Vodavi Starplus Hybrid Key Telephone System Installation Manual

							B. Expansion KSU with Power Supply (EKSU) 
The SPD 1428 Expansion KSU is a unit which comes 
equipped with a power supply and circuity providing 
four (4) additional loop start CO/PBWCentrex line 
ports and eight (8) digital station ports to the Basic 
KSU. All processing and control functions as well as 
voice connections and switching are controlled by 
circuitry on the Basic KSU and transmitted to the 
Expansion KSU through the ribbon cables. 
The Expansion key service board allows connection 
of one optional application. module (i.e. DTMF Re- 
ceiver) to the system and connector(s) for installing 
an additional SPD 1428 2X4 Expander Module or the 
SPD 1428 4X8 Expander Module. Refer to Figure 
500-4 for an expansion key service board (PCB) 
layout and location of connectors. 
Power Sum 
The power supply, installed in the Expansion KSU at 
the time of manufacture, has an input voltage of 117 
VAC 510%. The power supply provides power, a 
filtered / unregulated +12 VDC, to the Expansion key 
service board. A slo-blow 1.5 amp fuse on the AC 
side of the transformer provides the necessary fire 
and overload protection. Power is regulated and 
distributed to stations / circuitry in the system on the 
Expansion key service board. The power supply and 
cabinet meet all safety requirements to comply with 
UL 1459 Second Edition and CSA 0.3 standards. 
, s & Indicators 
Four green LED’s are located on the expansion key 
station board. Two of the LED’s (DS2 & DS3) indi- 
cate the presence of +5 & -5 volts. LED’s DSl and 
DS5 indicate the presence of +12 VDC used to 
supply power to the key stations (one LED for every 
four stations). An extinguished LED indicates the 
absences of the associated voltage. 
ExDansion KSU Mountina: 
The SPD 1428 Expansion KSU (EKSU) is housed in 
a wall mountable cabinet which contains the Expan- 
sion Key Service board (EKSB), Power Supply and 
pre-wired connectors for station and CO Line inter- 
faces. The Expansion KSU is mounted directly to the 
right of the Basic KSU and connects via two (2) 
ribbon type cables provided with the unit. Once the 
area for the telephone equipment has been selected, 
mount a plywood back board to the wall. The back 
board size will vary depending upon the size of the 
MDF. The entire system and frame can be mounted 
on a 4’ x 8’ x 3/4” plywood. If mounting the KSU 
alone, the minimum back board size is 25” x 17” x 
3/4”. A fully loaded KSU can weigh approximately 
15 Ibs. Make certain proper mounting procedures 
are followed.  Digital Key Telephone Systems 
sTARPLUS@ SPD 1428 812866 
NOTE: Check local building and electrical codes 
before mounting the system. For example, certain 
areas may require a flame retardant plywood back 
board. 
Mount the cabinet to the plywood using 3/4” #12 
pan-head sheet metal screws such that the top of the 
KSU is approximately three feet (1 meter) from the 
ceiling, and bottom is four feet (1.2 meters) from the 
floor. 
Use the mounting template supplied with the cabinet 
to locate the mounting holes. Refer to Figure 500-2. 
Drill the holes and mount the KSU. 
A No. 12 AWG copper wire should be used to 
connect a ground between the Basic KSU and the 
Expansion KSU. A two position terminal strip (P3) 
is located along the bottom edge of the main key 
service unit and is accessible through the bottom of 
the BKSU. A similar two position terminal strip (P3) 
is located along the bottom edge of the expansion 
key service board and is accessible through the 
bottom of the EKSU. One terminal position on each 
P3 connector can be used to connect the ground 
wire from the basic KSU to the Expansion KSU. 
CO Line/Station interfaces: 
The EKSU contains the necessary circuitry to con- 
nect an additional four (4) CO/Centrex/PBX loop 
start lines and eight (8) Digital Key Telephones to the 
system. This card also contains one additional voice 
(transmit) path for external paging. 
