Toshiba Strata Dk24, Dk56, Dk96 Instruction Manual

							INSTALLATION-SITE REQUIREMENTS 
SECTION 200-096-203 
FEBRUARY1991 
TABLE34 
SUMMARY 
OFELECTRICAL/ENVIRONMENTALCHARACTERlSTlCS . 
GENERAL 
Primary Power 
Input AC 
AC Frequency 
DK24 power supply 
DK56 power supply 
DK96 power supply 
85VAC - 135VAC 
50/60 Hz 
65 watts 
140 watts 
230 watts 
I 
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; -26.3 m -27.8 
+ 5VDC; + 4.5 m + 5.5 
- 5VDC; - 4.5 - - 5.5 
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 f 0.5V 
PSTU (before November 1989) 
Ring Voltage 
Ringing Capability Square Wave: 
190 f 20V peak-to-peak (no load) 
up to two ringers maximum per circuit. 
PSTU2/PESU (circuits 1 & 2) 
Ring Voltage Square Wave: 
Low position 130 +_ 20V peak-to-peak (no load) 
High position 190 f 25V peak-to-peak (no load) 
Ringing Capability Two ringers maximum per circuit, high or low position 
BTU Rating 
DK24 PEKU 3 
103 BTUs (30 wh) 
PCOU 2 
PCTUS 1 
PIOUS 1 
Electronic Telephone 24 
DK56 
PEKU 5 205 BTUs (60 wh) 
PCOU 3 
PCTU 1 
Electronic Telephone 40 
I 
DK96 
PEKU 9 348 BTUs (102 wh) 
PCOU 5 
PCTU 1 
Electronic Telephone 72 
‘ 
I 
3-4  
						

							6 SITE CONSIDERATIONS (continued) 
6.00 The following precautions should be adhered 
to when installing telephone wiring: GROUND 1; THIRD WIRE GRO;ND 
 TO AC POWER CORD 
WARNING! 
1. Never install the telephone wiring dur- 
ing a lightning storm. 
2. Never install the telephone jacks in wet 
locations unless the jack is specifically 
designed for wet locations. 
3. Never touch uninsulated telephone 
wires or terminals unless the telephone 
line has been disconnected at the net- 
work interface. 
4. Use caution when installing or modify- 
ing telephone lines. 
7 GROUNDING REQUIREMENTS (continued) 
7.00 In addition to the grounding provisions in 
Paragraph 5, the following grounding provisions 
must be adhered to (Figure 3-3): 
1) Redundant and independent equipment 
grounding conductors are to be installed be- 
tween the product and the wiring system ground. 
2) One of the equipment grounding conductors 
(ground 1) shall be an insulated grounding 
conductor that is not smaller in size and is 
equivalent in insulation material and thickness 
to the grounded and ungrounded branch-circuit 
supply conductors, except that it is green with 
or without one or more yellow stripes. The 
grounding conductor is to be installed as part of 
the circuit that supplies that system and is to be 
connected to ground at the service equipment. 
3) The other conductor (ground 2) shall comply 
with the general rules for grounding contained 
in Article 250 of the National Electrical Code, 
NFPA 70, but shall not depend on the cord and 
plug of the product. 
7.10 Second Ground Test 
WARNING! 
Hazardous voltages that may cause death INSTALLATION-SITE REQUIREMENTS 
SECTION 200-096-203 
FEBRUARY 1991 
THIRD WIRE 
AC GROUND 
  DKSU 
 II 
A+ 
t 
A 
ELECTRICAL 
SYSTEM GROUND POWER 
’ SUPPLY 
BUILDING GROUND OR 
COLD WATER PIPE 
*f 
INSULATED 
GROUND WIRE FRAME GROUND 
SCREW ON DKSU 
GROUND 2; PER GENERAL RULES 
OF ARTICLE 250 OF 
THE NATIONAL 
ELECTRICAL CODE, NFPA70 
FIGURE 3-3 KSU GROUNDING DIAGRAM 
or injury may be exposed during the 
following test. Use great care when 
working with AC power line voltage. 
1) Refer to Figure 3-3. 
2) Disconnect the AC plug of the system to make 
sure that the two earth ground paths are 
separated. 
3) With a suitable volt/ohm meter, perform a 
reading between A and B. Verify that the 
readings do not exceed the figures listed below. 
If they do, the condition must be corrected by a 
qualified electrician before the system is con- 
nected. 
