Toshiba Strata Dk24, Dk56, Dk96 Instruction Manual

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STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
number of electronic telephones by two; 
each HDCB takes one port, and reduces 
*-the maximum by one. 
l Connections from the PEKU to the MDF 
are made with 25-pair amphenol connec- 
tors. Each port normally uses 2-pair wiring; 
3-pair wiring is required when off-hook call 
announce is supported. 
l A maximum of three PEKUs can normally 
be installed in DK24 to provide twenty-four 
electronic telephone ports, seven in DK56 
to provide fifty-six electronic telephone 
ports, and twelve in DK96 to provide nine- 
ty-six electronic telephone ports (see Table 
4 
NOTE: 
The system capacities above apply only 
when connecting 6500-series telephones to 
PEKU PCBs. If earlier series Toshiba elec- 
tronic telephones are used, the capacities 
are reduced (see Table K). 
Off-hook Call Announce Upgrade Unit 
(EOCU): An optional off-hook call announce 
upgrade unit mounts on top of the PEKU or 
PESU piggy-back style. It is required on every 
PEKU or PESU that supports stations receiv- 
ing off-hook call announce. The unit provides 
two off-hook call announce channels, which 
are shared by all electronic telephone circuits 
on a PEKU or PESU. An EOCU is not required 
on PDKUs supporting stations with off-hook 
call announce (see Table L). 
Standard Telephone Interface Unit (PSTU): 
The PSTU provides an interface between 
standard telephones and the system. It adds 
eight standard telephone ports, and has a 20 
Hz square-wave ring generator. 
l In addition, the PSTU provides support for 
numerous Toshiba-supplied and customer- 
supplied peripherals. Toshiba peripherals 
include: 
l Digital Voice Messaging Systems: One 
standard telephone port is required for 
each voice mail port. l Power Failure Transfer Unit: The 
PSTU 
provides a -24VDC output for controlling 
a power failure’;fransfer unit.(DPFT). 
Customer-supplied peripherals include 
those listed below: 
l Auto attendant device 
l Dictation equipment 
l Facsimile 
l Off-premises station 
l Modem 
l Standard telephone 
l Voice mail device 
A maximum of three PSTUs can normally 
be installed in DK24, providing twenty-four 
standard telephone ports; seven PSTUs 
can normally be installed in DK56, provid- 
ing fifty-six standard telephone ports; and 
twelve in DK96, providing ninety-six stan- 
dard telephone ports (see Table K). 
Connections from the PSTU to the MDF 
are made with 25pair amphenol connec- 
tors, one pair per port. 
If any devices which send DTMF signals 
are connected to the PSTU, a CRCU must 
be installed on the PCTU2, PCTU3, or 
PCTUS. 
Standard/Electronic Telephone Interface Unit 
(PESU): The PESU PCB provides an inter- 
face with a combination of two standard tele- 
phone and four electronic telephone circuits. 
The two standard circuits are identical to 
PSTU circuits, providing an interface with 
standard telephones and/or peripheral 
devices. The four electronic telephone circuits 
are identical to the PEKU circuits; they provide 
interface to Toshiba electronic telephones 
(with/without off-hook call announce), BGM 
source connection, and an HDCB, but do not 
support a DSS console. 
l The PESU can accept an EOCU sub- 
assembly PCB to support electronic tele- 
phones that receive off-hook call 
announce. 
l If any devices that are connected to the 
PESU standard telephone ports send 
DTMF signals, a CRCU must be installed 
on the PCTU PCB. 
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							STRATADK . 
GENERALDESCRIPTION 
DECEMBER1990 
b TABLEL 
OPTIONALSUBASSEMBLIES 
^ 
Subassembly Host Capacity 
Function 
EOCU PEKU and PESU 1 for PEKU or PESU 
that supports OCA Provides OCA path for 8 circuits 
on PEKU or 4 circuits on PESU. 
