Toshiba Strata DK14 Manual

726+,%$ Telecommunication Systems Division
May 1999
Digital Business Telephone Solutions
Installation and Maintenance
Manual
Software Release 4.1
and ACD
Software Release 3.1
Software Release 4.1

Strata DK I&M 5/99 3-1
DK40i Installation
DK40i Installation 3
This chapter explains how to install the Strata DK40i system. It includes information on site
requirements, wiring diagrams, and step-by-step instructions on how to install the unit(s), the
ground wiring, AC power cabling, reserve power (battery backup) cabling, and PCB cabling.
Inspection
1. When the system is received, examine all packages carefully and note any visible damage. If
any damage is found, do not open the packages. Contact the delivery carrier immediately and
make the proper claims.
2. After unpacking (and before installing), check the system against the packing list and inspect
all equipment for damage. If equipment is missing or damaged, contact your supplier
immediately.
3. Be sure to retain original packaging materials for re-use when storing or transporting system
hardware.
Packaging and Storage
CAUTION! When handling (installing, removing, examining) PCBs, do not touch the back
(soldered) side or edge connector. Always hold the PCB by its edges.
➤When packaging and storing the system, remove PCBs from the system cabinet (the power
supply may remain installed in the cabinet for storage and shipment). PCBs should be
packaged in their original antistatic bags for protection against electrostatic discharge. Be sure
to package equipment in its original shipping containers.
Site Requirements
This section defines the installation site requirements necessary to ensure a proper operating
environment for the DK40i. Also included are grounding requirements.

DK40i Installation
Site Requirements
3-2 Strata DK I&M 5/99
Input Power
The system requires an input power source of 115VAC ± 10VAC, 50/60 Hz, 15 amps. The AC
outlet is recommended to be dedicated and unswitched, with a solid third-wire ground. (See “AC
Power and Grounding Requirements” on Page 3-4.)
This eliminates interference from branch circuit motor noise or the like, and to prevent accidental
power-off. To avoid accidental power turn-off, Toshiba recommends that you do not use an ON/
OFF wall switch on this dedicated AC circuit.
For the Strata DK40i, a reserve power source (two customer-supplied 12-volt batteries) may be
connected to the system to serve as a power failure backup.
Clearance and Location
The minimum clearance requirements for the Strata DK40i Base and Expansion KSUs are shown
in Figures 3-1 and 3-2. Refer to Page 3-5 for DK40i KSU mounting instructions.
Consider the following conditions when selecting a location for the KSU(s):
The location must be:
Dry and clean
Well ventilated
Well illuminated
Easily accessible
2" 2" 2"
2"
18"
Front View
12.25"
Top View
3.5"
3 Feet
Wall
DK40i
Base KSU
4234
Figure 3-1 DK40i Base KSU Clearance
Requirements
2"
2"
18"
Front View
20"
Top View
3.5"
3 Feet
Wall
2"
DK40i
Base KSU
Expansion
Unit
BaseExpansion
2"
4235
Figure 3-2 DK40i Base KSU and Expansion
KSU Clearance Requirements

