Dantel 44022-00 User manual

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
44022-00-0898<90-00023>
44022-00
SUBSCRIBER LINE
INTERFACE MODULE
About this Practice:
This document has been reissued to:
• Update Figs. 2 and 4.
Issue date: July 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 ....................................................................... 8
Installation.......................................................................................... 12
Operation ............................................................................................ 16
Technical Specifications ..................................................................... 17
Warranty ............................................................................................. 18
44022-00
STATION
INTERFACE
GND
LINE
DROP MON
TRANSMIT
DIST
GND
LINE
DROP MON
RECEIVE
DIST
Busy
Inc. Call
Off Hook
B11-44022-00 REV__
TEST RST

PAGE 2 44022-00-0898<90-00023>
ORDERING INFORMATION
GENERAL DESCRIPTION
The 44022 Subscriber Line Interface Module (44022) interfaces a subscriber telephone to a four-wire port. The
44022 also provides group or all-call capability for the Dantel
00330 DTSS3A Selective Signaling Order-Wire Terminal.
The 44022 comes with with two model options, the 44022-00 and
the 44022-10. This practice covers only the 44022-00. The
44022-10 is covered in a separate practice. The 44022-00 is
recommended for applications that do not require an external
ringing generator. The 44022-10 should be used in all applica-
tions requiring an external ringing generator.
The 44022 is a plug-in printed circuit module that fits into any
400-type or similar equipment housing. The 44022 does not
accept subassemblies.
The front panel includes:
♦Operational status indicating LEDs
♦Calibration test points
♦Test jacks
♦Level controls
♦A test/reset switch
The 44022 operates on -21 to -56 VDC input power.
CIRCUIT DESCRIPTION
T
he Decoder Module circuitry consists of three sections:
audio, signaling/control and power regulator. Fig. 1 shows the
44022 Subscriber Line Interface Module audio section functional
schematic. Fig. 2 shows the 44022 Subscriber Line Interface
Module signaling/control section functional schematic.
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
B11-44022-00 Subscriber Line Interface
A11-44022-10 Subscriber Line Interface

44022-00-0898<90-00023> PAGE 3
FIG.1-FUNCTIONAL SCHEMATIC,44022SUBSCRIBER LINE INTERFACE MODULE,AUDIO SECTION
CIRCUIT DESCRIPTION
37 27
2
4
8 9
10 11 36
32
38 40 34
41
47 42
35 17
7
DROP MON
13 51
DROP
MON
53
23
SPK. MONITOR OUT
MONITOR CNTL
IN
OUT
T1
RCV
LINE
PAD
IN
OUT
T1
RCV
LINE
PAD
DIST
LINE 4W RCV
MUTE
SUMMING
INPUTS
BUSY ENABLE
ALERT TONE
BUSY TONE
MANUAL CLR
OFF HOOK TONE
OFF HOOK ENABLE
ALERT ENABLE
ON HOOK TONE
ON HOOK ENABLE
RING BACK TONE
RING-BACK ENABLE
LINE 4W XMT
DISTRIBUTION
OUTPUT
OFF-HOOK
SENSE
RING TRIP
SENSE
R38
DROP 4W RCV
T3
600 600
00
IMPEDANCE
4W
4W
2W2W
IN
OUT
SIDE
TONE
RING
RELAY
SUBSCRIBER
LOOP
INTERFACE
CIRCUIT LINE
DRIVERS
6
POWER
REGULATOR
RING TRIP
GND
-21 TO -56 VDC
BATTERY
SENSE ADJ
NOTE: IF RING GENERATOR SHOULD BE USED, THE 44022-00 MODULE MUST BE REPLACED WITH A 44022-10 MODULE
DROP 4W XMT
OR
2W XMT/RCV
RING GENERATOR INPUT (See Note Below)
MAN OFF HOOK -V TO K1 -20 VDC
-10 VDC -8 VDC
-22 VDC
TALK BATT.
-8 VDC
COMPARATOR
&
LEVEL CLAMP
25
PAD
31