CRCU 
(4 or 8 circuits) PCTU or PCTUS 1 per PCTlkystem Provides DTMF receiver for DISA, 
standard telephone circuits, and TIE lines. 
IMDU PIOU or PIOUS 1 per PlOWsystem Provides remote maintenance 
interface with built-in modem. 
HHEU 
HVSU 
HVSI 
DVSU 6500-series EKT/ 
1 OOO-series DKT 
6500-series EKT 
6500-series EKT 
1 OOO-series DKT 1 per EKT/DKT 
1 per EKT 
1 per EKT 
1 per DKT Provides interface for headset and loud 
ringing bell. 
Provides interface for EKT to receive OCA. 
Provides interface for EKT to receive OCA. 
Provides interface for DKT to receive OCA. 
System Capacity and Configuration 
This section provides an overview of system 
configuration requirements and considerations. 
port/CO line capacity. Generally, each optional 
PCB, e.g. PEMU, PIOU, PIOUS, or PEPU, 
installed in the cabinet occupies a slot that may 
have been used to support eight station ports or 
four CO lines. 
Table A I illustrates each system’s various 
station/CO line capacities. 
For example, the 
STRATA DK96 system can have 36 CO lines and 
40 stations. Optional upgrades impact the station The number of station ports or CO lines pro- 
vided by each PCB is given in Table K. Tables L 
and M list each type of subassembly and option- 
al unit that can be installed. 
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							STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
TABLE M 
OPTIONAL UNITS 
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Option unit Interface Capacity 
Function 
HDSS 6560 PEKU (circuits 7 & 8) 4 per system with PCTU2/3 Provides a 60-button DSS console 
:DSS console) 3 with PCTUS 
that functions with electronic 
telephones. Buttons are flexibly 
assigned as CO line, speed dial, 
and DSS. 
DDSS10605 PDKU (circuit 8) 4 per system with PCTUB Provides a 60-button DSS 
(Digital DSS console that functions with 
Console) digital telephones. Buttons 
are flexibly assigned as CO 
line, speed dial, and DSS. 
HDCB (door PEKU or PESU (circuit 5) 4 per system with PCTU2/3 Provides MDFB door phone and 
Ihone control) 3 with PCTUS 
door lock control interface. 
MDFB HDCB control box 12 per system (PCTU2 
l Door monitor with two-way talk 
(each HDCB supports or 3) 
9 per system (PCTUS) path to system telephones. 
three MDFBs) 
l Door bell that rings designated 
electronic and digital telephones. 
l Microphone for talkback when 
paged over HESB amplified speaker 
HESB 
DPFT PIOU, PIOUS, or PEPU for 
1 per PIOU, PIOUS, External page amplifier 
page, speaker, or amplifier or PEPU 
and speaker. 
DKT/EKT with HHEU PCB 1 per DKTIEKT (with 
Loud ringing bell. 
for loud ringing bell HHEU PCB) 
PSTU 
2 max, DK24 
3 max, DK56 Connects up to 8 CO lines directly 
5 max, DK96 to standard telephones if the 
system’s AC power is removed. 
ntegrated DIU PDKU via DKT 8 per PDKU; 
(PDIU-Dl)5 1 per DKT Used for transmitting and receiving 
data between terminals, personal 
computers and devices connected 
to other PDIU-Dls or to modems, 
printers and computers connected 
to PDIU-DSs. The PDIU-DI is also 
used to provide personal computer 
access to outside dial up data 
services and/or bulletin boards via 
modem pooling. 
Zandalone DIU PDKU (any circuit) 8 per PDKU 
For making RS-232 switched data 
(PDIU-DS)5 connections for modem pooling, 
printer sharing, and host! 
mainframe computer accessing. 
DSS AND DDSS CONSOLE NOTES: 
1. No additional hardware is required to use the DSS and DDSS consoles. 
2. The DDSS and DSS consoles are assigned to associated digital and electronic telephones, 
respectively 
in programming. 