A to B: 1 volt maximum 
then 
A to B: 1 ohm maximum 
3-5  
						

							INSTALLATION-SITE REQUIREMENTS 
SECTION 200-096-203 
FEBRUARY1991 
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I’ 
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3-6  
						

							TOSHIBASYSTEM PRACTICES 
DIGITALKEYTELEPHONESYSTEMS INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY1991 
Stra taExx 
RELEASE 1,2, and 3 
INSTALLATION 
CHAPTER FOUR 
SYSTEM CONFIGURATION  
						

							INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY1991 
PARAGRAPH TABLEOFCONTENTS 
SUBJECT . 
PAGE 
1 
1.10 
2 
I 2.10 
2.20 
2.30 
2.40 
2.50 
1 2.60 
2.70 
2.80 
I 2.90 
3 
4 
4.00 
4.10 
4.20 
I 4.30 
4.40 
TABLE 
4-A 
4-B 
4-c 
4-D 
4-E 
4-F 
FIGURE 
4-1 
4-2 INTRODUCTION ..................................................................................................... 
System Considerations.. ...................................................................................... 
OPTION INTERFACING .  ... ..................................................................................... 
DDSSDSS Consoles 
.......................................................................................... 
Data Interface Units (PDIU-DI 
and PDIU-DS) ..................................................... 
Door Phones ....................................................................................................... 
E & M TIE Lines . 
. . ............................................................................................... 
Off-hook Call Announce ...................................................................................... 
Data and Modems with 
Release 1 or 2 ............................................................... 
Miscellaneous ...................................................................................................... 
Ports .... ................................................................................................................ 
CO Lines ............................................................................................................. 
WORKSHEETS ....................................................................................................... 
CONFIGURATION GUIDE, 
WORKSHEET 1 ...................................................... 
CONFIGURATION GUIDE, WORKSHEET 2.. .................................................... 
CONFIGURATION GUIDE, WORKSHEET 3.. .................................................... 
CONFIGURATION 
GUIDE, WORKSHEET 4.. .................................................... 
CONFIGURATION GUIDE, WORKSHEET 5.. .................................................... 
CONFIGURATION 
GUIDE, WORKSHEET 6.. .................................................... 
CONFIGURATION GUIDE, WORKSHEET 7.. .................................................... 
SYSTEM HARDWARE CONFIGURATION ............................................................ 
General ................................................................................................................ 
System Hardware Assignment 
Record ............................................................... 
Door Phone Hardware Configuration 
Notes ........................................................ 
DSSDDSS Console Hardware Configuration Notes.. ......................................... 
Data Interface 
Unit (DIU) Configuration Notes .................................................... 
TABLELIST 
TITLE 
DK24/DK56/DK96 MAXIMUM CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
SYSTEM CONTROL PCB (PCTU) CONFIGURATION INFORMATION . . . . . . . . . . . . . . . . 
UNIVERSAL SLOT/PCB CAPACITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .._.. 
OPTIONAL INTERFACE 
PCB INFORMATION . . . . . . . . . . . . . . . . . . . . . . .._............................. 
OPTIONAL ADD-ON UNIT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
OPTIONAL SUBASSEMBLY PCB CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
FIGURE LIST 
TITLE 
PCB CONFIGURATION CHART 
. . . *................................................................,...... 
HARDWARE 
CONFIGURATION EXAMPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 
4-l 
4-3 
4-3 
4-4 
4-5 
4-5 
4-5 
4-6 
4-7 
4-7 
4-7 
4-7 
4-8 
4-10 
4-12 
4-13 
4-14 
4-15 
4-17 
4-23 
4-23 
4-23 
4-25 
4-26 
4-26 
PAGE 
4-2 
4-18 
4-19 
4-20 
4-21 
4-22 
PAGE 
4-1 
4-28 
4-i  
						

							INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY 1991 
I 
1 INTRODUCTION 
1.01 STRATA DK systems are flexible in their 
ability to meet varied system needs. A modular 
building block approach allows the addition of vari- 
ous parts to meet system needs and applications. 
A universal slot concept is used in the KSU, which 
means that a PCB slot in the KSU can accept any 
one of a number of different PCBs. This is con- 
trasted with a dedicated slot approach (used in 
previous STRATA systems), where a particular slot 
can only accept a specific PCB, such as a CO line 
interface PCB. DK24 has six universal slots, DK56 
has eight, and DK96 has 14. This increased flexibil- 
ity in STRATA DK means that tradeoffs can be 
made between the number of CO lines and stations 
in a system application. This is illustrated in Figure 
4-1. 