The Expansion key station board contains four (4) 
Central Office, Centrex or PBX loop start, line inter- 
faces. The protection circuitry to allow the system to 
be classified as a fully protected system are located 
on the card for each CO circuit. The CO circuits are 
equipped with current sensing circuitry that identifies 
distant end disconnect (loop supervision). Each CO 
line interface design also provides proper fusing or 
protection to comply with the requirements of UL 
1459 Second Edition and CSA 0.3 standards. CO 
lines are connected to the system via RJ-11 modular 
jacks mounted on the bottom of the Expansion key 
service board. 
The Expansion key station board also provides the 
interface for eight (8) Digital Key Telephones using 
two (2) 64 kilobyte channel arrangements. Stations 
connect to the board via the MDF through a 50 pin 
connector located inside the KSU. Each station 
connection requires four (4) wires to connect to the 
board. 
A Digital DSS/DLS Console, and a Single Line Tele- 
phone Adapter (OPX) or other specifically designed 
adapter with a digital interface can be assigned to 
any one of the interface circuits. The Key Station 
500-8 Issue 1, November 1881  
						

							STARPLUS@ SPD 1428 & 2856 Digital Key Telephone Systems 
_ - - _ _ _ 
.i¶ 
~ 
. _ _ _ _. . ___. 
,-__ 
. . . ..--.-............1 
Figure 500-4 Expansion KSU & Main Key Service Bd (EKSU) 
Issue 1, November 1991 
500-9  
						

							Digital Key Telephone Systems STARPLUS@ SPD 1428 & 2856 
interface circuits are protected from mis-wiring and 
over-current. 
. mes Connections: 
CO Lines are connected to the system via modular 
RJ-11 connectors accessed through the bottom of 
the EKSU. The Expansion KSU connects CO Line 
ports 9,10, 11, and 12 to the system through modu- 
lar connectors Jl , J2, J3, and J4 respectively. The 
pinouts of the modular connector are as follows: 
%!I ITF 
Stations Connections: 
The station ports of the SPD 1428 are wired to the 
main distribution frame via a 25pair, @O-pin) male 
amphenol-type connector located on the expansion 
key service board, connector Jl 1. A 25pair cable 
with a 50-pin Female amphenol-type connector is 
required to extend the station ports to the main 
distribution frame. Refer to Table 500-2 for additional 
pinouts information. 
NOTE: The 25 pair cable used to extend the stations 
to the MDFdoes not have to be shielded. However, 
the 25 pair cable must pass through a 318” diameter 
ferrite core before exiting the KSlJ again to comply 
with FCC Part 15 regulations. 
s 25pair port 
card to MDF 
cable 
External Paaina Connections 
The Expansion KSU is equipped with an external 
page port (a one-way, transmit voice path) that is 
wired to the Jl 1 connector @O-pin male amphenol- 
type connector) on the Violet/Slate, Slate/Violet pair 
of wires (pin’s 50 and 25). Refer to Table 500-2 for 
additional information. 
Awlication Modulefs) Connections: 
The Jl connector on the expansion key service 
board allows the installation of one application mod- 
ule (i.e. DTMF receiver) to the system. Refer to Sec. 
500.6 for a description of the available application 
modules. C. 2x4 CO/STA Expander Module 
The SPD 1428 2x4 CO/STA Expander Module& a 
Two (2) CO by four (4) Key Station Interface module 
that plugs onto the main key service board of the 
basic KSU or the expansion key service unit of the 
Expansion KSU with the use of two ribbon cables. 
This module is a combination board that contains the 
necessary circuitry to connect two (2) CO/Cen- 
trex/PBX loop start lines and four (4) Digital Key 
Telephones to the system. This card also contains 
one additional voice (transmit) path for external pag- 
ing, and a connector for adding one application 
module (i.e. DTMF Receiver) to the system. 