3. DDSS and DSS consoles cannot be connected to PESU electronic telephone circuits. 
DOOR PHONE NOTES: 
1. A maximum of three HDCBs are allowed per system equipped with a PCTUS or four HDCBs 
with a PCTU2/3, to support up to nine or twelve door phones (MDFBs), respectively. 
2. One electronic telephone (PEKU or PESU) port, always the fifth circuit port, is required per HDCB. 
3. HDCBs can only be connected to PEKU or PESU port numbers 04, 12,20, and/or 28. 
4. One 
door lock control can be configured on each HDCB in place of one door phone., 
5. HDCBs cannot be connected to PDKU station ports. 
6. Requires Release 3 software. 
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							STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
4 FEATURES 
STRATA DK digital key systems Offer a broad range of features and services, which are summarized ‘.. 
in Tables N, 0, and P. * . 
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TABLE N 
SYSTEM FEATURES 
The system features listed below function on all STRATA DK systems. 
Standard 
Account Codes (Forced/Voluntary/Verifiedt) 
l 
All Call Voice Page l 
Alternate Point Answer l 
Automatic Hold/Park Recall 0 
Automatic Release from Hold/DISA l 
Background Music* l 
Centrex/PBX Compatible l 
Centrex Ringing Repeat l 
CO Line Groups l 
CO Line Queuing l 
Conferencing l 
Credit Card Dialingt l 
DAY/NIGHT Modes 0 
Delayed Ringing 
Distinctive CO Line/Intercom Ringing 
l 
DTMF Back Tone l 
DTMF and Dial Pulse CO Line Compatible l 
DTMF Signal Time (80/l 60 ms) l 
Dual FCC Registration l 
Flexible Button Assignment 
Flexible Intercom Numbering 
Flexible Line Ringing Assignment 
l Immediate 
l Delay 1 
l Delay 2 
Flexible Port/Line Assignment 
Group Paging 
l 
Least Cost Routing 
Live System Programming 
Memory Protection 
l 
Message Waiting 
Optional 
Alarm Sensor* 
l 
Data Switchingt* l 
Direct Inward System Access l 
Door Lock Control* 
Door Phones 
Night Ringing Over External Page* 
l 
l 
Night Pickup Code l 
Night Ringing Over Selected Page Zones l 
Off-premises Station l 
Page Interface Music-on-Hold* 
Night Ringing Answer Code 
Non-blocking Talk Paths 
Outgoing Call Restriction 
Pooled CO Lines 
Privacy/Non-privacy 
Station Hunting 
System Programming through Station 
System Speed Dial 
Tandem CO Line Connections 
Tenant Service 
Toll Restriction 
Toll Restriction Override by System Speed 
Dial 
Transfer Privacy 
Traveling Class of Service? 
Unlimited Handsfree Intercom Paths 
Unrestricted Call Transfer over Intercom 
Voice Mail Interface 
l Automated Attendant 
l Call Forward to Voice Mailbox 
l Message Waiting Indication 
l Voice Mail Control via Digital/Electronic 
Station 
l Feature Integration 
l Voice Mail identification Codes 
Voice or Tone Signaling 
l Voice First 
l Tone First 
Wall or Table Mounting 
Page Zones 
Power Failure Transfer* 
Relay Service* 
. External Page/Door Lock Relay 
l Night/Hold Relay 
Remote Administration and Maintenance* 
Reserve Power* 
Station Message Detail Recording* 
TIE Lines 
*May require customer-supplied peripheral hardware; see the detailed feature descriptions 
t Requires 
Release 3 software. -27-  
						

							STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
TABLE 0 
c--. 
DIGITAL AND ELECTRONIC TELEPHONE FEATURES 
. 