1.02 Figure 4-l shows that in most configurations, 
four CO lines can be traded for eight stations. 
Conversely, for every eight stations that are given 
up, four CO lines can be added. The maximum 
quantities of 16 CO lines for DK24,20 CO lines for DK56, and 36 CO lines for DK96 are based on 
squared systems. Software allows 16 CG lines with 
PCTUSl and 36 CO lines with PCTU (1, 2, or 3). 1 
Similarly, the 24 station (PCTUSI) and 96 station 
(PCTUI, 2, or 3) limits are software limitations. 
I 
1.10 System Considerations 
1.11 When no external options or TIE lines are 
installed and only CO lines and station PCBs are 
exchanged, the maximum configurations can be 
summarized in Table 4-A. 
1.12 Table 4-A shows the maximum number of 
1 OOO-series digital telephone, 6500-series tele- 
phones, and/or standard telephones that can exist 
in each system. Due to power availability, the 
numbers decrease if using 2000-, 3000-, 6000-, or 
6005-series electronic telephones, a PEMU PCB, 
or digital telephones with PDIU-Dls connected. I 
When mixing different series telephones and/or if a 
PEMU PCB is installed, use the Configuration 
Guide, worksheet 7, to verify that the power sup- 
plied is greater than the power used. 
40 
36 
32 
28 
24 
AVAILABLE 
CO LINES 
20 
16 
12 
8 
4 
NOTES (DK24): 
1. 24 stations are available 0 
with PCTUSl -equipped DK24. 
2. 32 stations are available 
with PCTU-(1, 2, or 3) equipped 
(WITHOUT 
SYSTEM OPTIONS) 
AVAILABLE STATION PORTS 
DK24. I 
-_-__-- - . --- --~~~ 
FIGURE 4-l-PCB CONFIGURATION CHART 
4-1  
						

							INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY1991 
DK24 (PCTUS) 
I CO Lines 
16 16 16 16 
12 24 12 24 
8 24 8 32 
4 24 4 323 
0 24 0 323 
Stations 
Table 4-A 
OK24/56/96 MAXIMUM CONFIGURATIONS 
DK 24 (PCTU 1,2. or 31 DK56 (PCTU 1.2. or : I I 
CO Lines Stations 
. 
CO Lines 
, , 
Stations 
20 24 
16 32 
12 40 
8 48 
4 
56 
0 64 
DK96 (PC- 
CO Line5 
36 
32 
28 
24 
20 
16 
12 
8 
1, 2, or: 
Stations 
NOTES: 
1. The station capacities apply to any combination of standard telephones, IOOO-series digital 
telephones and 6500-series electronic telephones (only). Station capacities using other 
Toshiba electronic telephones are given on worksheet 7. 
2. Installing a TIE line (PEMU) PCB or an optional interface (PIOU/PIOUS/PEPU) PCB 
reduces available CO lines by four or available station ports by eight. 
3. The DK24’s 32-station limit is a result of power supply capacity. 40 
48 
56 
64 
72 
80 
88 
96 
1 .13 System Control PCB Considerations. DK 
systems can be configured with one of four ver- 
I sions of control PCBs: PCTUl , PCTU2, PCTU3, or 
PCTUSI. The PCTUl, 2, and 3 have the same 
configuration capacity and can be used in all three 
system models. The PCTUI provides Release 1 
I features; the PCTU2 provides Release 2 features; 
and the PCTU3 provides Release 3 features. The 
PCTUSl provides Release 2features, but has less 
I system capacity than a PCTU (1, 2, or 3). The 
PCTUS is designed to function in DK24 only; if a 
PCTUS is installed in DK56 or DK96, the system 
will not operate correctly. The configuration capaci- 
ties of each PCTU PCB are shown in Table 4-B. 
This table shows the maximum capacities of all the 
options, stations, and lines for each configuration. 
These capacities reflect maximum stand alone 
capacities and do not indicate combined capacity 
of the many possible configurations when mixing 
options, stations, and lines. Use the configuration 
worksheets to determine combined capacities. 