PAGE 4 44022-00-0898<90-00023>
FIG.2-FUNCTIONAL SCHEMATIC,44022SUBSCRIBER LINE INTERFACE MODULE,SIGNALING/CONTROL SECTION
CIRCUIT DESCRIPTION
UPDATED
33
FORCED
DISCONNECT
19
BUSY
BUSY
IN OUT
PRIVACY
39 16 14
DELAY
DELAY
MAN CLR ENABLE
ALERT CKT
USAGE
1/3 SEC.
DELAY 1.5 SEC
TIMER
BUSY TONE EN
EXTERNAL BUSY LIGHT
L
ONE
SHOT
22
TEST SW
CLR
PWR-UP CLR
MAN CLR
1/3 SEC.
DELAY
1/3 SEC.
TIMER
90 SEC.
TIMER
1/5 SEC.
TIMER
3
21
LATCH
REMOTE M LEAD CONTROL
IN OUT
24
GP
CALL
DELAY
DELAY
28 30
1
LATCH
S
CQ
LATCH
S
C
Q
DELAY ON
DELAY OFF
S
C
Q
OFF
HK
D R
I
V E
R
29
K1
INC
CALL
BATT.
12
ALERT CKT USAGE
OFF-HOOK EN
MUTE EN
M LEAD
ON-HOOK EN
CALL LITE
BATT.
RGBK EN
RING TRIP
BUZZER
RESET OUT
ALERT EN
OFF-HOOK
-22 VDC
ALL
CALL
26

44022-00-0898<90-00023> PAGE 5
AUDIO SECTION
The audio section consists of a receive circuit, an active hybrid
integrated circuit, and a transmit circuit. Refer to Fig. 1.
Here is a brief description of each of the functional parts of the
circuit:
Receive Circuit
An incoming signal enters at the four-wire line receive input (pins
2 and 4) or at one of the summing inputs (pins 8, 9, 10 or 11).
Signals at the four-wire receive input couple through the trans-
former (T1), pass through a strappable 10 dB pad and then com-
bine with signals from the summing inputs. The signals route to a
monitor circuit and a mute FET.
NOTE: Strap the 10 dB pad IN to prevent high level signals from
falsely turning on the mute FET. Strap the 10 dB pad OUT
only when incoming signal levels are too low to meet output
level specifications. Pad strapping does not apply when you only
use the summing inputs.
The monitor circuit provides an output (pin 37) that drives a
speaker amplifier. A ground at pin 27 enables the monitor output.
The monitor output mutes when you remove the ground from pin
27.
The signal passing through the mute FET goes through a variable
gain amplifier to an impedance strap option. If you strap the
impedance for 0 ohms, the signal couples to the four-wire receive
drop output (pins 7 and 13) through transformer T3 and the drop
receive test jacks.
When you strap the impedance for 600 ohms, the signal routes to
the two-wire/four-wire strap. The signal couples through trans-
former T3 to the four-wire drop receive output when the strap is in
the four-wire position.
Active Hybrid Integrated Circuit
In the two-wire position, the signal routes to the solid state active
hybrid integrated circuit (IC). This circuit provides two-wire
receive/transmit signal combining and loop current sensing for the
phone. The signal passes through line driver transistors, the
closed ringing relay contacts (K1) and the drop transmit test jacks
to pins 51 and 53.
Transmit Circuit
Voice input enters at the two-wire/four-wire drop transmit input
(pins 51 and 53). The voice input passes through the drop transmit
test jacks and the closed K1 contacts, and goes into the active
hybrid IC.
CIRCUIT DESCRIPTION