The station features listed below are accessible from each digital and electronic telephone. 
l Account Code Button 
l Automatic Busy Redial 
l Automatic Callback 
l Automatic Hold/Park Recall 
l Automatic Line Selection 
l Background Music with Station Control* 
l Busy Override 
l Call Forward 
l All Calls 
l Busy 
l No Answer 
l Busy/No Answer 
l Fixed 
l Call Park 
l Call Pickup 
l Call Transfer with Camp-on 
l CO/Centrex/PBX Feature Buttons 
l Direct Station Selection Buttons 
l DISA Security Code Revision 
l Distinctive LED Indications 
l Incoming Call 
. In-use 
l On-hold 
l Distinctive Station Ringing 
l Do Not Disturb 
l Do Not Disturb Override 
l Data Button 
l Direct Station Selection Console Features 
l Automatic Line Hold 
l Flexible Buttons 
l All Call Voice Page Button 
l CO Lines 
l DSS 
9 Night Transfer Button 
l Speed Dial 
l Voice or Tone Signaling 
l Call Forward Override 
l Liquid Crystal Display Features 
l Alphanumeric Messaging Standard 
l DP/DTMF Mode Change 
l Exclusive Hold 
l Executive Override 
l Fixed Call Forward 
l Handsfree Answerback 
l Hearing Aid Compatible 
l Message Waiting/Flash 
l Microphone Control Button 
l Modem Button 
l Modular Handset and Line Cords 
l On-hook Dialing 
l Pooled Line Buttons 
l Privacy Button-t 
l Privacy Release Button 
l Privacy Override 
l Private CO Lines 
l Pushbutton Dialing 
l Release Button 
l Remote Retrieval of Held Calls 
l Repeat Last Number Dialed 
l Ringing Line Preference 
l Saved Number Redial 
l Speed Dial Buttons 
l Station Speed Dial 
l Timed Reminder 
l Toll Restriction Override Code Revision 
Optional 
l Busy Lamp Field Indication 
l Busy Station Messagingt 
l Called Station Messaging 
l Calling Station Messaging 
l CO Line Identification 
l Group Station Messagingt 
l Intercom Name/Number Display 
l Speed Dial Memo 
l Station Identification 
l Timed Reminders with Messages 
l Modular Headset Interface 
l Off-hook Call Announce 
*May require customer-supplied peripheral hardware; see the detailed feature descriptions 
t Requires Release 3 software. 
-28-  
						

							STRATADK 
GENERALDESCRIPTION 
DECEMBER1990 
TABLEP 
STANDARD TELEPHONE FEATURES _ 
The features listed below are accessible from a standard telephone by dialing access codes. See 
both System Features and Digital and Electronic Telephone Features sections for detailed descriptions. 
Standard 
l All Call Voice Page 0 
l Automatic Callback 0 
l Automatic Hold/Park Recall 0 
l Busy Override 0 
l Call Forward 0 
l All Calls 0 
l Busy 0 
l No Answer 0 
l Busy/No Answer 0 
l Call Park 0 
l Call Pickup 0 
l Call Transfer with Camp-on 0 
l Centrex/PBX Compatible 0 
l CO Line Queuing 
l Conference (four party, including two CO l 
lines) 
l Distinctive Ringing (CO vs. Intercom calls) 
l Do Not Disturb Override 0 
0 
Optional 
l Direct Inward System Access 0 
Off-premises Station  DP/DTMF Mode Change 
Executive Override 
Forced and Voluntary Account Codes 
Group Paging 
Least Cost Routing 
Message Waiting (set only, not receive) 
Night Pickup Code 
Remote Retrieval of Held Calls 
Repeat Last Number Dialed 
Station Hunting 
Speed Dial (Station and System) 
Toll Restriction 
Toll Restriction Override by System Speed 
Dial 
Toll Restriction Override Code Revision 
Voice Mail Interface 
Voice Signaling (to, not from) 
System Features 
Account Codes (Forced/Voluntary/Verified)t: 
Account codes may be forced or voluntary; 
and may be verified or not. Account code digit 
length is 4 u 15 digits and set system wide; 
this digit length applies to all types and combi- 
nations of account codes used in the system. 
