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Ytellabs
technical manual
76-816041
rev A
practice sectio n 816041
© Tellabs, Inc., 1 December 1981
all rights reserved, printed in USA
6041 Network Terminating Module
page 1
page 2
page 3
page 5
page 6
page 5
page 7
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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.
general description
1.01
The Tellabs 6041
Network Terminating
Module (figure 1) provides signaling conversion and
transmission interface between a 2wire metallic
transmission facility and a 2wire PBX trunk. Spe-
cifically, the 6041 provides extended-range E&M
(DX) signaling over A and B leads derived from the
2wire facility, conversion between that DX signaling
and terminal-side E&M signaling, and extension of
this E&M signaling toward the 2wire termination.
Transmission interface is accomplished via an
integral repeat coil. This module is designed to
provide DXl operation with a choice of either
figure 1.6041 Network Terminating Module
Type I or Type II E&M-Iead interfacing. When
optioned for Type II interfacing, DX2 operation
midpoint capacitors. The balancing network can
can also be accommodated. As a member of
be switch-optioned to provide up to 6750 ohms of
Tellabs'
262U
Universal Network Terminating
balancing resistance (in 250-ohm increments) and
System of modules and enclosures, the 6041 fulfills
up to approximately 6p F of capacitive balance (in
Registered Facility Interface Codes TL 11M and
2pF increments). The A&B-Iead midpoint capaci-
T L 12M in applications where the telephone com-
tors associated with the facility (OX signaling) side
pany uses DX signaling over the 2wire facility.
of the 6041 can be switch-optioned for 0, 2, or
1.02
In the event that th is Practice section is re-
4p F of capacitance.
issued, the reason for reissue will be stated in this
1.07
An impedance-matching transformer facing
paragraph.
the 2wire facility can be switch-optioned for bal-
1.03
The 6041 contains an electronic DX set
anced 600 or 900-ohm terminating impedance.
designed for end-to-end use with conventional re-
This transformer is center-tapped to derive the A
lay-type DX sets or other electronic units. Maxi-
and B leads required for DX signaling. A switch
mum DX signaling range is 5000 ohms of external
option permits normal or reverse operation of these
loop resistance.
leads. Fixed 600-ohm impedance (in series with a
2p F capacitive component) is presented at the
1.04
The 6041 is designed to operate in the DXl
6041's 2wire terminal-side port.
mode, in which M-Iead signals are input to and E-
lead signals are output from the module. Either
1.08
A dial-pulse-trimming potentiometer on the
Type I or Type II E&M-Iead interfacing may be
module's printed circuit board compensates dial
switch-selected. In general, Type I interfacing is
pulse make/break ratios for optimum performance.
used with electromechanical switching systems,
The 6041 accommodates dial pulsing speeds of 8
while Type II interfacing is used in electronic switch-
to 14 pulses per second (pps).
ing environments. Flgures 2 and 3 in section 2 of
1.09
Four test points on the front panel of the
this Practice show Type I and Type II E&M-Iead in-
6041 allow test access to the module's signaling
terfacing arrangements, respectively.
leads (E, M, SG, and SB).
1.05
When the 6041 is optioned for Type II E&M-
1.10
The 6041 is designed to operate on filtered
lead interfacing, DX2 operation (M-Iead output,
-44 to -56Vdc input. Nominal current require-
E-Iead input) can be implemented via an external
ment (at -48Vdc input) is 60mA. Maximum cur-
wiring change (see paragraphs 2.03 and 3.04).
rent requirement (at -52Vdc input) is 75mA.
Figure 4 in section 2 of this Practice shows the
1.11
A Type 10 module, the 6041 mounts in
Type II/DX2 interfacing arrangement.
one position of a Tellabs Type 10 Mounting Shelf,
1.06
The 6041 incorporates a resistive and ca-
versions of which are available for relay rack or ap-
pacitive DX balancing network as well as A&B-Iead
paratus case installation. In relay rack applications,
page 1
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