DK40i Installation
Site Requirements
Strata DK I&M 5/99 3-3
DK40i Installation
The location must not be:
Subject to extreme heat or cold
Subject to corrosive fumes, dust, or other airborne contaminants
Subject to excessive vibration
Next to television, radio, office automation, or high frequency equipment
If reserve power is to be installed for the Strata DK40i, the batteries will require a well-ventilated
location close (within nine feet) to the DKSUB40 (the optional Toshiba-supplied battery cable is
nine feet in length).
Table 3-1 provides a summary of the electrical and environmental characteristics
Table 3-1 Summary of Electrical/Environmental Characteristics
DK40i Primary Power
Input AC (Power Supply Specification)
AC frequency
Power
AC input current
85~135VAC
50/60 Hz
DK40i - 75 watts maximum
1.8A maximum
Environmental Specifications
Operating temperature
Operating humidity
Storage temperature
32~104° F (0 ~40° C)
20~80% relative humidity without condensation
-4~158° F (-20~70° C)
Power Supply
DC voltage output specification
-24VDC (-25.94~-28.66VDC)
+5VDC (+4.5~+5.5VDC)
-5VDC (-4.5~-5.5VDC) - Expansion KSU only
Battery Charger Characteristics
Charger: current limiting
Nominal float voltage: 2.275 volts/cell
Charge current: 0.7 amps maximum
Battery discharge cut-off voltage: 20.5 ±0.5VDC
KSTU2, PSTU or PESU (Circuits 1 and 2)
Ring Voltage
Square wave output with high/low option jumper:
Low position 130 ±20VDC peak-to-peak (no-load)
High position, 190 ±25VDC peak-to-peak (no-load)
Ringing capability 2 REN maximum per circuit, high or low position
KSTU2, PSTU, or PESU modem interface
data rate 14,400 bps maximum
RSTU, RSTU2 or RDSU
Ring Voltage 80V RMS sine wave
Ringing capability 1.5 REN per circuit, with or without Message Waiting
RSTU2 Message Waiting Voltage -90VDC/one telephone per circuit (max.)
RSTU, RSTU2, or RDSU modem interface
data rate 14,400 bps maximum
Traffic Rating Characteristics
9 CCS per station system-wide

DK40i Installation
AC Power and Grounding Requirements
3-4 Strata DK I&M 5/99
AC Power and Grounding Requirements
The DK40i requires a solid earth ground for proper operation.
The AC power cord contains a conductor
for the “third-wire ground” provided by
the commercial power outlet. The third-
wire ground should be the only ground
necessary for the DK40i; this ground
must originate at the buildings main
power distribution panel and have a solid
connection to earth ground. (See Figure
3-3.)
CAUTION! Lack of proper ground
may cause improper
operation and, in extreme
cases, system failure.
AC Power and Third-wire Ground
Test
Test the “third-wire ground” for continuity by either measuring the resistance between the third
prong terminal (earth ground) and a metal cold water pipe (maximum: 1 ohm), or by using a
commercially available earth ground indicator. If neither procedure is possible, perform the
following earth ground test procedure.
➤To perform the earth ground test procedure
1. Obtain a suitable voltmeter, and set it for a possible reading of up to 250VAC.
2. Connect the meter probes between the two main AC voltage terminals (white and black wires)
on the wall outlet. The reading obtained should be between 100~125VAC.
3. Move one of the meter probes to the third terminal (green wire ground). Either the same
reading or a reading of zero volts should be obtained.
4. If the reading is zero volts, leave one probe on the ground terminal and move the other probe
to the second voltage terminal.
CAUTION! If a reading of zero volts is obtained on both voltage terminals (white wire to
green wire, black wire to green wire), the outlet is not properly grounded. Omit
Steps 5 and 6, and see following CAUTION!
5. If a reading of zero volts on one terminal, and a reading of 100~125VAC on the other terminal
is obtained, remove both probes from the outlet.
WARNING! Hazardous voltages that may cause death or injury are exposed during
the following test. Use great care when working with AC power line
voltage.
Figure 3-3 DK40i Grounding Diagram
Power
Supply
FG
Third Wire
AC Ground
Ground 1 Third Wire Ground
To AC Power Cord
DK40i BaseKSU
A
Electrical Building
Ground (Main Power
Distribution Box)
Alternate Ground
Grounding Rod
AC Voltage
115VAC
± 10VAC
AC Current
1.8 amps max.
4236
4' 5"