I 1.14 The digital telephone interface unit PCB 
(PDKU) provides an interface for eight digital tele- 
phones. The PDKU also provides interface for the 
PDIU-DI and PDIU-DS data interface units. The 
electronic telephone interface unit PCB (PEKU) 
provides an interface for eight electronic telephone circuits. The standard telephone interface unit PCB 
(PSTU) can accommodate eight standard tele- 
phones or like devices. The standard/electronic 
telephone interface unit PCB (PESU) supports up 
to two standard and four electronic telephones. The 
PESU is intended for configurations that require 
less than three standard telephone ports and/or 
less than five electronic telephone ports, on systems 
that mix standard and electronic telephones. 
1.15 Up to four CO lines can be connected with the 
CO line unit PCB (PCOU). 
1 .16 With the exception of the control PCB which 
has its own dedicated slot, any of these PCBs can 
be used in any of the universal slots (DK24 has six 
universal slots, DK56 has eight, and DK96 has 14). 
Table 4-C shows all the PCBs which can be in- 
stalled in universal slots and the maximum quantity 
of each PCB allowed per system. It is useful to 
consider some examples of system configuration 
as follows: 
Example 1-A small business requires a system to 
handle six CO lines, 12 electronic telephones 
and three standard rotary type telephones. 
l The PCBconfiguration (in addition to Release 
1 or 2 common equipment) is as follows: 
4-2  
						

							0 
Two PCOU PCBs 
Two PEKU PCBs 
One PSTU PCB 
Each of these PCBs requires one universal 
slot, so a total of five slots is required. There- 
fore, a DK24 can be used. 
Example 2-A bank branch office needs nine CO 
I lines, seven electronic telephones, five digital 
telephones, and 11 standard rotary type tele- 
phones. 
l The PCB configuration (in addition to Release 
3 common equipment) is as follows: 
Three PCOU PCBs 
One PEKU PCB 
I One PDKU PCB 
Two PSTU PCBs 
l The configuration requires seven universal 
slots; therefore, DK24 is ruled out, because 
it has only six universal slots. Offering 14 
universal slots, DK96 could be used, but it is 
a little too big for the office’s needs at the 
moment. DK56, with its eight universal slots, 
could meet those needs immediately. Also, 
DK56 could accomodate some expansion of 
lines or stations in this case, since there 
would be one empty universal slot. 
Example 3-A large travel agency needs 18 CO 
I lines, 14 electronic telephones, 14 digital tele- 
phones, nine standard DTMF telephones and 
one FAX machine, all connected to one system. 
l Since DTMF is required, an additional 
subassembly (CRCU) is needed to translate 
DTMF to signals that STRATA DK can un- 
derstand. The CRCU is a subassembly that 
mounts on the common control PCB (PCTU), 
which is part of the STRATA DK common 
equipment. The PCTU has its own dedicated 
slot in the KSU separate from the available 
universal slots. In summary, an additional 
subassembly (CRCU) is required for DTMF 
but the maximum number of universal slots 
remains at six for DK24, eight for DK56, and 
14 for DK96. Lastly, a FAX machine is treated 
like a standard telephone and can use DTMF 
dialing, since the capability exists in the 
system because of the standard DTMF tele- 
phones. 
l The PCB configuration (in addition to com- 
0 
2.01 INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY 1991 
mon equipment) is as follows: 
Five PCOU PCBs 
. 
Two PEKU PCBs 
Two PDKU PCBs 
I 
One PSTU PCB 
One PESU PCB 
One CRCU subassembly 
Each of these PCBs, except for the CRCU, 
requires one universal slot. Therefore, a total 
of 11 slots are required. This is beyond the 
capacity of DK24 and DK56 (six and eight 
slots, respectively) but well within DK96’s 
capacity. 
2 OPTION INTERFACING 
Numerous options, such as a paging ampli- 
fier, external page interface (one zone), relay con- 
trol, etc., require an additional PC6 called the 
PEPU. If even more options are required, such as 
multi-zone paging, alarm sensor, SMDR or remote 
maintenance, then the PIOU or a PIOUS PCB 
would be needed. Table 4-D provides more details 
about the capabilities of these PCBs. Only one of 
these PCBs would be needed in a STRATA DK 
system because the PIOU can do everything the 
PEPU or PIOUS can do and more. If any of these 
options are required, one universal slot is needed 
to accommodate the appropriate PCB, thereby 
reducing the maximum CO line/station capabilities 
by eight station ports or four CO lines. Only one 
option PCB is allowed per DK system. 