PAGE 6 44022-00-0898<90-00023>
The signal passes out the other side of the IC to an amplifier and a
mute FET. At the other side of the FET, the signal splits between
the side-tone feedback path and a variable-gain output amplifier.
The side-tone feedback path has a strap option that allows side-
tone defeat when you use a two-wire phone.
The output amplifier provides an output signal to both the four-
wire line transmit output (pins 41 and 47) and the distribution
output (pin 42). Signals at the four-wire transmit output pass
through a strappable 10 dB pad and couple through transformer
T3.
SIGNALING/CONTROL SECTION
The signaling/control section consists of a busy circuit, an incom-
ing call circuit and a clear circuit. Refer to Fig. 2.
NOTE: If an external ringing generator is to be used, refer to the 46022-
10 documentation.
Busy Circuit
The first stage of the incoming call procedure is circuit busy. A
logic 1 (ground or 0 VDC) applies to the busy input (pin 22). If the
privacy strap is in, the circuit BUSY LED lights up and the
external busy light output (pin 19) turns on (ground). The lamp
lead (pin 12) also turns on (battery).
A busy tone enable turns on the busy FET which connects the
busy tone to the receive circuit so you hear it when you pick up the
phone. The # busy circuit can also hold the mute FETs on and
inhibits M lead (pin 21) operation. This capability is not normally
used in the order wire circuit.
Incoming Call Circuit
Receive an incoming call by grounding the station-call (pin 24), the
group call (pin 26), the all-call (pin 28) or the E lead (pin 1) input.
Three actions occur as the result of an incoming call:
♦Relay K1 operates.
Relay K1 contacts connect an external ringing supply at pins
23 and 31 to the telephone at pins 51 and 53. The ISM is only
used with a DTSS3A package. When used with a true ring
circuit, the ring ON is 2 seconds and the ring OFF is 4 sec-
onds.
If you configure the DTSS3A system with a 44028 Common
Order-Wire Module then you can strap relay K1 for an inter-
rupt rate of one second on and two seconds on or two seconds on
and one second off.
CIRCUIT DESCRIPTION

44022-00-0898<90-00023> PAGE 7
The front panel INC CALL LED follows the ringing cycle. The
lamp lead and buzzer lead (pin 29) outputs also follow the ring-
ing cycle. In the order-wire application, the 46022 uses the
buzzer lead. Ringing is not applied.
♦The ring-back tone enable operates.
The ring-back tone enable operates an FET that allows the
ring-back tone from the 49920 ISM connected at pin 34 applies
to the transmit line. The ring-back tone also cycles by the in-
terrupt signal.
♦A 90 second timer starts.
The 90-second timer resets the module and transmits an on-
hook tone to the transmit circuit (back to the caller) if the
phone is not answered. The on-hook tone appears at pin 40. The
order-wire system does not use this capability.
The Ring Trip Sense Adjust compensates for situations where
system resistance exceeds the maximum loop loss. Do not use an
external ringing generator with the -00 option.
When an off-hook condition occurs during the ringing cycle, the
44022 detects the loop current, releases relay K1 and the front
panel OFF HOOK LED lights up.
The 44022 generates an off-hook tone enable which applies an off-
hook tone burst (100 milliseconds) to the transmit circuit (back to
the caller). The off-hook tone does not transmit in the order-wire
application.
The 44022 removes the ring-back and busy tone enables which:
♦Turns off their respective FETs.
♦Disables the 90 second timer.
♦Grounds the M lead at pin 21.
♦Establishes voice communication by flowing off-hook loop cur-
rent.
Clear Circuit
The clear function occurs when:
♦The phone hangs up.
♦90 seconds elapse during off-hook.
♦The call terminates before the phone answers.
When the phone hangs up, a pulse at the reset output (pin 3)
resets the 44020 DTMF Decoder Module and returns the circuit to
its normal condition.
Terminate a call before the phone answers by applying a ground to
the clear input (pin 16). Application of ground returns all functions
to normal and outputs a reset pulse at pin 3. The tone decoder
normally applies the clear input upon receipt of an on-hook tone.
CIRCUIT DESCRIPTION