Account codes are sent out on the system’s 
SMDR port with each call record as calls are 
completed. 
l Forced: Each station may be required 
(forced by programming) to enter an 
account code before being allowed to dial 
a telephone number from selected CO 
lines, 
l A station may be forced to dial account 
codes on some CO lines but not others, 
depending on how the CO line is set in 
t Requires Release 3 software. 
system programming-forced or volun- 
tary. 
l Each station in the system may be pro- 
grammed so that account codes 
entered from that station will be verified 
or not verified. 
l Voluntary: Voluntary account codes may 
be entered by any station at any time dur- 
ing a telephone call by pressing the 
B button or dialing an access 
code. 
l If a voluntary account code is dialed 
from a digital or electronic telephone, 
the call will not be interrupted. If dialed 
from a standard telephone, the call will 
be placed on hold while the code is 
being entered; therefore, the account 
code is normally entered from standard 
telephones at’ the beginning or end of 
the telephone conversation. 
-29-  
						

							STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
l Each station in the system may be pro- 
*---- grammed so that account codes entered 
from that station will be verified or not 
verified. 
l Verifiedt: Each station is set independent- 
ly in system programming so that account 
codes, forced and voluntary, will be verified 
or not verified. 
l The system may be programmed to 
have 300 verified account codes 
total-voluntary and forced. 
l A verified account code may be system 
programmed so that all the digits (4 N 
15) of the code are verified, or only the 
first portion (programmable length) of 
the code is verified. 300 blocks of par- 
tially verified account codes can be 
established, and each of these blocks 
can contain a near limitless amount of 
variations. For example, if the required 
length of each account code in the sys- 
tem is five digits, and if each of the 
available 300 verified account codes is 
three digits, then there would be 100 
combinations (00 u 99) for each verified 
account code. In this instance, there 
would be 30,000 partially verified 
account codes available, 100 combina- 
tions for each of the 300 verified 
account code blocks. 
l Each verified account code can be 
assigned to a toll restriction class of 
service in system programming. When a 
verified account code is dialed at a sta- 
tion, that station’s normal toll restriction 
class is temporarily replaced by the veri- 
fied account code’s toll restriction class 
of service (the station reverts back to its 
normal restriction class when the call is 
completed). The account code will be 
sent out on that station’s SMDR call 
record. 
l Verified account codes may be added, 
deleted, or changed by users from sta- 
tions enabled to in system program- 
ming. 
NOTE: 
The 911 emergency number bypasses 
forced verified account code requiremenkt 
t Requires Release 3 software. 
Alarm Sensor: When configured with a cus- 
tomer-supplied alarm, the sensor detects 
when the alarm relay-is activated -and causes 
all digital and electronic telephones to sound a 
startling tone. The digital or electronic tele- 
phone alarm tone is reset from any station pro- 
grammed with an m button. This feature is 
optional, and an option interface PCB (PIOU 
or PIOUS) is required in order to support it. 
All Call Voice Page*: A user can page to all 
station speakers simultaneously by dialin a 2- 
digit access code or by pressing the A 
d but- 
ton. The system can also be programmed to 
page to an external zone speaker as part of 
the all call page. See External Page Interface 
and External Zone Paging. 
Alternate Point Answer: Allows users to 
answer transferred CO calls from any station 
that shares the CO line button’s appearance. 
Automatic Hold/Park Recall+: If a station parks 
or puts a call on hold, and a pre-programmed 
period of time lapses without the call being 
retrieved, the call automatically sounds a dis- 
tinctive reminder tone at the station which initi- 
ated the hold/park. Each’station’s recall time 
can be set individually in programming. 
Automatic Release from Hold/DISA: If a CO 
line is put on hold (or is used for a DISA call), 
and the outside party hangs up, the system 
disconnects automatically, releasing the CO 
line(s). Individual CO lines can be program- 
med to either recognize or ignore the discon- 
nect signal from the central office. This feature 
will not operate unless the telephone compa- 
ny’s central office provides a disconnect signal 
to the system. 