2.10 DDSS and DSS Consoles 
2.11 Up to four DSS consoles can be accomodated 
by DK24, DK56, or DK96 equipped with a PCTUI 
or 2 (PCTUl or 2 does not support DDSS con- 
soles). Up to four DDSS consoles, or up to four DSS 
consoles, or any combination up to four can be 
accommodated by a DK24, DK56, or DK96 
equipped with a PCTU3. A DK24 equipped with a 
PCTUSl can support up to three DSS consoles 
only (PCTUSl cannot support DDSS consoles). In 
addition, the application of DDSS consoles is flex- 
ible so that one to four DDSS consoles can be 
assigned to one digital or electronic telephone, or 
one DDSS console to each of four digital or elec- 
tronic telephones, or any intermediate combination 
(this also applies to DSS consoles and electronic 
4-3  
						

							INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY1991 
telephones). Each DDSS console does not require 
a specialized interface PCB; instead, each DDSS 
console takes the place of one digital telephone on 
a PDKU PCB. However, only one DDSS console 
may be interfaced to a PDKU, and it must interface 
to circuit 8. Likewise, each DSS console does not 
require a specialized interface PCB; instead, each 
DSS console takes the place of two electronic 
telephones on a PEKU PCB. However, only one 
DSS console may be interfaced to a PEKU, and it 
must interface to circuits 7 and 8. Table 4-E pro- 
vides more details regarding DDSS and DSS con- 
soles. 
Example 4-An end user requires nine CO lines, 
15 electronic telephones, one DSS console and 
external paging. 
l If external paging speakers can be driven 
with 3 watts or less, then the PEPU PCB can 
be employed as the paging amplifier. Since 
each DSS console requires the equivalent of 
two electronic telephones for interface, a 
total of 17 equivalent electronic telephones 
must be interfaced and, therefore, three 
PEKU PCBs are needed. Aside from com- 
mon equipment, the PCBs required for this 
configuration are as follows: 
Three PCOU PCBs 
Three PEKU PCBs 
One PEPU PCB 
l A total of seven universal slots are needed 
(which is within the maximum of DK56’s eight 
universal slots). 
Example 5-A mid-sized business needs 15 CO 
1 lines, 12 digital telephones, two DDSS consoles, 
14 electronic telephones, two DSS consoles, 
external paging system interface to drive an 
existing 8-ohm speaker, and SMDR. 
l Because SMDR is a requirement, the PIOU 
amplified page output and SMDR interface 
will be needed. This unit can also handle the 
external paging system interface require- 
ment. Two DDSS consoles require the 
equivalent of two digital telephone circuits in 
addition to the 12 digital telephones, for a 
total of 14 digital telephone circuits; this 
results in the installation of two PDKU PCBs. 
Two DSS consoles require the equivalent of 
four electronic telephones, for a total of 18 
electronic telephone circuits; this results in the installation of three PEKU PCBs. The - 
final PCB configuration (in addition to corn- .j 
mon equipment) is: 
Four PCOU PCBs 
Three PEKU PCBs 
Two PDKU PCBs 
I 
One PIOU PCB 
l The total universal slots needed equals 10, 
so that a DK96 would be sold to this busi- 
ness. 
2.20 Data Interface Units (PDIU-DI and PDIU-DS) 
2.21 Integrated Data Interface Unit (PDIU-DI): 
Digital telephones may be equipped with a PDIU- 
DI. The PDIU-DI is not astand-alone unit, and must 
be attached to a digital telephone. Each system can 
support amaximum numberof PDIU-Dls, asshown 
in Table 4-B. The PDIU-DI and the digital telephone 
it is integrated into share the same circuit on the 
PDKU PCB. 
2.22 Stand-alone Data Interface Unit (PDIU-DS): 
Each PDIU-DS requires one circuit on a PDKU 
PCB. A PDIU-DS can be connected to any circuit 
on a PDKU, and as many as eight can be con- 
nected to a PDKU. Unlike the PDIU-DI, the PDIU- 
DS does not share a circuit with a digital telephone. 
Therefore, each PDIU-DS reduces the digital tele- 
phone maximum capacity by one. Each system can 
suppot-tamaximumnumberofPDIU-DSs,asshown 
in Table 4-B. 
NOTE: 
1. The PDIU-DI and PDIU-DS will function 
with all slots, except slots 11 - 14 in DK96. 
2. PDKU circuits 1 - 7 can support PDIU-Dls 
and PDIU-DSs. 
