Ytellabs
technical manual
76-816166
rev A
practice section 816166/816166N816166B/816166C
©
Tellabs, Inc., 1 July 1984
all rights reserved, printed in USA
6166, 6166A, 61668, and 6166C 4Wire-to-4Wire
DX-to-E&M Terminal Repeaters
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contents
section 1 general description
1.
general description
1.01
The 6166, 6166A, 6166B, and 6166C 4Wire-
to-4Wire DX-to-E&M Terminal Repeater Modules are
Tellabs Type 10 plug-in modules that provide both
transmission interface, and DX-to-E&M signaling
conversion between a 4wire PBX trunk or carrier
channel and a4wire metallic facility. The 6166X mod-
ules meet the specifications given in AT&T Technical
Reference Pub 43002 for Network Channel Ter-
minating Equipment (NCTE) Criteria, and (in the
cases of the 6166A and6166C) Pub43004 forTrans-
mission and Signaling Loopback Criteria.
1.02
In the event that this practice section is re-
issued, the reason for reissue will be stated in this
paragraph.
1.03
While all four 6166X NCTE modules are
basically the same, some are without loopback or
front-panel jacks. The differences between these
modules are listed in table 1.
module
front-panel jacks
loopback
6166
yes
no
6166A
yes
yes
61668
no
no
6166C
no
yes
table 1. 6166X-family module selection guide
1.04
The 6166X-family modules offer the follow-
ing features:
•
From -24 to +24dB of prescription-set gain in
both the transmit and receive channels.
• Receive-channel amplitude equalization (equiv-
alent to WECo 309B equalizer).
•
Isolation transformers at all terminal and facility
side ports.
•
Independently switch-selectable impedances of
600 or 1200 ohms at all ports.
• Switch-selectable Type I, II, or II I E& M interface.
• Switch-selectable DX1 or DX2 operation.
• 0 to 7 uF of balance network capacitance,
switch-selectable in 1uF increments.
•
From 0 to 6750 ohms of OX loop-signaling
resistance,
switch-selectable
in
250
ohm
increments.
• Front-panel LED's that indicate local E-Iead and
M-Iead status.
• Simplex-lead reversal switch.
•
M-Iead current limiting.
page 1
tigure 1. 6166A
4 Wire-to-4 Wire DX-to-E&M
Terminal Repeater Module
• Reverse-voltage and overvoltage protection.
•
Switch-selectable
midpoint capacitance
be-
tween facility simplex leads.
• Opening and monitoring bantam-type jacks on
the input ports and opening bantam-type jacks
at the output ports (6166 and 6166A only).
•
Local or remote equal-level loopback (6166A
and 6166C only).
1.05
The loopback circuitry on the 6166A and
6166C provides the following features:
•
Manually activated (local) loopback via option
switch.
•
Manually activated (local) loopback via ground
on the MLB lead or contact closure between
the MLB and MLBG leads.
• Tone-activated (remote) loopback (2713 Hz)
with second-tone deactivation.
• Automatic deactivation of tone loopback after
switch-selectable 4-minute or 20-minute time-
out interval, if desired.
• From -23 to +24dB of prescription-set gain in
the loopback path in 1dB increments.
• Option switch for busying out module's terminal
side during loopback, if desired.
• Front-panel loopback-status-indicating LED.
2.
application
2.01
The 6166X-family modules are typically
used to extend E&M signaling of a trunk over the dis-
tance needed to provide trunks to customer's pre-
mises from a PBX or CO (such as for a tie trunk or a
carrier channel). No external transmission interface
circuitry is needed since the 6166X-family modules
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