DK40i Installation
KSU Mounting Considerations
Strata DK I&M 5/99 3-5
DK40i Installation
6. Set the meter to the “OHMS/Rx1” scale. Place one probe on the ground terminal, and the other
probe on the terminal that produced a reading of zero volts. The reading should be less than 1
ohm.
CAUTION! If the reading is more than one ohm, then the outlet is not adequately grounded.
If the above tests show the outlet AC voltage is not in range or is not properly
grounded, the condition should be corrected (per Article 250 of the National
Electrical Code) by a qualified electrician before the system is connected.
Alternate or Additional Ground
If the “third-wire” AC ground can not practically be improved or if extreme motor noise or other
disturbance causes system malfunction, or if local area lightning storms exist, a separate direct
ground may be warranted.
Connect a separate earth ground from a cold water pipe or earth grounding rod directly to the FG
screw terminal on the DK40i power supply (see Figure 3-3).
KSU Mounting Considerations
The Base KSU and the optional Expansion KSU are both designed to be mounted on a wall or
other vertical surface. Toshiba recommends using method 1 or 2 (see Figure 3-4).
Prior to Installation
1. Loosen the screws on the front cover and the side cover of the Base KSU, remove the covers
(see Figure 3-5). Figure 3-6 on Page 3-11 details the interior.
2. Place the BATT jumper plug to the ON position.
3. Install a CO line board, either the TDDU or TCOU onto the TMAU board (see Figure 3-7).
The TCOU provides four loop start CO lines and can accommodate the Caller ID interface
unit.
The TDDU provides four DID lines.
4. Set CO line card switches.
TCOU: Set the TCOU PAD switches (SW400-SW475) to the appropriate position (see Figure
3-21 on Page 3-32). The factory setting is NORMAL. If CO lines are connected to a PBX or
are in close proximity to the central office the PAD position may be required.
TDDU: Set the TDDU PAD switches to the appropriate position. Also, set the high/low
voltage jumper plugs as required for proper dial pulse operation. See Figure 3-22 on Page 3-
35.
5. If you are not installing a TCIU2, skip to Step 6. To install the TCIU2 (see Figure 3-20 on
Page 3-29), align the prongs P20, P21, and P22 over P120, P121, and P122 of the TCOU and
gently press down. Slip the plastic stand-off hook through the hole.
CAUTION! To prevent system malfunction, DO NOT install TCIU1 in the DK40i system.

DK40i Installation
KSU Mounting Considerations
3-6 Strata DK I&M 5/99
6. The TCOU or TDDU cards have a green and yellow wire with a two-prong spade on the end.
Slip the spade under the second screw from the right on the power supply (see Figure 3-7).
7. If applicable, install KSTU2 Standard Telephone Interface Unit. The KSTS2 comes pre-
installed onto the KSTU2. Then install both boards into the DK40i Base KSU (see Figures
3-17~3-19, beginning on Page 3-26).
8. If applicable, install the K5RCU or K5RCU2 or K4RCU3 (which provides Automatic Busy
Redial and DTMF tone detection) into the Base KSU (see “K4RCU, K5RCU or K5RCU2
Installation” on Page 3-23).
9. If applicable, install the KKYS (which provides built-in Auto Attendant) onto the K5RCU or
K5RCU2 or K4RCU3.
10. If applicable, install the TSIU Serial Interface PCB into the KSU (Figure 3-23 on Page 3-37).
If the TSIU is used for SMDR or TTY, then the PIOU/PIOUS SMDR/TTY output is not
active.
Testing the System’s Power Supply
If the “AC” or “DC” LEDs fail to light in Steps 1 or 3, see TPSU16 Circuit Breaker Reset
Procedure–Case 1.
1. Plug the AC power cable into an outlet (see Figure 3-8). The “AC” LED on the power supply
lights green.
2. Turn ON the DC power switch for the TPSU16 power supply (see Figure 3-6). The “DC” LED
on the power supply lights green.
3. Using a voltmeter or other device which checks voltage, measure the voltages referenced to
frame ground (FG) at the P16 connector pins (test points) located on the motherboard. The
voltages should fall within the ranges below.
Yellow-green, black, and green wires: 0V
Two yellow wires: -27V
Range: -25.94V~-28.66V
If the voltages do not fall within the ranges, unplug the DC power pins from the P16 connector
and measure again at the same location; if the ranges remain unacceptable. See TPSU16
Circuit Breaker Reset Procedure–Case 2.

