Dantel 44443 Manual de usuario
CAUTION
Install or remove modules from the shelf only when the power is off.
If you install a module in the shelf with the power on, the internal
circuitry may suffer damage and the product warranty will be void.
Remove and install circuit boards only in a static-safe environment
(use antistatic wrist straps, smocks, footwear, etc.).
Keep circuit boards in their antistatic bags when they are not in use.
Do not ship or store circuit boards near strong electrostatic, electromag-
netic, magnetic, or radioactive fields.
For more complete information on electrostatic discharge safety
precautions, refer to BellcoreTM Technical Reference #TR-NWT-000870.
Copyright 1998 by Dantel, Inc. • Dantel is a registered trademark of Dantel, Inc. • ISO 9001 Registered
Printed in the U.S.A.
INSTALLATION&OPERATION MANUAL
44443-1098<90-00059>
44443 FOUR-WIRE
TERMINATION SET
About this Practice:
This document has been reissued to:
• Renumber figures.
Issue date: October 1998
Reissued Practices: Updated and
new content can be identified by a
banner in the right margin.
UPDATED
Table of Contents
Ordering Information ........................................................................... 2
General Description.............................................................................. 2
Circuit Description ............................................................................... 2
Application Information ....................................................................... 6
Installation............................................................................................ 7
Operation ............................................................................................ 11
FCC Required Information ................................................................ 12
Technical Specifications ..................................................................... 13
Warranty ............................................................................................. 14
44443-XX
TERM SET
A11-44443-00
RCV ATTEN (dB)
OUT IN OUT IN
4 WIRE LINE
XMT RCV
2 WIRE DROP
XMT RCV
XMT ATTEN (dB)
OUT IN OUT IN
.125 .25 .5 1
24816
.125 .25 .5 1
24816
PAGE 2 44443-1098<90-00059>
ORDERING INFORMATION
GENERAL DESCRIPTION
The 44443-00 and 44443-01 Four-Wire Termination Sets
(Term Set) provide a compromise impedance matching
network for interfacing a 2-wire line to a 4-wire trunk or line.
The -01 option features an Idle Line Termination or Echo
Suppression override on the 4-wire transmit port.
The front panel includes dual inline (DIP) switches for setting
the 4-wire transmit and receive port attenuation and Bantam
jacks for test and calibration.
The Term Set normally functions with the Dantel 440 Communi-
cation Management System to interface 2-wire off-network lines
or PABX trunks to the 4-wire port of the 44023 PABX Line
Interface Module. The Dantel 44443 is also compatible with
units from several manufacturers and can be used in general
purpose termination set applications.
The 44443 Term Set is a plug-in printed circuit module that fits
into any 400-type, or similiar, equipment housing. The 44443-00
is a passive device which requires no supply voltage. The 44443-
01, while still a passive device, contains a relay. This relay (refer
to Fig. 1 in the Installation section) requires an external
voltage source.
NOTE: This section lists the different options available for this product. To order any of the avail-
able options, contact Dantel Inside Sales through our toll-free number, 1-800-432-6835.
OPTION NUMBER FEATURES
A11-44443-00 Term Set, Basic
A11-44443-01 Term Set, w/Echo Suppression or ILT Relay
CIRCUIT DESCRIPTION
T
he Dantel 44443 Four-Wire Termination Set functional
schematic is shown in Fig. 1.
44443-00
The basic Term Set consists of a compromise hybrid network
circuit with:
♦A balance network and Network Build-Out (NBO) circuit.
♦Switchable attenuator circuits for the 4-wire transmit (XMT)
port and the 4-wire receive (RCV) port.
♦Four (4) front panel test jack circuits.
CONTINUED . . .
44443-1098<90-00059> PAGE 3
CIRCUIT DESCRIPTION
FIG.1 -FUNCTIONAL SCHEMATIC,44443-00/-01FOUR-WIRE TERMINATION SET
600
J1 55
51
5
49
25
29
7
17
13
42
5
4
3
2
1
IN
K1A
NO
OUT
R6
49.9
K1B
R5
604
K1A
NC
I.L.T. E.S.
