Tellabs 6042 Technical Manual

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Ytellabs
technical manual
76-826042
revC
practice section 826042
©Tellabs, Inc., 3 September 1981
all rights reserved, printed in USA
6042 4W-2W DX-E&M Network
Terminating Module
1. general description
1.01 The 6042 4W-2W OX-E&M Network Ter-
minating Module (figure 1) provides signaling con-
version and transmission interface between a 4wire
metallic facility and a 2wire PBX tie trunk. Along
with active level control (gain or loss) in the transmit
and receive channels and active slope equalization
in the receive channel, the 6042 provides duplex
(OX) signaling (which is extended-range E&M
signaling) over simplex leads derived from the 4wire
facility, conversion between the OX signaling and
terminal-side E&M signaling, and extension of the
E&M signaling toward the 2wire termination. Con-
version from 4wire to 2wire operation is provided
via an integral toll-grade hybrid terminating set. The
6042 offers switch-selectable OX1 or OX2 opera-
tion with a choice of either Type I, Type II, or Type III
E&M interface. As a member of Tellabs' 262U
Universal Network Terminating System of modules
and enclosures, the 6042 fulfills Registered Facility
Interface Codes TL 11 E, TL 11 M, TL 12E, and TL 12M
for applications where the serving telephone com-
pany uses facility-side OX signaling.
1.02 This practice section covers the Issue 2 ver-
sion of the 6042 module (Tellabs part number
826042). The Issue 2 module differs from its Issue
1 counterpart in that OX2 operation is provided via
switch option, the transmit and receive gain and the
receive equalization ranges are revised, and power
requirements are reduced through use of low-
power OX-signaling circuitry. The practice is revised
to provide current regional office telephone num-
bers in section 7.
1.03 The 6042's transmit and receive amplifiers
each provide from -16 to +16dB of continuously
adjustable gain. Maximum output level of each chan-
nel is +12dBm, with no more than 1 % distortion.
1.04 Active slope equalization is available in the
module's receive channel to compensate for the
frequency response characteristics of loaded or
nonloaded cable. The module's equalizer can be
continuously adjusted from essentially flat (±0.5dB,
300 to 4000Hz, re 1000Hz) to 7.5dB (at 2804Hz,
re 1000Hz) via a front-panel control.
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contents
section 1
section 2
section 3
section 4
section 5
section 6
section 1
general description
application
installation
circuit description
block diagram
specifications
testing
&
troubleshooting
page 1
page 2
page 4
pagel
page 9
page 8
page 10
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figure
1.
6042 Network Terminating Module
1.05 Impedance-matching transformers facing
the 4wire facility can be independently switch-op-
tioned for balanced 1200-, 600-, or 150-ohm ter-
minating impedances. These transformers are cen-
ter-tapped to derive simplex leads required for DX
signaling; a switch option permits normal or re-
versed operation of these leads. Balanced, switch-
selectable 600 or gOO-ohm impedance (in series
with 2.15p F) is provided at the 2wire terminal-side
port.
1.06 The 6042 contains a low-power electronic
D X set designed for end-to-end use with conven-
tional relay-type DX sets or other electronic units.
Signaling range of the 6042 is 5000 ohms of exter-
nal loop resistance.
1.07 The 6042 can be switch-optioned for DX 1
or DX2 operation. With DX1 operation, M-Iead
signals are input to and E-Iead signals are output
from the module. With DX2, E-Iead signals are
input to and M-Iead signals are output from the
module. Either Type I, II, or III E&M lead inter-
facing (see figures 4 through 6 in section 2 of this
Practice) can also be switch selected. Please note
that while the Type I and II interfaces can be used
with either DX 1 or DX2 operation, the Type III
interface can only be used with D X 1.
1.08 The 6042 incorporates a resistive and capac-
itive OX balance network. This network can be
switch optioned to provide up to 6750 ohms of
balancing resistance (in 250-ohm increments) and
up to approximately 7p F of capacitance balance
page 1