PAGE 8 44022-00-0898<90-00023>
You can use the front panel TEST/RST switch for card alignment.
Pressing the button once causes an off-hook condition. Pressing
the button again resets the 44022.
POWER REGULATOR SECTION
The power regulator provides -8 VDC, -10 VDC and -20 VDC to the
44022 from a -21 to -56 VDC battery supply. A separate -20 VDC
output powers the relay coil K1 which eliminates the need for a
voltage strap to the relay coil.
CIRCUIT DESCRIPTION
APPLICATION INFORMATION
The 44022 Subscriber Line Interface Module provides tele phone interface and signaling/control for:
♦The 00330 DTSS3A Selective Signaling Order-Wire Terminal
♦The 44028 Common Order-Wire Module
Fig. 3 shows a DTSS3A application.
FEATURES
The 44022-00 module offers features which can be made opera-
tional when the module is installed. Some features are selected
by making wiring connections at the edge connector, while
others are selected using mini-jumper strap options on the
module itself. Refer to the Installation section.
Monitor Speaker
The monitor output at pin 37 drives a speaker amplifier to
monitor system activity. This output monitors all signals at the
line side input. It is not affected by grounding the monitor
control input at pin 27. Open the control input circuit to mute.
External Busy
By providing a ground output, the external busy light output at
pin 19 can drive a lamp or other indicator to show that the
system is busy. The maximum rating at -56 VDC is 200 mA.
This feature is not normally available when the 44022-00 is used
in the order wire system.

44022-00-0898<90-00023> PAGE 9
APPLICATION INFORMATION
Buzzer and Lamp Leads
These outputs are provided for operating the buzzer at pin 29
and lamp at pin 12 on the station phone. The lamp lead pulses
with the ringing cycle and comes on steadily with off-hook
conditions. The buzzer lead pulses with ringing. Outputs switch
to negative battery through open collector transistors. The
maximum current rating of the lamp lead is 50 mA, with 200 mA
available at the buzzer lead.
Manual Off-Hook
A ground at pin 6 will activate all module off-hook functions.
This input is used for special applications.
E and M Leads
The E and M leads are located at pins 1 and 21, respectively.
Where a full-duplex radio is used for the communications
system, the M lead operates the radios CD (Carrier Detect)
output.
All Call and Group Call
The all call input at pin 28 and group call input at pin 26 are
connected to the 44020 Address Decoder through the backplane
wiring. These functions are implemented by programming the
address decoder and by strapping.
STRAPS
All Call and Group Call
The All Call and Group Call inputs can be optioned to defeat the
ringback tone and the automatic time-out feature. Install the
strap to enable these features. Remove the strap to disable these
features.
Line Receive and Transmit Pads
It is recommended that the Receive Pad be strapped in unless
the levels specified in Table B of the Installation section
cannot be attained. Both pads attenuate the signal be 10 dB. A
mini-jumper must be installed in either the IN or the OUT
position.

PAGE 10 44022-00-0898<90-00023>
APPLICATION INFORMATION
Remote M Lead Control Strap
This strap can be installed to allow the M lead to be operated
when a call is received. This function is necessary in two differ-
ent applications:
♦For full-duplex radios, this will key the return link transmit-
ter so that the caller will hear the ringback tone.
♦Where supervisory tones are not used, such as open-line sys-
tems without privacy, this enables M lead control.
Privacy Strap
The privacy feature may be defeated by strapping when an open-
line conference system is selected. With the strap in the PRI-
VACY OUT position, the busy function and manual privacy are
disabled. This is the proper strap position for use in the order
wire system.
Two-Wire/Four-Wire Phone Strap
Two straps are provided for this option. Both mini-jumpers must
be installed for the module to function. Install the jumpers
horizontally for four-wire phones. Install both jumpers vertically
for two-wire phones. Four-wire is recommended if the system is
to be used for conferencing or for all call functions between more
than five phones.
Sidetone Strap
Because a two-wire phone provides its own sidetone through the
hybrid, the sidetone strap must be in the OUT position when a
two-wire phone is used. With the four-wire phone, an external
path must be provided to have sidetone. The sidetone strap is IN
for four-wire phones, unless no sidetone is desired.
Four-Wire Drop Receive Impedence Strap
This strap is placed in the 600 ohm position when a telephone is
connected to the drop. In special applications where the drop
receive (output) port connects to a low impedence device or an
amplifier input, the strap should be in the 0 ohm position.
Ring Generator
This strap is left in the OUT position in the order wire applica-
tion.