I.L.T.
BYPASS
OUT
K1
-
+
900
S2D
301
604
S3-8
S3-1
S3-2S3-3S3-1S3-4
S3-5
S3-6
T
GND
T
R
J2
4W
RCV
5
4
3
1
24-WIRE
RECEIVE
OUT 6
COM 1
IN 5
600
900
10
12
600
900
7911
S1C S1A 8
T1
900
600
S2C
162345
600 900
19
27
T2
900
600 S2A 600
900
S2B
7 9 11 12 10 8
IN 6
OUT 5
4W
XMT
COM 1
J3
2W
IN
5
4
3
1
2
47
41
5
1
2
J4
2W
MON
2-WIRE LINE
T
R
G LEAD
F LEAD
D LEAD
S1D
44443-01 OPTION
IDLE LINE TERMINATION/
ECHO SUPPRESSION
4-WIRE
TRANSMIT
K1 RELAY CIRCUITRY
NBO CIRCUIT
15
ATTENUATOR
AB CAP OUT IN
ATTENUATOR
BAL
NET
PAGE 4 44443-1098<90-00059>
Compromise Hybrid Network Circuit
In the operation of the Term Set, audible frequencies must be
received and transmitted between the 2-wire port and the appro-
priate 4-wire XMT port or 4-wire RCV port, while mutually
excluding the inappropriate 4-wire port. This is accomplished
using an impedance matching hybrid network consisting of two
cross-connected bridging transformers coupled with a balance
network and NBO circuit.
Transmit Mode
To transmit a signal from the 2-wire port to the 4-wire XMT port,
a voice frequency enters from pins 41 and 47 (2-wire line) and
flows through windings 2-3 and 4-5 of transformers T1 and T2.
Capacitors C11 and C12 (when used) complete a speech signal path
between the transformer windings and allow DC signaling to be
placed on the 2-wire line A, B, and/or D. Leads A, B, D, F, and G
are brought out to the 56 pin edge connector. The D lead is pro-
vided to allow an external signaling circuit to open and close the
path between the B and D leads.
The incoming voice signal divides equally between the secondary of
T1 and T2. The voice signal at the 4-wire RCV port is effectively
blocked by the output amplifier in the associated equipment. The
voice signal at the secondary of T2 is attenuated by a 600 ohm
switchable pad and applied to pins 55 and 49 at the
4-wire XMT port.
Receive Mode
In the receive mode, a voice frequency entering pins 5 and 15
(4-wire RCV port) is coupled to sindings 7-11 and 12-8 of T1
through a 600 ohm switchable pad. T1 and T2 are designed and
connected in such a way that equal currents are inducted into the
2-3 windings, the 4-5 windings, and the balance network 6-1
windings of both transformers.
The balance network winding 6-1 of T2 is phased to cancel the
magnetic flux in the core of T2. As a result of this phase cancella-
tion (or trans-hybrid loss), no voice signal is induced in the second-
ary windings 12-8 and 7-11 of T2. Therefore, the 4-wire XMT port
is effectively isolated from the 4-wire RCV port and 2-wire line.
To provide optimum trans-hybrid loss, the impedances terminat-
ing the 2-wire line and balance network must be equal. Half of the
voice signal is dissipated in the balance network and NBO and the
other half is applied to pins 41 and 47 (2-wire line).
Impedance matching for the Term Set network circuit may be set
up to 600 or 900 ohms. Optimum trans-hybrid loss is achieved by
selecting the appropriate capacitance combination of the NBO.
Also, an external NBO circuit may be connected to the Term Set
through pins 7 and 13. Refer to Table A, in the Installation
section.
CIRCUIT DESCRIPTION
44443-1098<90-00059> PAGE 5
RCV and XMT Attenuator Circuits
The attenuator circuits are made up of resistance T-pads. The
pads are designed to be switched into the 4-wire RCV and XMT
lines. Refer to Fig. 2, in the Installation section.
Front Panel Test Jack Circuits
The four front panel test jacks provide internal connections for test
and calibration of the Term Set.