NOTE: When the 2x4 Expander module is installed 
in the Expansion KSU, two CO ports and four Station 
ports become unusable. 
LED’s & Indicators 
Two green LED’s indicate the presence of +5 & -5 
volts dc and a third LED monitors the +12 VDC used 
to supply power to the key stations. An extinguished 
LED indicates the absences of the associated volt- 
age. 
Module Installation: 
a. 
b. 
C. 
d. 
e. 
f. 
g- Remove power from the Basic KSU. 
Locate the J9 connector on the Basic KSU 
motherboard and the Pl connector on the 2x4 
CO/Station Expander Module. Refer to Figure 
500-l 2. 
Gently push the cable from the Pl connector on 
the 2x4 CO/Station Expander Module onto the 
J9 connector on the Basic KSU motherboard. 
Locate the JlO connector on the Basic KSU 
motherboard and the P2 connector on the 2x4 
CO/Station Expander Module. Refer to Figure 
500-l 2. 
Gently push the cable from the P2 connector on 
the 2x4 CO/Station Expander Module onto the 
JlO connector on the Basic KSU motherboard. 
Secure the six (6) screws attached to the 2x4 
CO/Station Expander module to the Basic KSU 
motherboard. 
Restore power to the Basic KSU. 
CO Line/Station Interfaces: 
The 2x4 CO/STA Expander Module provides the 
interface for two (2) Central Office, Centrex or PBX 
loop start, lines. The protection circuitry necessary 
to allow the system to be classified as a fully pro- 
tected system are located on the card for each CO 
circuit. The CO circuits are equipped with current 
sensing circuitry that identifies’distant end discon- 
nect (loop supervision). The module design also 
provides proper fusing or protection to comply with 
the requirements of UL 1459 Second Edition and 
500-l 0 Issue 1, November 1991  
						

							sTARPLUS@ SPD 1428 & 2858 Digital Key Telephone Systems 
Table 500-2 SPD 1428 EKSU Jll Station 
Connections Table 500-3 SPD 1428 4x8 Expander Module 
Connection . 
PAIR PIN COLOR DESIG 
1 26 WH/BL Port 013 Xmt Tip 
1 BUWH Xmt Ring 
2 27 WH/OR Rcve Tip 
2 OR/WH Rcve Ring 
3 28 WWGN Port 014 Xmt Tip 
3 GNIWH Xmt Ring 
4 29 WH/BN Rcve Tip 
4 
BN/WH Rcve Ring 
5 30 WWSL Port 015 Xmt Tip 
5 SUWH Xmt Ring 
6 31 RD/BL Rcve Tip 
6 BURD Rcve Ring 
7 32 RD/OR Port 016 Xmt Tip 
7 
OWRD Xmt Ring 
8 33 RD/GN Rcve Tip 
8 GN/RD Rcve Ring 
9 34 RD/BN Port 017 Xmt Tip 
9 BN/RD Xmt Ring 
10 35 RD/SL Rcve Tip 
10 SURD Rcve Ring 
11 36 BWBL Port 018 Xmt Tip 
11 BUBK Xmt Ring 
12 37 BWOR Rcve Tip 
12 
OR/BK Rcve Ring 
13 38 BWGN Port 019 Xmt Tip 
13 GN/BK Xmt Ring 
14 39 BWBN Rcve Tip 
14 BN/BK Rcve Ring 
15 40 BWSL Port 020 Xmt Tip 
15 SUBK Xmt Ring 
16 41 YUBL Rcve Tip 
16 BUYL Rcve Ring 
17 42 YUOR Port 021* Xmt Tip 
17 OR/YL Xmt Ring 
18 43 YUGN Rcve Tip 
18 GNNL Rcve Ring 
19 44 YUBN Port 022’ Xmt Tip 
19 BNNL Xmt Ring 
20 45 YUSL Rcve Tip 
20 SLiYL Rcve Ring 
21 46 VI/BL Port 023* Xmt Tip 
21 
BWl Xmt Ring 
22 47 VI/OR Rcve Tip 
22 OR/VI Rcve Ring 
23 48 VI/GN Port 024 ‘Xmt Tip 
23 GNNI Xmt Ring 
24 49 VI/BN Rcve Tip 
24 BNNI Rcve Ring 
25 50 VIISL External Page Tip 
25 SWI External Page Ring 
.ctive only when the SPD 1428 2x4 Expander 
Module is installed in the Expansion KSU. PAIR 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 - 
- PIN COLOR 
26 WWBL 
1 BUWH 
27 WWOR 
2 ORiWH 
28 WWGN 
3 GN/WH 
29 WH/BN 
4 BN/WH 