44022-00-0898<90-00023> PAGE 11
APPLICATION INFORMATION
FIG. 3 - DTSS3A SELECTIVE SIGNALING ORDER WIRE APPLICATION BLOCK DIAGRAM
P1
Audio
Visual
Ext Spkr. Control
K1
K1
K1
Ext.
Auto.
1 2 3 4
A B C D
13
1 2 4 6 3 9
20
12
Buzz
Interrupt
2 on / 4 off
Ring Back
Tone
49920
Common Interrupt
Supply Module
J1
13 11 14 17 19
27 12
37 21
Buzzer
4W Xmt
4W Rcv
RGBK Tone
Interrupt
29
41
47 2
4 34
30
51 53
7
13 42 10 Bridging
All
Call
Gp Call
Pwr-up
Clear
Gnd
Talk
Batt.
-V
R.G In
31 35 25 17 23 39 26 3 28
Reset
Out
10 5 78
Port of Common Interrupt Supply
Headset
Jack
Phone
Jack
P3-2
P3-1
Busy
Rst In
49018
or
49028
4
12
3
14
Reset In
Ring Start
Pwr-up Clear
Gnd
-V
35 17 39 13 15 8 7
44020 DTMF
Decoder
Module
J3
Gnd
( - )
J6
J1-18 J1-18
Power
-22 to
-56 VDC
D1
J5
55
49
Ring Enable
Sta 1 Out
Pwr-up Busy
Sta 2 Out
-16 dBm
+7 dBm
12
5External Speaker
Lamp (50 mA max)
P1
44022
Station
Interface
J2
Bypass
Bridge Bypass
Bridge
A B
C D
S1
In
1
Out
In 4Out
In
3
Out
Out 2In
Direct
Output
Port
Input
Port
Output
Port
Auxiliary
Port
Input Port Termination
P1
14
Xmt
15
16
17
Rcv
+7
-16
P2
10
Xmt
9
8
7
Rcv
+7
-16
P2
2
Xmt
1
3
4
Rcv
+7
-16
P2
12
Xmt
11
5
6
Rcv
+7
-16
Resistive
Bridge
T
R
T1
R1
T
R
T1
R1
T
R
T1
R1
T
R
T1
R1
S2 Aux Port
Termination
Out
In
In
S3
Input
Port
Termination
In In
In
Out
J7
P1
8
7
10 11
8 9
2W/4W XMT
RCV DROP

PAGE 12 44022-00-0898<90-00023>
INSTALLATION
I
nstallation consists of setting the straps, wiring the connector,
mounting the module in the shelf and checking out the mod-
ule.
1. Install the proper strap options.
Refer to Table A and Fig. 4.
TABLE A- 44022 SUBSCRIBER LINE INTERFACE MODULE STRAP OPTIONS
STRAP
ALL CALL AND GROUP CALL RINGBACK TONE
Group Call
All Call
LINE RECEIVE; 4-WIRE RCV LEVEL
-3 dBm to +7 dBm
-16 dBm to -3 dBm
LINE TRANSMIT; 4-WIRE XMT LEVEL
-3 dBm to +7 dBm
-16 dBm to -3 dBm
REMOTE M LEAD CONTROL
By incoming call (with radios)
By subscriber off-hook
PRIVACY
Automatic or Manual Privacy
No Privacy (normal for order wire applications)
2-WIRE/4-WIRE (DROP)
2-Wire
4-Wire
SIDETONE
4-Wire; with sidetone
4-Wire; without sidetone
2-Wire; all applications
4-WIRE DROP RCV IMPEDANCE
600 ohms
0 ohms
Ring Generator
OPTION
GP
ALL
RCV PAD IN
RCV PAD OUT
XMT PAD OUT
XMT PAD IN
IN
OUT
PRIVACY IN
PRIVACY OUT
2W (Straps vertical)
4W (Straps horizontal)
SIDETONE IN
SIDETONE OUT
SIDETONE OUT
600 OHMS (Straps horizontal)
0 OHMS (Straps vertical)
OUT (always)

