-current source on each
module can be switch-optioned into
the
circuit for
application of nominal
20mA
sealing
current
to
me-
tallic facility-side pairs Switching
the
internal sealing-
current
source
out
of
the
circuit provides access
to
the
facility-side simplex
leads
These leads can be
used,
for
example,
to
apply sealing
current
to
the
facility-side pairs from a source external
to
the
module.
1.14
Both the 6047 and 6047A contain an integral
1.08 The transmit portion of
the
6047
and
6047
A
2600Hz
SF signaling
tone
oscillator and
therefore
converts de
input
signals to outgoing SF tone do not require an external (master)
SF
tone source.
signals. A minimum-break transmit pulse
corrector
Provision for use of master oscillator, however, is
ensures transmission of recognizable tone pulses. available via factory modification.
A transmission-path-cut circuit with a nominal 1.15
In
addition
to
precision facility-gain and ter-
15ms pre-cut delay interval prevents transient minai-loss DIP switches
for
both channels,
the
front
interference
with outgoing signaling tones. panel of each module contains E-Iead and M-Iead
1.09 The receive portion of
the
6047
and
6047A
busy-indicating LED's and seven bantam-type
test
converts incoming SF tone signals
to
de output jacks. Opening jacks facing
the
module are pro-
signals. A minimum-break receive pulse
corrector
vided at all
four
ports, and monitoring jacks bridg-
ensures transmission of recognizable de pulses. ing
the
transmission pair are provided at
the
two
Recognition delays prevent response
to
spurious input ports. The seventh
jack
is an E&M-Iead break-
SF tone bursts and to momentary tone interruptions. ing (opening) jack. The
front
panel of
the
6047
A
1.10 When
the
6047
or
6047A
is optioned for
A-
also contains a loopback-active LED.
side (conventional terminal-side) E&M signaling, 1.16 Both modules
operate
from filtered, ground-
the
transmit portion of the module converts incom- referenced
-22
to
-56Vdc
input. Maximum current
ing M-Iead states
to
outgoing SF tones, and
the
requirements range from
86mA
at idle
to
95mA
receive portion converts incoming SF tones
to
when busy, with
an
additional
25mA
required when
outgoing E-Iead states. When the module
is
op-
the
internal sealing-current option is selected and,
tioned
for
B-side (also referred to as "facility-side") for
the
6047
A only,
another
40mA
required when
E&M signaling,
the
transmit portion converts in- loopback is activated.
coming E-Iead states
to
outgoing SF tones, and
the
1.17 The
6047
and
6047A
are Type
10
modules.
receive portion converts incoming SF tones
to
As such, each module mounts in one position of a
outgoing M-Iead states. Tellabs Type
10
Mounting Shelf, versions of which
1.12
When the
6047
or
6047A
is
optioned for
are
available for relay-rack and apparatus-case
either
A-side
or
B-side
E&M
signaling, it can also be installation.
In
relay-rack applications, up
to
12
optioned
for
Type I (single-lead)
E&M
interface, modules can be mounted across a 19-inch rack,
which is often used with electromechanical switch- while up
to
14 modules can be mounted across a
ing systems,
or
for Type
II
(looped-signaling-lead) 23-inch rack. In
either
case, 6 inches of vertical
E&M interface, which is often used with electronic rack space is used.
switching systems. With A-side signaling only, the 1.18 Both
the
6047
and
6047A
are
members of
6047
and
6047A
are
compatible with a Type III Tellabs'
262U
Universal
Network
Terminating Sys-
(looped) E&M interface when optioned for Type
I.
tern of modules and enclosures. Thus, each module
1.13 Unlike
the
6047,
the
6047A
contains in- can also be mounted in any
of
Tellabs'
prewired
tegral loopback
circuitry
that
loops
4wire
receive
262U
Mounting Assemblies, versions of which
are
input signals back
to
the
4wire
transmit
output
port
available for relay-rack and apparatus-case instal-
for
testing of signaling and transmission within
the
lation. For details, please refer
to
Tellabs'
262U
module and also on
the
facility. Switch options System brochure.
In
addition,
the
6047
and
6047A
allow a
choice
of manual
or
two-tone loopback. can be used in
the
prewired mounting assemblies
Manualloopback
is activated and deactivated via a of Tellabs'
262
Network
Terminating System and
DIP switch on
the
6047's
loopback subassembly.
260A
SF Signaling and Terminating System. For
Two-tone loopback is activated
by
application of details, please refer
to
the
Tellabs
brochures
and
nominal
2713Hz
tone
to
the
4wire
receive input practices on
the
262
and
260A
Systems.
page 2
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