44443-01
This module includes the basic Term Set network circuits of the
44443-00, plus selectable strap connections for engaging an Idle
Line Termination (ILT) branch or Echo Suppression Override (ES)
branch across the 4-wire XMT port. Refer to Fig. 1.
The branch circuit selected in is controlled by relay K1. K1 is
energized by an external battery supply (-21 VDC to -56 VDC)
applied to pin 25 (-) and pin 29 (+). Relay K1 is protected from
excessive current flow by transistor Q1. Using Q1 to limit current
eliminates the need for a resistive voltage drop for -24 or -48 VDC
supplies.
Idle Line Termination Circuit
When K1 is energized, the normally closed side of K1A opens and
the 600 ohm ILT branch is disconnected. At the same time, the
normally open side of K1A closes, establishing the transmission
path to pin 49.
When K1 is released at the end of the call, the normally closed side
of K1A closes, reconnecting the 600 ohm termination across the 4-
wire XMT line. At the same time, the normally open side of K1A
re-opens, isolating the 600 ohm termination branch.
NOTE: For the idle state to exist, the ILT bypass strap option should
not be used. Refer to Fig. 1
Echo Suppression Override Circuit
If K1 is energized, contact K1B is closed and connects a 50 ohm
load resistor across the 4-wire XMT line. This allows an override to
occur. If K1 is not energized, K1B remains open, disallowing an
override response.
NOTE: Since the K1A (normally open) contact would normally open the
XMT line, the ILT bypass strap must be installed to prevent
interruption. Refer to Fig. 1
CIRCUIT DESCRIPTION
PAGE 6 44443-1098<90-00059>
APPLICATION INFORMATION
T
?
(P1)
17
16
7
8
15
14
13
3
4
5
9
10
11
12
6
RCV {
{
XMT
TRUNK
"A" LEAD
"B" LEAD PABX
LINE
INTERFACE
44023
XMT
RCV
HI Z OUT
+7
"M"
LEAD
"E" LEAD
dBm
-16
dBm
-BATT.
(-21 TO -56 VDC)
GND
J2
J1
2W/4W
TERM. SET
44443
R
1
2
(P1) -4dBm
-6dBm
R
T
{
J4
RJ11
PHONEJACK
PABX
LINE
STATION
SELECTOR
49018
DTMF
DECODER
44020
*/#& BUSY
TONE
GENERATOR
J3
TIP/RING
REVERSED
SWITCH
DROP
LINE
Fig. 2 shows a 44443 Term Set as part of a 00331 DTSS3ON
Order Wire/PABX Interface. The 2-wire input of the Term
Set may be connected to:
♦A PABX.
♦An outside line.
♦Any other 2-wire communication line.
Impedance matching selection is provided with the balancing
network to match either a 600 ohm or a 900 ohm 2-wire line.
FIG. 2 - 00331 DTSS3ON FUNCTIONAL BLOCK DIAGRAM
44443-1098<90-00059> PAGE 7
INSTALLATION
I
nstallation consists of settings the switches and straps, wiring
the connectors (if necessary), mounting the module in the shelf,
and checking out the module.
Switch and Strap Options
Set the switches and straps using Fig. 3 and Table A.
FIG. 3 - 44443 TERM SET SWITCH AND STRAP LOCATIONS
44443-XX
TERM SET
A11-44443-00
RCV ATTEN (dB)
OUT IN OUT IN
4 WIRE LINE
XMT RCV
2 WIRE DROP
XMT RCV
XMT ATTEN (dB)
OUT IN OUT IN
.125 .25 .5 1
24816
18
ON
OPEN
600
900
S2
S3
AB CAP B INT
BYPASS
A INT
BYPASS
IN
OUT
IN
OUT
IN
OUT
.125 .25 .5 1
24816
IN
OUT
OUT
I.L.T.