DK40i Installation
KSU Mounting Considerations
Strata DK I&M 5/99 3-7
DK40i Installation
TPSU16 Circuit Breaker Reset Procedure
Case 1
If the AC and DC LEDs on the TPSU16 power supply in the Strata DK40i Base KSU do not light,
even though the AC power plug is inserted into the wall outlet and the TPSU16 DC power switch
is turned on, the AC overvoltage circuit breaker may have opened.
➤To reset the AC overvoltage circuit breaker
1. Remove the AC power plug from the wall outlet, turn the DC power switch OFF, and wait six
minutes.
2. After six minutes, insert the AC plug back into the wall outlet and turn the DC power switch
ON. The AC and DC LEDs should turn on and the system should operate.
If the system fails to operate, either the wall outlet is not providing AC power or the system’s
power supply is defective.
3. If the AC power checks good, replace the power supply (see “Power Supply Removal and
Replacement” on Page 3-19).
Case 2
If the TPSU16 power supply AC and DC LEDs light, but the system does not operate, the TPSU16
DC output overcurrent circuit breaker may have opened because of a DC short circuit.
➤To reset the DC output overcurrent circuit breaker
1. Turn the DC power switch OFF for 15 seconds and then turn it back on. The system will go
back to normal operation if the overcurrent breaker resets.
2. If the system continues to fail, press in the two -24VDC circuit breakers located on the bottom
left corner of the TPSU16 power supply.
If, then, the system does not return to normal operation, the TPSU16 power supply may be
defective or an optional PCB may be shorting out the TPSU16.
3. Remove all optional PCBs and the Expansion KSU to locate the short, then repeat Steps 1 and
2 and perform the power supply test.
4. If the power supply fails the test, replace the power supply (see “Power Supply Removal and
Replacement” on Page 3-19 for more information.). If the power supply passes the test, the
DK40i Base KSU is probably defective.

DK40i Installation
KSU Mounting Considerations
3-8 Strata DK I&M 5/99
Mounting the Base KSU
➤To mount the Base KSU
1. Place the Base KSU on the desired location on the mounting surface and mark the location of
the four screw holes (there is one on each corner). See Figure 3-6.
Make sure the location of the Base KSU meets the minimum clearance requirements specified
in Figure 3-1 on Page 3-2.
Note The Base KSU AC power cord is 4 feet 5 inches long.
2. Drill holes on these marks.
If mounting the KSU directly to a wall, align screws with studs behind the wall. If using a hard
board between the KSU and the wall, install screws first to the hard board, and then secure the
hard board to the wall, making certain that screws are aligned with studs.
3. Secure screws approximately two thirds of the way into the top two holes on the mounting
surface.
4. Hang the unit from the top two screws and then secure the screws completely into the
mounting surface.
5. Finish securing the unit to the mounting surface by completely screwing the bottom two
screws into the wall.
6. Ground system according to “AC Power and Grounding Requirements” on Page 3-4.
7. Connect applicable wiring (e.g., modular CO line cords, 25-pair amphenol connector cable–
see Figure 3-25 on Page 3-41) to the Base KSU and then fasten wiring to the unit with the tie
wrap that comes with the Base KSU (see Figure 3-8 on Page 3-13). Remove amphenol
connector clamp from plastic bag that comes with the Base KSU. Fasten the clamp to hold the
amphenol connector.
8. Connect Reserve batteries and plug battery cable into BATT connector of the KPSU16 power
supply (see “Reserve Power Option” on Page 3-17).
9. If the Expansion KSU is going to be installed, refer to “Mounting the Expansion KSU” on
Page 3-9. If not, proceed to Step 1.
10. Plug the AC power cable into an outlet and then turn ON the power supply switch.
11. Reinstall the front and side covers onto the Base KSU.
WARNING! To prevent electrical shock, make sure the power supply switch is turned OFF.