30 WWSL 
5 SVWH 
31 RD/BL 
6 BURD 
32 RD/OR 
7 OR/RD 
33 RD/GN 
8 GN/RD 
34 RD/BN 
9 BN/RD 
35 RD/SL 
10 SURD 
36 BWBL 
11 BUBK 
37 BWOR 
12 OWBK 
36 BWGN 
13 GN/BK 
39 BWBN 
14 BN/BK 
40 BKISL 
15 SUBK 
41 YUBL 
16 BUYL 
42 YUOR 
17 ORIYL 
43 YUGN 
18 GNNL 
44 YUBN 
19 BNNL 
45 YUSL 
20 SUYL 
46 VI/BL 
21 
BWI 
47 VI/OR 
22 OR/VI 
48 VI/GN 
23 GNNI 
49 VI/BN 
24 
BNNI 
50 VIISL 
25 SWI’ - 
- DESIG 
Port 021 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 022 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 023 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 024 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 025 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 026 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 027 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Port 028 Xmt Tip 
Xmt Ring 
Rcve Tip 
Rcve Ring 
Ext Page Tip 
Ext Page Ring 
Issue 1, November 1991 500-l 1  
						

							Digital Key Telephone Systems sTARPLUS@ SPD 1428 & 2858 
CSA 0.3 standards. CO lines are connected to the 
system via RJ-11 modular connectors mounted on 
the bottom edge of the board. 
The 2x4 CO/STA Expander module also provides 
the interface for four (4) Digital Key Telephones 
using two (2) 64 kilobyte channel arrangements. 
Stations connect to the board via the MDF through 
a 50 pin connector located on the main key service 
board inside the basic KSU or a similar connector on 
the expansion key service board when installed in 
the EKSU. Each station connection requires four (4) 
wires to connect to the board. 
A Digital DSWDLS Console, and a Single Line Tele- 
phone Adapter (OPX), or other specifically designed 
4 adapter with a digital interface can be assigned to 
any one of the interface circuits. The Key Station 
interface circuits are protected from mis-wiring and 
over-current. 
CO Lines are connected to the system via modular 
RJ-11 connectors mounted on the 2x4 Expander 
Module and accessed on the bottom of the KSU. 
The 2x4 Expander Module connects CO Line ports 
5 and 6 (when installed on the Basic KSU) or ports 
13 and 14 (when installed in the Expansion KSU) to 
the system through modular connectors J21 and J22 
respectively. The pinouts of the modular connector 
are as follows. 
sy ppF 
RIN 1 
Stations Connections: 
The station ports of the SPD 1428 2x4 Expander 
Module are wired to the main distribution frame via 
a 25pair, @O-pin) male amphenol-type connector 
located on the main key service board or expansion 
key service board, connector Jl 1. A 25-pair cable 
with a 50-pin Female amphenol-type connector is 
required to extend the station ports to the main 
distribution frame. The pinouts for the stations on 
the 2x4 Expander module activate ports 009 through 
012 on connector Jl 1 as shown in Table 500-l 
when installed on the main key service unit in the 
Basic KSU. The pinouts for the stations on the 2x4 
Expander module activate ports 025 through 028 on 
connector Jll are shown in Table 500-2 when in- 
stalled on the expansion key service unit in the 
Expansion KSU. Paaina Connections: 
A two position terminal strip J2 mounted on the 2x4 
Expander board provides connection to the external 
page port (a one-way, transmit voice path) provided 
for on the 2x4 module. 