44022-00-0898<90-00023> PAGE 13
FIG. 4 - 44022 SUBSCRIBER LINE INTERFACE MODULE STRAP OPTION LOCATIONS
2. Wire the connector.
If you wire the connector, refer to Fig. 5 for the module connec-
tor pin wiring assignments.
3. Mount the module in the equipment shelf.
Slide the module along the guide slots then firmly seat the edge
connector in its receptacle.
4. Check out the module.
Refer to Table B for checkout procedures.
Use the following test equipment for module checkout:
♦Level Meter (Weston Model 666, Hewlett-Packard 440EL or
similar equipment, or you can use a Dantel 8002 Test Set)
♦Test oscillator (Dantel 8002 Test Set or any 600 ohm audio
oscillator)
NOTE:
You only need a test oscillator
when you test the 44022 SLIM in
an assembly that does not have a
44011 Line Interface Module.
You can normally use the test os-
cillator built into the 44011 Line
Interface Module.
INSTALLATION
CONTINUED . . .
UPDATED
XMT
DISTRIBUTION
OUTPUT TP
XMT DROP
2W/4W
TEST JACKS
RCV
DISTRIBUTION
OUTPUT TP
RCV LEVEL
ADJUST
SIDE TONE
OUT IN
IN OUT
10dB XMT
PRIVACY
REMOTE
M LEAD
OUT
IN
OUT
IN
OUT
IN
ALL
GRP
RCV PAD
OUT
IN
RG
600 OHM
600 OHM
0 OHM
0 OHM
4W
4W
2W2W
R51
R4
RING TRIP
SENSE ADJUST
R38
44022-00
STATION
INTERFACE
XMT
LINE TP
GND
LINE
DROP MON
TRANSMIT
DIST
GND
LINE
DROP MON
RECEIVE
DIST
RCV
LINE TP
RCV DROP
4W
TEST JACKS
STATUS LED
INDICATORS
XMT LEVEL
ADJUST
TEST/RESET
SWITCH
Busy
Inc. Call
Off Hook
B11-44022-00 REV__
TEST RST

PAGE 14 44022-00-0898<90-00023>
FIG. 5 - 44022 SUBSCRIBER LINE INTERFACE PIN DESIGNATIONS
INSTALLATION
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, Drop or 2W R
4W XMT, Drop or 2W T
4W XMT, Line R
4W XMT, Line TDistribution Output
Power-Up ClearOn-Hook Tone Input
Speaker Monitor OutOff-Hook Tone Input
-BatteryBusy Tone Input
Forced DisconnectRingback Tone Input
Ring Generator Input (use with -10 only)Alert Tone Input
Buzzer OutputInterrupt
Monitor Control (Mute)All Call
Talk Battery (-)Group Call
Ring Generator Input (Ground)Local Station
M LeadBusy
External Busy Light
Ground
Clear
4W RCV, DropManual Clear Input
Summing InputCall Light
Summing InputSumming Input
4W RCV, DropSumming Input
Manual Off-Hook
Reset Out4W RCV, Line
E Lead4W RCV, Line