DK40i Installation
KSU Mounting Considerations
Strata DK I&M 5/99 3-9
DK40i Installation
Mounting the Expansion KSU
Important! For purposes of identification, the labels appear on the boxes and Expansion KSUs
(see Table 3-2).
Table 3-2 Expansion Unit Labels
➤To mount the Expansion KSU (see Figures 3-4, 3-6, 3-8~3-11)
1. Make sure the side cover is removed from the Base KSU. Turn Base KSU DC power switch
OFF.
2. Set the Expansion KSU on the Base KSU’s hinge mounts, making sure that the Expansion
KSU sets properly in place.
3. Remove the safety lock from plastic bag that comes with the Expansion KSU. Install safety
lock to the Base KSU as shown.
4. Pull out on the safety lock until it can no longer be moved, securing the Expansion KSU to the
Base KSU. Do not detach the lock from the Base KSU.
5. Connect the Expansion KSU ribbon cable to the connector on the Base KSU. Close ribbon
cable connector lock on Base KSU.
6. Connect Expansion KSU green/yellow ground wire plug (FG2) to TB1 of the Base KSU.
(Make sure the plug locks on FG2.)
7. Making sure that the Expansion KSU is flush against the mounting surface, mark the location
of the Expansion KSU mounting screw hole.
8. Swing the Expansion KSU away from the mounting surface, and drill a hole at the mark made
in Step 7.
9. Install the PCBs per “Worksheet 1 – System PCB Assignment Guide” on Page 2-11 and slide
the slot lock to the lock position.
10. Swing the Expansion KSU back to the mounting surface and secure it to the surface with a
screw.
11. Connect the wiring (e.g., modular CO line cords, 25-pair amphenol connector–per Chapter 8 –
DK40i/DK424 Universal Slot PCB Wiring) to the PCBs.
12. Fasten the wiring with Tie wraps (supplied) to the bottom of the expansion and Base KSUs.
13. Knock out the tab on the bottom of the side cover.
14. Plug the AC power cable into an outlet and then turn ON the power supply switch.
15. Install the side cover to the Expansion KSU.
DK40i DK40 DK16e DK16
Expansion Unit Box Labels DKSUBI40A DKSUB40A DKSUBT16A DKSUB16A
Expansion KSU Model No.
(expansion case bottom)
Model DKSUE40A1
Strata DK40
1. Strata DK40 may appear on a label.
Model DKSUE40A
Strata DK40
Model DKSUET16A
Strata DK16e
Model DKSUE16
Strata DK16
WARNING! To prevent electrical shock, make sure the power supply switch is turned
OFF.

DK40i Installation
KSU Mounting Considerations
3-10 Strata DK I&M 5/99
Method 1 Method 2
Stud
Plaster Board
Stud
Plaster
Board
Hard Board
(1/2 Inch Plywood)
Expansion
KSU
Base KSU Base KSU
Expansion
KSU
1614
Figure 3-4 KSU Wall Mounting
Base Cover
Side Cover
AC DC
POWER
Cover
Screws (6)
=
4237
Six cover screws
to be removed
before mounting
KSU
Model: DKSUBI40A
Strata DK40i
Label on edge of
Base KSU
Figure 3-5 Base KSU Exterior

DK40i Installation
KSU Mounting Considerations
Strata DK I&M 5/99 3-11
DK40i Installation
Figure 3-6 DK40i Base KSU Interior
FG2
POWER SUPPLY ASSEMBLY
MODEL
INPUT: AC127V 2.2A 60 HZ
OUTPUT: -27.3V 2.8A. -27.3V 0.2A
V. 1A 1996-05 00001
TOSHIBA CORPORATION
TPSU16A
MADE IN
WARNING
Hazardous voltage inside!
If servicing required
remove A. C. plug.
1 2
+
-
BATT
PN2
1 2
AC DC
DC POWER
TMAU2A
OFF
ON
4238
Connect Expansion
Unit TB1 TO FG2
Expansion KSU
Cable Receptacle
Important Notice
Battery Jumper
-24 Volt Circuit
Breakers
Reserve Power
Battery Jack
Base Telephone
Tip/Ring and
Relay Contact
Music-on-Hold
Input
Music-on-Hold
Sensitivity Adjustment
IMPORTANT: DKSUE16A is incompatible with this unit
DKSUET16A or DKSUE40A is required for expansion

DK40i Installation
KSU Mounting Considerations
3-12 Strata DK I&M 5/99
+-
TCOU1A V1
TC1U2A
Optional with TCOU
(provides Caller ID)
Install a TCOU, TBSU
or TDDU here
FG Screw
TDDU1A V1
3796
TBSU1A
FS
LOS
TS
BSY
FS
LOS
TS
BSY
Figure 3-7 CO Line Board Installation into DK40i Base KSU