. . 
9, 
The Jl connector on the 2x4 Expander module 
allows the installation of one application module (i.e. 
DTMF receiver) to the system. Refer to Sec. 500.6 
for a description of the available application mod- 
ules. 
D. 4x8 CO/STA Expander Module 
The SPD 1428 4x8 CO/STA Expander Module is a 
four (4) CO by eight (8) Key Station Interface module 
that may plug onto the Expansion key service board 
of the Expansion KSU only. This module is a com- 
bination board that contains the necessary circuitry 
to connect four (4) COICentrexlPBX loop start lines 
and eight (8) Digital Key Telephones to the system. 
This card also contains one additional voice (trans- 
mit) path for external paging, and a connector for 
adding one application module (i.e. DTMF Receiver) 
to the system. 
LED’s 81 Indicators 
Four green LED’s are located on the 4x8 Expander 
Module. Two of the LED’s (DS2 & DS3) indicate the 
presence of +5 & -5 volts dc. LED’s DSl and DS5 
indicate the presence of +12 VDC used to supply 
power to the key stations (one LED for every four 
stations). An extinguished LED indicates the ab- 
sences of the associated voltage. 
Module Installation: 
a. Remove power from the Expansion KSU. 
b. Locate the J9 connector on the Expansion KSU 
motherboard and the Pl connector on the 4x8 
CO/Station Expander Module. Refer to Figure 
500-l 2. 
c. Gently push the cable from the Pl connector on 
the 4x8 CO/Station Expander Module onto the 
J9 connector on the Expansion KSU mother- 
board. 
d. Locate the JlO connector on the Expansion 
KSU motherboard and the P2 connector on the 
4x8 CO/Station Expander Module. Refer to Fig- 
ure 500-l 2. 
e. Gently push the cable from the P2 connector on 
the 4x8 CO/Station Expander Module onto the 
JlO connector on the Expansion KSU mother- 
board. I 
f. Secure the six (6) screws attached to the 4x8 
CO/Station Expander module to the Expansion 
KSU motherboard. 
500-l 2 Issue 1, November 1991  
						

							g. Restore power to the Expansion KSU. 
A No. 12 AWG stranded wire is used to connect a 
ground between the Expansion KSU and the 4x8 
CO/Station Expander Module. A two position termi- 
nal strip (P3) is located along the bottom edge of the 
expansion key service unit and is accessible through 
the bottom of the BKSU. One terminal position on 
the P3 connector is used to connect the ground wire 
from the basic KSU to the Expansion KSU. 
The other terminal position is used to connect the 
ground wire from the 4x8 CO/Station Expander Mod- 
ule to the Expansion KSU. 
CO Line/Station Interfaces 
The 4x8 CO/STA Expander Module provides the 
interface for four (4) Central Office, Centrex or PBX 
loop start, lines. The protection circuitry necessary 
to allow the system to be classified as a fully pro- 
tected system are located on the card for each CO 
circuit. The CO circuits are equipped with current 
sensing circuitry that identifies distant end discon- 
nect (loop supervision). The module design also 
provides proper fusing or protection to comply with 
the requirements of UL 1459 Second Edition and 
CSA 0.3 standards. CO lines are connected to the 
system via RJll modular connectors mounted on 
the bottom edge of the board. 
The 4x8 CO/STA Expander module also provides 
the interface for eight (8) Digital Key Telephones 
using two (2) 64 kilobyte channel arrangements. 
Stations connect to the board via the MDF through 
a 50 pin connector located on the board. Each 
station connection requires four (4) wires to connect 
to the board. 