44022-00-0898<90-00023> PAGE 15
The check-out procedure does not provide for testing the monitor
output, buzzer lead, lamp lead, or busy-circuit light output. Any
of these outputs used must be tested by connecting them to their
appropriate devices and observing their operation. The all-call
and group-call functions are tested as part of the system test
procedure.
TABLE B - 44022-00 SUBSCRIBER LINE INTERFACE MODULE CHECK-OUT PROCEDURE
ACTION
Remove power from the shelf.
Plug in the 44022-00 module.
Apply power.
Insert a test tone or test oscillator at the 4W RCV
input (pins 2 and 4) or at the LINE RECEIVE test
points. Insert a level meter (unterminated) at the
LINE RECEIVE test points.
Note: Any source device that loads down the input
must be disconnected.
For 2-wire phones:
Move the level meter (600 ohm termination) to
the DROP TRANSMIT jack. The phone will be
disconnected when the plug is inserted.
For 4-wire phones:
Connect the level meter (600 ohm termination) to
the DROP RECEIVE jack.
When finished setting levels, press the TEST/RST
button. The OFF HOOK LED goes off.
Remove the meter and test oscillator connections.
Insert the test oscillator at the DROP TRANSMIT
jack.
Note: If the LED does not light, the oscillator is not
providing a resistive path to ground. Place a 600
ohm load across the oscillator output.
Connect an unterminated level meter across the
oscillator terminals.
Connect the level meter (terminated) to the LINE
TRANSMIT test points.
Note: Any source device that loads down the input
must be disconnected.
Disconnect the meter and test oscillator.
RESULTS
No LEDs should light. If the
BUSY LED is on, press the
TEST/RST button twice.
Set the frequency to
approximately 1 KHz. Set
the level to system test-tone
level (0 dBm).
OFF-HOOK LED comes on.
Read -4 dBm. Adjust the
RECEIVE level control as
required. Strap out the in-
put pad if level cannot be
attained.
Read -13 dBm. Adjust the
RECEIVE level control as
required. Strap out the in-
put pad as necessary.
OFF-HOOK LED lights.
Set the level to 0 dBm
Read system test-tone level
(0 dBm). Adjust TRANSMIT
level control as required.
Strap the output pad IN or
OUT as required to attain
the desired level.
STEP
1
2
3
4
5
6
7
NOTE:
When the 44022 is installed in a
DTSS3A System, the common
modules 49920, 44020, and 44028
or 49018 must be checked out be-
fore checking out the 44022.
INSTALLATION

PAGE 16 44022-00-0898<90-00023>
OPERATION
The 44022 Subscriber Line Interface Module operates when you apply power. Operation of the consists of observing the
front panel LEDs:
♦The BUSY LED indicates the system is busy.
♦The INC CALL LED indicates an incoming call. The LED
pulsates with the ringing signal.
♦The OFF HOOK LED lights up when the subscriber phone is
off hook.
The front panel TEST/RST switch tests and aligns the 44022
SLIM. Clear the off-hook condition by pressing the TEST/RST
switch. The OFF HOOK LED goes dark.