DK40i Installation
KSU Mounting Considerations
Strata DK I&M 5/99 3-13
DK40i Installation
Figure 3-8 Base KSU Cables and Connectors
AC DC
POWER
Self-Adhesive
Rubber Pad
Supplied in
plastic bag
with Base KSU.
Modular
Connector
RCA Plug
Amphenol
Connector
Tie Wrap
Holder
Base KSU
PIN Jack
Cord (X2)
Amphenol
Cord (X1)
Modular
Cord (X5)
Tie Wrap
1
Amphenol
Clamp
Supplied in
plastic bag
with Base KSU.
AC Power Cord
Do not route power
cord with other cords.
2161

DK40i Installation
KSU Mounting Considerations
3-14 Strata DK I&M 5/99
Figure 3-9 Base to Expansion KSU Connection
Hinge Mount
PULL
LOCK
PUSH
UNLOCK
Safety Lock
(Supplied with
Expansion KSU)
Ribbon Cable
(from Expansion KSU – Plugs into
Expansion Connector (P3) of Base KSU)
Expansion KSU
Green/Yellow
FG2 Wire and Plug
(From Expansion
KSU – Plugs into
TB1 of Base KSU)
TB1 (FG2)
P3
Ribbon
Connector
Lock
2162
Base KSU

DK40i Installation
KSU Mounting Considerations
Strata DK I&M 5/99 3-15
DK40i Installation
Figure 3-10 Expansion KSU Mounting and Connections
Expansion
Safety Lock
Expansion
KSU Latch
Ribbon Cable
to Expansion KSU
Mounting Hole
and Screw
Base KSU
Expansion
KSU
Tie Wrap Holder
FG Screw
AC Cord (4'4")
4241
FG2 Wire
FG2
POWER SUPPLY ASSEMBLY
MODEL
INPUT: A C127V 2.2A 60 HZ
OUTPUT : -27.3V 2.8A. -27.3V 0.2A
V. 1A 1996 -05 00001
TOSHIBA CORPORATION
TPSU1 6A
MADE IN
WARNING
Hazardous voltage inside!
If servicing required
remove A. C. plug.
1 2
+-
BATT
PN2
1 2
AC DC
DC POWER
TMAU2A
PULL
LOCK
PUSH
UNLOCK
Model DKSUE40A
Label on edge of Expansion KSU

DK40i Installation
KSU Mounting Considerations
3-16 Strata DK I&M 5/99
Figure 3-11 Expansion KSU Slot Lock
The DK16e Expansion Cabinet can be used on the DK40i Base Unit. The DK16e and DK40i
Expansion Cabinet slot labels are different from the Program 03 slot numbers. Table 3-3 provides
the slot labels and Program 03 slot numbers.
Table 3-3 DK16e and DK40i Expansion Cabinet Slot Names
DK40i
Slot Label
DK40i Prg 03
Slot Number
S04 S15
S05 S16
S06 S17
S07 S18
Expansion KSU
Slot Lock
PCB
S06 S07
S04 S05
Lock
Side Cover 4242
Slot label

DK40i Installation
Reserve Power Option
Strata DK I&M 5/99 3-17
DK40i Installation
Reserve Power Option
A reserve power source (two customer supplied 12-volt batteries) can be connected to the DK40i
power supply to ensure uninterrupted system operation in the event of a power failure. A pre-
assembled interface cable for installation of the Reserve Power option is available from Toshiba
(PBTC-3M), see Figure 3-12.
Figure 3-12 System Power Supply Wiring
Important! Local ordinances may dictate battery type and installation details.
The batteries require a well-ventilated location within nine feet of the system (the interface cable is
nine feet long).
WARNING! To reduce the risk of fire or injury to persons, read and follow these instructions:
➤Use only 12-volt, gelcell batteries.
➤Do not dispose of the batteries in a fire. The cells may explode. Check with local
codes for possible special disposal instructions.
➤Do not open or mutilate the batteries. Released electrolyte is corrosive and may
cause damage to the eyes or skin. It may be toxic if swallowed.
➤Exercise care in handling batteries in order not to short the battery with
conduction materials such as rings, bracelets, and keys. The battery or
conductor may overheat and cause burns.
➤Charge the batteries provided with or identified for use with this product only in
accordance with the instructions and limitations specified in this manual.
➤Observe proper polarity orientation between the batteries and battery charger.
Actual Size
PBTC-3M
Battery Cable with
Ring Terminals
and PPSU Connector
(length - 9 feet)
Power Supply
BATT
Two-prong Male
Connector
(pre-assembled)
Black
White
In-line Fuse Holder 10 A
(Fuse Provided)
Black Jumper with
Ring Terminals
(provided)
White
Black
12 VDC
Battery
+
–
12 VDC
Battery
+
TPSU40
+
–
Ring Terminals 3/8 In.
–
16AWG
2164