Example 6-A small law firm requires three CO 
lines, IO digital telephones (all of which will be 
equipped with a PDIU-DI connected to a per- 
sonal computer) and two PDIU-DSs connected 
to modems. 
l The telephones will require IO PDKU circuits 
and the modem/PDIU-DSs two more. The 
PDIU-Dls do not require a dedicated circuit, 
because they share one with the digital tele- 
phones to which they are connected. A total 
of 12 digital circuits are required for this 
configuration; therefore, two PDKUs would 
4-4  
						

							INSTALLATION-CONFIGURATION 
SECTION 200-096-204 
FEBRUARY1991 
be needed. The three CO linescan be handled 
by one PCOU PCB. 
The two modems are configured in a system 
modem pool and if no dedicated CO lines are 
provided, then one standard telephone 
(PSTWPESU) station port is required for 
each; therefore a PESU or PSTU would be 
needed. The PCBs required for this configu- 
ration are as follows: 
Two PDKUs 
One PCOU 
One PESU or PSTU 
A total of four universal stations needed. 
A DK24 would suffice for this configura- 
tion. 
Example ~-TWO tenants in one building require, 
on a combined basis, 13 CO lines, 23 electronic 
telephones, eight standard DTMF telephones, a 
FAX machine, four DSS consoles, remote main- 
tenance, and an interface to their alarm system. 
l The PIOUS PCB can provide remote mainte- 
nance for their telephone system and also act 
as an alarm sensor to alert employees through 
electronictelephones. An IMDU subassembly 
on the PIOUS fulfills the need of a modem for 
remote maintenance, but does not deduct 
from the universal slot count. The four DSS 
consoles need to be interfaced as eight elec- 
tronic telephones in addition to the 23 elec- 
tronic telephones (resulting in a total of 31 
equivalent electronic telephones). Therefore, 
a total of four PEKU PCBs would be installed, 
which would each have a DSS console con- 
nected. One FAX machine in addition to eight 
standard telephones means that one PSTU 
and one PESU PCB are needed. Because 
DTMF is coming into the system, a CRCU 
needs to be installed, but does notdeductfrom 
the universal slots available. The total PCB 
requirement (in addition to common equip- 
ment) is as follows: 
Four PCOU PCBs 
Four PEKU PCBs 
One PSTU PCB 
One PESU PCB 
One PIOUS PCB 
One IMDU subassembly 
One CRCU subassembly 
l A total of 11 universal slots are required, so a STRATA DK96 can fill the bill. 
2.30 Door Phones 
2.31 Up to 12 door phones (MDFB) can be accom- 
modated by either a DK24, DK56, or a DK96 
equipped with a PCTU (1,2, or 3). However, DK24 
equipped with PCTUSI can support only nine door 
phones. A door phone control (HDCB) interface 
unit is required for every three door phones. Each 
HDCB is interfaced to a STRATA DKsystem via the 
PEKU or PESU PCB, and must occupy circuit 5 on 
either PCB. For system configuration, each HDCB 
must be considered equivalent to an electronic 
telephone as far as consuming station capacity. 
Table 4-E provides more details regarding HDCB 
configuration. 
2.40 E & M TIE Lines 
2.41 Each PEMU PCB provides interface to four 
TIE lines. Up to four TIE lines can be accommo- 
dated by DK24, up to eight by DK56, and up to 
twelve by DK96. TIE lines (PEMU) are the same as 
CO lines (PCOU), when considering the maximum 
total outside lines in a system. The maximum lines 
per system are 16 for DK24,24 for DK56, and 36 for 
DK96. In addition, each PEMU uses up station 
ports so that the software-limited station capacity of 
a system is reduced with every PEMU added. The 
number of station ports consumed by the PEMU 
depends on the type of PCTU used. If a PCTU (1, 
2, or 3) is installed, the PEMU reduces the system 
station capacity by four. If a PCTUSI is installed, 
each PEMU reduces the station capacity by eight. 
This is of concern only in a DK24 system that 
requires more than 16 stations. Each PEMU added 
to a system uses up one universal slot. 
NOTE: 
DK24’s limit of four TIE lines (one PEMU) is 
due to power supply capacity. Do not exceed 
this limit. 
2.50 Off-hook Call Announce 
2.51 If upgraded, each digital and electronic tele- 
phone can receive off-hook call announce (OCA) 
calls. In addition, PEKU PCBs supporting elec- 
4-5