Background Music: Background music can be 
broadcast two different ways; over digital 
and/or electronic telephone speakers, and 
over optional external paging speakers. 
l When background music is broadcast over 
digital and/or electronic telephone speak- 
ers, the music source connects directly to 
the system’s controller PCB (PCTU) or a 
designated (PEKU or PESU) station port. 
No optional hardware is required. 
l When external speakers are used, an 
option interface PCB (PIOU, PIOUS, or 
*Available using standard or electronic telephones. 
-3o-  
						

							STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
data equipment, including personal computers, 
printers, and modems. Asynchronous data can 
t%?ransmitted at speeds up to 19.2 kpbs. The 
system allows personal computer (PC) key- 
board dialing (up to 9600 bps) using the AT 
command set. When used in conjunction with 
PC desk top software, dial-by-name and other 
dial directories may be set up inside the PC. 
The system provides four data security groups 
to restrict data calls between groups. The sys- 
tem also provides program options to allow 
modems to be used in pooling groups. 
DAY/NIGHT Modes: The system has three 
available modes, DAY, DAY2 and NIGHT. 
Each mode can be assigned a distinct CO-to- 
station ringing arrangement for handling calls 
differently. The system can be programmed 
with either two or three modes (which can be 
changed by any station programmed with a 
q 
button): 
Two modes: Three modes: 
DAY DAY 
NIGHT DAY2 
NIGHT 
Delayed Ringing: If a CO line call rings to a sta- 
tion and is not answered, alternate stations 
can be programmed to ring 12 or 24 seconds 
later. Twelve seconds is approximately 3 rings; 
24 seconds, 6 rings. Delayed ringing is selec- 
tively provided for each line, by each station. 
Direct Inward System Access: Using a DTMF 
telephone, outside callers can dial internal sta- 
tions (DISC) or outgoing CO lines directly, 
without going through a receptionist or opera- 
tor. Any number of CO lines can be pro- 
grammed with the direct inward system access 
(DISA) feature. 
l The caller dials the DISA CO line number 
and hears ringing. Then, a tone sounds for 
nine seconds. While the tone is sounding, 
the caller may dial a station number or out- 
going CO line access code. If a busy sta- 
tion is dialed, the caller can dial another 
station. If no number is dialed and the 
nine-second interval elapses, the call is 
transferred to a pre-assigned ringing 
arrangement. 
l If set in program memory, an optional 
security code must be dialed to make 
DISA calls throtigh the system via CO 
lines, but is never required to dial internal 
stations directly. The DISA security code (1 
u 15 digits) may be set, changed, or can- 
celed from system programming and/or 
designated stations. If the DISA security 
code is not set in memory, it is not neces- 
sary for dialing out on CO lines via DISA. 
l A built-in 4-minute timer automatically dis- 
connects DISA calls in situations where 
the central office does not provide a 
release signal. After a warning tone, this 
timer can be reset by the caller dialing B to 
extend the call another four minutes as 
many times as required to finish the call. 
This timer is always operational during 
DISA calls to prevent CO line lock-up. 
l A CRCU PC6 must be installed on the 
PCTU PCB to allow DISA operation. 
l A DISA CO line can be assigned to any 
Night Transfer ringing mode, allowing CO 
lines to ring normally in one mode (i.e. 
DAY) and become DISA lines when the 
system is transferred to another mode (see 
DAY/NIGHT Modes). 
l DISA CO line calls have complete system 
privacy and cannot be overridden. 
l The system provides DISA class of serv- 
ice, which allows Toll Restriction to be 
applied to DISA CO line calls. 
Distinctive CO Line/Intercom Ringing+: When 
CO and intercom calls ring a station, the ring- 
ing is different. This helps the user determine 
the type of each incoming call before answer- 
ing. (This feature is optional for single-line tele- 
phones and standard for digital and electronic 
telephones.) 
l A further distinction is available for elec- 
tronic telephones as a station feature. 