44022-00-0898<90-00023> PAGE 17
TECHNICAL SPECIFICATIONS
DESCRIPTION
Frequency Response
Return Loss (Line and Drop)
Maximum Loop Loss
Signal Levels
Line Receive
Line Transmit
Summing Inputs
Distribution Output
Drop Receive (4-Wire)
Drop Transmit (2- or 4-Wire)
Drop Receive (2-Wire)
E Lead
M Lead
Tone Input Levels (Composite)
Busy
Off-Hook (#)
On-Hook (*)
Ringback
Alert
Clear Inputs (Clear, Manual Clear,
Power-Up Clear)
Call Inputs (Station Call, Group
Call, All Call)
Busy Input
Interrupt Input
Forced Disconnect Input
Manual Off-Hook
Monitor Control
Reset Output
External Busy Light Output
Lamp Lead
Buzzer Lead Outputs
Input Voltage Range
Input Power Requirements
Idle
Full Load
Heat Dissipation
Idle
Full Load
Physical Dimensions
Weight
Operating Temperature Range
VALUE
300 Hz to 3400 Hz + 0.5 dB
>20 dB
250 ohms @ -24 VDC, nominal
1000 ohms @ -48 VDC, nominal
-16 to +7 dBm
-16 to +7 dBm
-10 dBm
-10 dBm
-13 dBm, nominal
0 dBm, nominal
-4 dBm, nominal
Ground to operate. -56 VDC maximum input.
Normally open (on-hook)
Operated ground (off-hook)
-56 VDC @ 50mA max. source
-13 dBm
-13 dBm
-13 dBm
-16 dBm
-13 dBm
Ground to clear. Manual clear diode protected to -56VDC.
Ground to call.
Ground to busy.
Ground to ring. Open to interrupt.
Ground to disconnect. Diode protected to -56 VDC.
Ground for off-hook.
Ground to mute monitor output.
Diode protected to -56 VDC.
Pulse to ground. Open Emitter. -30 VDC @ 200mA
max. source.
Ground when busy. -56 VDC @ 50mA max. source.
Open collector to input battery supply; 50mA max.
-56 VDC @ 200mA max.
-21 VDC to -56 VDC
25mA
120mA
4.8 BTU/Hr.
23 BTU/Hr
1.4" x 6.0" x 5.6"
9 oz.
0° to 60° C.

PAGE 18
18 PAGES 44022-00-0898<90-00023>
LIMITED WARRANTY
The Seller warrants that the standard hardware products sold will be free from defects in material and
workmanship and perform to the Sellers applicable published specifications for a period of 18 months for
hardware, and 3 months for software, from the date of the original invoice. The liability of the Seller hereunder
shall be limited to replacing or repairing, at its option, any defective products which are returned F.O.B. to the
Sellers plant, (or, at the Sellers option, refunding the purchase price of such products). In no case are products
to be returned without first obtaining permission and a customer return authorization number from the Seller.
In no event shall the Seller be liable for any consequential or incidental damages.
Equipment or parts which have been subject to abuse, misuse, accident, alteration, neglect, unauthorized
repair or installation are not covered by warranty. The Seller shall make the final determination as to the
existence and cause of any alleged defect. No warranty is made with respect to custom equipment or products
produced to the Buyers specifications except as specifically stated in writing by the Seller in the contract for
such custom equipment.
This warranty is the only warranty made by the Seller with respect to the goods delivered hereunder, and may
be modified or amended only by a written instrument signed by a duly authorized officer of the Seller and
accepted by the Buyer.
Warranty and remedies on products not manufactured by the Seller are in accordance with warranty of the
respective manufacturer. THE SELLER MAKES NO OTHER WARRANTY OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED; AND ALL IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PUR-
POSE WHICH EXCEEDS THE AFORESAID OBLIGATIONS IS HEREBY DISCLAIMED BY THE SELLER.
INCASE OF DIFFICULTY
If you experience difficulty with this equipment, check the following, as appropriate:
1. Switch settings
2. Signal levels
3. Software configuration
4. Connections between Dantel’s equipment and your equipment.
If there is still a problem, substitute equipment that is known to be good. For additional assistance, call
Dantels Technical Field Service Department weekdays, 6 A.M. to 5 P.M. pacific time:
1-800-4DANTEL (1-800-432-6835).
If a thorough checkout shows a piece of equipment has malfunctioned, you may return it to the factory. For
repairs and emergency replacements, obtain a Return Material Authorization (RMA) number from the Cus-
tomer Service Representative at 1-800-4DANTEL (1-800-432-6835).
To ensure expedient processing of your order, provide a purchase order number and shipping and billing
information when requesting an RMA number. Also, when the units are returned to Dantel, include a descrip-
tion of the failure symptoms for each unit returned. Send defective equipment to:
Dantel, Inc. • 2991 North Argyle Avenue • Fresno, California 93727-1388
P.O. Box 55013 • Fresno, CA 93747-5013 Phone [phone] Fax [phone] http://www.dantel.com
WARRANTY