DK40i Installation
Power Failure Emergency Transfer Option
3-18 Strata DK I&M 5/99
Reserve Power Installation
1. Connect the PBTC-3M black jumper wire from the positive terminal of one 12VDC battery to
the negative terminal of the second 12VDC battery. See Figure 3-12.
2. Ensure that a serviceable 10-ampere fuse is installed in the in-line fuse holder of the PBTC-
3M battery cable.
3. Connect the white lead of the PBTC-3M battery cable to the open positive terminal of the
12VDC battery. Connect the black lead to the open negative terminal of the second 12VDC
battery.
Important! The KSU must be connected to the live operating (hot) AC power source, and the
power supply ON/OFF switch set to ON prior to the final step of connecting the
reserve power batteries to the power supply via the BATT +/- receptacle. If the
batteries are connected after AC power is lost, reserve power will not function.
4. Connect the PBTC-3M battery cable two-prong male plug to the power supply BATT +/-
receptacle.
5. To test reserve power operation, disconnect the system AC power plug with the power supply
power ON/OFF switch in the ON position. The system should continue to operate without any
interruption.
6. Plug the AC power cable into PN2.
7. Plug the AC power cable into an outlet and turn ON the power supply switch.
8. See “Prior to Installation” to confirm that the power supply is working properly.
9. Plug reserve battery cable into BATT connector of power supply.
Power Failure Emergency Transfer Option
To enable this option, a dedicated standard telephone must be connected to the Power Failure
Transfer Interface (PF1) of a DK40i Base KSU equipped with a TCOU.
Note During normal operation, this telephone cannot be used and does not count as a station
(does not reduce the number of system’s available stations).
If there is a power failure, the telephone automatically is connected to CO Line 1. When power is
restored, the system resumes normal station and CO line assignments, and the dedicated telephone
becomes inoperative again.
Important! This is not available on a DK40i system with a TDDU installed.
Installing Power Failure Emergency Transfer
➤Connect a standard telephone to the PF1 connector in the Base KSU (see Figure 3-13).
Testing Power Failure Emergency Transfer
1. Turn the system power switch OFF.
2. Lift the emergency standard telephone handset, and verify that there is CO dial tone.

DK40i Installation
Power Supply Removal and Replacement
Strata DK I&M 5/99 3-19
DK40i Installation
Figure 3-13 Base KSU Power Failure Transfer (PFT) Circuit Diagram
Power Supply Removal and Replacement
The power supply (TPSU16A) comes factory-installed in the Base KSU; if necessary, it can be
removed and replaced.
Power Supply Removal
1. Make sure that the power supply switch is OFF and that the AC power cable is not plugged
into an outlet. Confirm that the green AC LED is not lit (see Figure 3-14).
Figure 3-14 Power Supply (TPSU16A)
2. Unplug reserve battery cable from BATT connector of power supply.
4
3
5
2
MOD Jack CO1
(Base KSU)
MDF TCOU
CO
Line
MOD Jack PF1
(Base KSU)
R
T
MDF
PFT
Standard
Telephone
T
R
Power Fail
Connection
Power Available
Connection
TCOU
CO Line 1
2155
FG2
POWER SUPPLY ASSEMBLY
MODEL
INPUT: AC127V 2.2A 60 HZ
OUTPUT: -27.3V 2.8A. -27.3V 0.2A
V. 1A 1996-05 00001
TOSHIBA CORPORATION
TPSU16A
MADE IN
WARNING
Hazardous voltage inside!
If servicing required
remove A. C. plug.
1 2
+
-
BATT
PN2
FG4
1 2
AC DC
DC POWER
FG
FG1
-24V
-24V
1643
1
2
3 4
5678