BYPASS
I.L.T. ES
600
900
S1
PAGE 8 44443-1098<90-00059>
TABLE A - 44443 SWITCH AND STRAP OPTIONS
OPTION
Attenuation
Receive
Transmit
NBO (capacitors add)
2.2 nFd
4.7 nFd
8.2 nFd
15 nFd
33 nFd
68 nFd
600 ohms
900 ohms
Two-Wire Impedance
600 ohm
900 ohm
Idle Line Termination or Echo
Suppression Override (-01 only)
Idle Line Termination
Echo Suppression Override Only
Both Inactive
SWITCH OR STRAP
RCV ATTEN (front panel)
XMT ATTEN (front panel)
S3-1
S3-2
S3-3
S3-4
S3-5
S3-6
S3-8 (S2 on 600)
S3-8 (S2 on 900)
S1, S2 on 600
S1, S2 on 900
ILT Bypass OUT
Load Strap to ILT
ILT Bypass IN
Load Strap to ES
ILT Bypass IN
Load Strap to OUT
Wiring
Normally, the 44443 is used in a shelf that is pre-wired at the
factory. Fig. 4 shows the edge connector pin designations if wiring
is required.
Module Mounting
Install the module in the proper slot in the equipment housing by
sliding the module along the guide slots. Firmly seat the edge
connector in the receptacle.
Checkout
Table C provides check-out procedures for the 44443-00 and 44443-
01 Four-Wire Termination Sets. Refer to Fig. 3 for a view of the
front panel. Test equipment required for this procedure include:
♦Audio Oscillator, 600 ohm.
♦AC Voltmeter with decible scale.
♦Extender card, 400-type, 56-pin edge connector.
CONTINUED . . .
INSTALLATION
44443-1098<90-00059> PAGE 9
56 55
54 53
52 51
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
87
65
43
21
CIRCUIT SIDE
OF PC BOARD
COMPONENT SIDE
OF PC BOARD
4W XMT
D Lead
4W XMT
2W R
B Lead
A Lead
2W TGround
ILT Relay Positive Input, (-01 only)
G Lead
ILT Relay Negative Input, (-01 only)
F Lead
Ground
4W RCV R
External Balanced Network
External Balanced Network
4W RCV T
FIG. 4 - 44443 TERM SET PIN DESIGNATIONS
INSTALLATION
PAGE 10 44443-1098<90-00059>
The procedure assumes the Term Set is switched to the 600 ohm,
2-wire line. For accurate readings, use fixed resistors for calibra-
tion loads in place of connecting lines or equipment. Set signal
source levels across fixed resistors before connecting to the module.
NOTE: If the Term Set is switched to the 900 ohm, 2-wire setting,
substitute 900 for 600 when used in reference to the 2-wire
line.
Abbreviations:
♦600 T = Terminate in 600 ohm load.
♦600 B = Bridging Unloaded measurement using 600 ohm refer-
ence scale (dBm).
TABLE B - 44443-00/-01 CHECK-OUT PROCEDURE
RESULTS
Measure XMT tone level. Adjust XMT
attenuator front panel switches for re-
quired level. (0 dBmO)
Measure 2-wire transmit tone level. Adjust
RCV attenuator front panel switches for re-
quired level. (0 dBmO)
Measure minimum tone level. Adjust
S3-1 thru S3-6 for minimum level.
ACTION
Remove Term Set and insert extender card
in its place. Insert Term Set into extender
card.
When aligning -01, energize ILT relay. (Do
not energize if strapped for Echo Suppres-
sion Override.)
Use AC voltmeter (600 T) to set 1 KHz, 600
ohm tone source for 2-wire receive test tone
level per system requirement (0 dBmO). Re-
move meter and insert source at 2W IN jack.
Insert AC voltmeter (600 T) at 4W XMT jack.
Remove source and AC voltmeter. Use AC
voltmeter (600 T) to set source for 4W RCV
test tone level per system requirement
(0dBmO). Remove meter and insert source at
4W RCV jack.
Insert AC voltmeter (600 T) at 2W IN jack.
Remove meter but leave source connected to
4W RCV jack.
Insert AC voltmeter (600 T) at 4W XMT jack.
(Be sure that 2-wire side is connected to sys-
tem equipment or line.)
Remove test equipment. Normalize the ILT
relay and return the Term Set to normal
configuration.
STEP
1
2
3
4
5
6
7
8
9
INSTALLATION
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