2.12 The
6162X
module
uses relay
contacts
to
derive E-Iead and M-Iead signaling. This facilitates
interfacing
with
nonstandard E-Iead and M-Iead
voltage levels and polarities.
When
these
modules
are used
with
Type
II
E&M interface, terminal-side
equipment
can use
any
convenient
voltage
or
polarity.
2.13 Generally, if
loopback
is
to
be used,
the
terminal-end
module
will be
the
one
requiring loop-
back
capabilities (6162A
or
6162C). Equal-level
loopback
is made possible via
the
loopback
level
switches,
which
provide from
-23
to
+24dB
of
gain
in
1
dB
increments. The
loopback
circuitry
also pro-
vides signaling
loopback
functions
for
remote
test-
ing
of
the
SF and E&M signaling circuitry.
Some
examples of signaling
loopback
use
are
as follows:
A.
After loopback is initiated,
2600Hz
tone
is
transmitted toward the terminal end at
-10dBmO
and again at
-20dBmO.
In both cases,
the
receive channel should
echo
back
an SF
tone
at
-20dBmO
after an initial
400ms
tone
burst at
an
augmented level of
-8dBmO.
B.
Pulsed SF
tone
is transmitted
toward
the
ter-
minal end. The receive
channel
should
echo
back
pulsed SF
tone
at anominal 58% break.
2.14 Several modes of
loopback
initiation and
removal are available; all are
selected
via
option
switches. These
modes
are
described
in
section
3
of this practice.
3.
installation
inspection
3.01 The
6162X
4Wire-to-2Wire SF-to-E&M Ter-
minal
Repeater
module
should be visually inspec-
ted upon arrival
to
find any
damage
incurred
during
shipment. If
damage
is noted, aclaim
should
immediately be filed with
the
carrier. If stored,
the
module
should
be visually
inspected
again
prior
to
installation.
mounting
3.02 The
6162X
mounts
in
one
position
of
a
Tellabs Type
10
Mounting
Shelf, in
one
position
of
a
Tellabs
262U
Universal
Network
Terminating Sys-
tem Assembly,
or
in
one
position
of
aTellabs
260A
Signaling and Terminating System Assembly, all
of
which are available in
configurations
for
relay-rack
and apparatus-case installation. The
module
plugs
physically and
electrically
into
a56-pin
connector
at
the
rear of its
shelf
or
assembly position.
3.03 In applications
where
a
6162X
module
is
to
be installed
in
a
262U
Assembly, no additional con-
nections
need be made. This is
because
all
of
the
assembly's internal
connections
are factory-
prewired and because external
wiring
is simplified
through
the
use of female
25-pair
connector-ended
cables arranged in
accordance
with
Universal Ser-
vice
Order
Code (USOC) RJ2HX. If
the
customer's
terminal
equipment
is cabled in
accordance
with
USOC RJ2HX,
direct
connection
between
the
262U
Assembly and
the
customer's
equipment
is
possible. If not,
cross-connections
between
the
practice
section
816162/816162A/816162B/816162C
assembly
and
the
local
terminal
equipment
must
be made
at
an
intermediate
connectorized
terminal
block
or
by means of an
optional
adapter
cable
available as alist
number
for
the
262U
Assembly.
installer
connections
3.04
When
a
6162X
module
is
to
be installed in a
conventional
Type 10 Shelf,
external
connections
to
the
module
must
be made.
Before
making any
connections
to
the
mounting
shelf
or
assembly,
make sure
that
power
is
off
and
modules
are
removed.
Modules
should
be
put
into
place
only
after
they
are
properly
optioned
and
after
wiring is
completed.
3.05 Table 5lists external
connections
to
the
6162X
module. All
connections
to
non-prewired
mountings
are made via
wire-wrapping
to
the
56-
pin
connector
at
the
rear
of
the
module's
shelf
or
assembly
position. Pin
numbers
are
found
on
the
body
of
the
connector.
connect:
to
pin:
4WIRE RCV TIP , 7
4WIRE RCV RING
13
4WIRE XMTTiP
41
4WIRE XMT RING
47
4WIRE RCV SX .......
..
...........
..
................
..
9
4WIRE XMT SX
43
2WIRE TIP (terminal side)
55
2WIRE RING (terminal side)
49
EXTERNAL PBN 5
and
15
Alead
51
Blead 3
Elead
23
Mlead
21
SB lead 1
SGlead
19
MLB
(manual loopback) 18
MLBG
(manualloopback
ground)
37
-BAIT
(-43
to
-52Vdc
filtered input)
35
GND (ground) 17
table
5.
External
connections
to
6162X
option
selection
3.06 A
number
of
option
switches
must
be set
before
the
6162X
can
be
placed
into
service.
These
switches
and
their
functions
are
described
in paragraphs 3.07
through
3.12. The
locations
of
the
switches
on
the
module's
printed
circuit
board
are
shown
in
figure
10. Table 6
summarizes
all
switch
options
and provides a
convenient
checklist
for
optioning
the
module.
impedance
matching
3.07 Two-position
slide
switches
S1
and
S2 on
the
main board
select
balanced
terminating
im-
pedance
of
either
600
ohms
or
1200
ohms
for
each
of
the
module's
facility-side ports as follows:
switch
port
81
receive
input
(facility
side)
S2
transmit
output
(facility
side)
Option
the
facility-side ports (rev in and
xmt
out) for
1200
ohms when interfacing loaded
cable
or
for
600
ohms when interfacing nonloaded cable or
carrier.
page
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