Stations in close proximity may be pro- 
grammed for a unique ring on incoming 
CO calls. This allows individual station 
users to recognize their telephone’s ring- 
ing. See Station Features, Distinctive 
Station Ringing. 
*Available using standard or electronic telephones. 
-32-  
						

							Door Lock Control: Any telephone program- 
med with a door lock button can unlock a door. 
Pressing the button activates the electronic 
door lock, and the lock opens for 3 or 6 sec- 
onds, as specified in programming. The actual 
electronic door lock mechanism must be sup- 
plied by the customer. This feature is optional. 
An option interface PCB (PIOU, PIOUS, or 
PEPU) or an HDCB is required to support it. 
Up to five door lock controls can be installed 
with a designated button for each (four are 
provided by each of up to four HDCBs and 
one via either a PIOU, PIOUS, or PEPU-see 
System Features, Relay Service). If a PCTUS 
is installed, the maximum number of door lock 
controls is four. 
Door Phones: The door phone has several 
applications. 
0 
0 For example, it can be used in conjunction 
with door lock control, outside an entrance 
which must be screened. When a button is 
pressed on the door phone, any or all digi- 
tal and/or electronic telephones in the sys- 
tem can be programmed to ring with a dis- 
tinct door phone tone. Any digital or elec- 
tronic telephone can answer the ring and 
converse with the person at the door 
phone. The door lock can be opened if the 
person requires entry. 
Door phones may be programmed to ring 
any combination of digital and/or electronic 
telephones; they may even be pro- 
grammed to ring over external page when 
the system is in NIGHT mode. 
A second function of the door phone is that 
of a monitor. Any telephone can call the 
door phone and monitor its immediate 
area. 
A maximum of twelve door phones are 
allowed per system with a PCTU2/3 and 
nine with a PCTUS. A maximum of four 
HDCBs can be installed to.support up to 
three door phones each. Each HDCB 
requires the support of one electronic tele- 
phone interface unit (PEKU or PESU). 
When multiple door phones are installed, 
they may ring with two distinct door phone STRATA DK 
GENERAL DESCRIPTION 
DECEMBER 1990 
tones. See Toshiba Peripheral Equipment, 
Door Phone Control Unit. 
_ 
NOTE: * 
The PDKU cannot support an HDCB. 
DTMF Back Tone: The system can be pro- 
grammed to allow or prevent DTMF tones from 
being returned to an electronic or digital tele- 
phone when its user dials on CO lines or 
sends digits to voice mail. 
DTMF and Dial Pulse CO Line Compatible*: 
The system works with either DTMF or rotary 
dial pulse CO lines programmed on a line-by- 
line basis. 
DTMF Signal Time (801160 ms): The standard 
DTMF dial signal time is 160 milliseconds, but 
it may be reduced to 80, if the central office or 
peripheral equipment, such as voice mail 
devices, will function with the reduced signal 
time. The DTMF signal time is set indepen- 
dently for CO line outdialing and voice mail 
auto dial digits via system programming. 
Dual FCC Registration: The system can be 
configured as either key or hybrid, with sepa- 
rate FCC registration numbers for each type. 
The appropriate configuration for an individual 
system depends on its function. For more 
details; refer to General End User Information, 
located in the front of this document. 
Flexible Button Assignment: Each digital tele- 
phone has 20 buttons and each electronic 
telephone has 10 or 20 buttons which may be 
flexibly programmed as a CO or as any of the 
different types of features. 
Flexible Intercom Numbering*: A station inter- 
com number can be programmed to have up 
to four digits. The numbers can be assigned to 
any station port, and can be programmed in 
any sequence. 
Flexible Line Ringing Assignment: Each CO 
line can be programmed to ring (or not ring) at 
each station in the system. A different ringing 
*Available using standard or electronic telephones. 
-33-