A Digital DSS/DLS Console, and a Single Line Tele- 
phone Adapter (OPX) or other specifically designed 
adapter with a digital interface can be assigned to 
any one of the interface circuits. The Key Station 
interface circuits are protected from mis-wiring and 
over-current. 
. 
s Connections. 
CO Lines are connected to the system via modular 
RJ-11 connectors accessed through the bottom of 
the EKSU. The 4x8 Expander Module connects CO 
Line ports 13, 14, 15, and 16 to the system through 
modular connectors Jl , J2, J3, and J4 respectively. 
The pinouts of the modular connector are as follows: . . Irma / Pmouts / Connections - Stations 
The station ports of the SPD 1428 4x8 Expander 
Module are wired to the main distribution frame via 
a 25pair, @O-pin) male amphenol type connector 
located on the 4x8 Expander module, connector Jl 1. 
A 25-pair cable with a 50-pin Female amphenol-type 
connector is required to extend the station ports to 
the main distribution frame. The pinouts are shown 
in Table 500-3. 
NOTE: The 25pair cable used to extend the stations 
to the MDFdoes not have to be shielded. However, 
the 25 pair cable must pass through a 3/8” diameter 
ferrite core before exiting the KSU again to comply 
with FCC Part 75 regulations. 
I 25-pair port 
card to MDF 
cable 
. 
nal Pv 
The 4x8 Expander Module is equipped with an ex- 
ternal page port (a one-way, transmit voice path) that 
is wired to the Jll connector (50-pin male amphe- 
nol-type connector) on the Violet/Slate, Slate/Violet 
pair of wires (pin’s 50 and 25). Refer to Table 500-3 
for wiring information. 
- . 
Con- 
The Ji connector on the expansion key service 
board allows the installation of one application mod- 
ule (i.e. DTMF receiver) to the system. Refer to Sec. 
500.6 for a description of the available application 
modules. 
Issue 1, November 1991 500-13  
						

							500.4 SPD 2656 INSTALLATION PLANNING 
Prior planning of the installation will aid in a smooth 
cut-over and a satisfied customer. Select a suitable 
location for the system. Determine the number of 
telephones of each type, and the number of 4x8 
CO/Station cards from the sales contract and discus- 
sions with the customer. 
NOTE: Only one station set is allowed per digital 
extension number. It is not possible to bridge digital 
station ports so that an extension number may ap- 
pear in more than one location. 
. 
4 
. 
e 
. 
. Programming information should also be gath- 
ered from the customer at this time so that the 
system may be programmed either before, or 
while the system is being installed. I_ 
Determine the location and type of each tele- 
phone, and mark floor plans accordingly. 
Determine the location for the operator stations, 
and mark the floor plans. 
Arrange for power cabling (if necessary) and 
station cabling of the site. 
If the system is to be installed in an area subject 
to frequent lightning storms, consideration 
should be given to providing additional lightning 
protection on the CO lines beyond what is 
provided by the local telephone operating com- 
pany. 
NOTE: Installers should be trained and thoroughly 
familiar with the basic components of the SPD 2856 
before attempting installation of this product, 
500.5 
SPD 2656 SYSTEM COMPONENTS 
A. Equipment Cabinet With Power Supply 
WW 
The SPD 2856 system main cabinet contains the 
power supply and mother board to support a fully 
configured system of 28 CO Lines and 56 Stations. 
The mother board has eight (8) card slots. Card Slot 
J8 (the right most card slot) is used for the Central 
Processor Board (CPB) PCB. Card slots Jl through 
J7 each support a four (4) CO line by eight (8) station 
PCB’s. Cable exits through the bottom of the KSU 
through a cable exit raceway near the back of the 
KSU. Refer to Figure 500-5 for PCB layout and 
location of connectors. 
Power Sup& 
The power supply is installed in the KSU at the time 
of manufacture and ships with the KSU. The power 
supply input voltage is 117 VAC flO%. The power 
supply provides power distribution of filtered / un- 
regulated 12 VDC and a regulated -5 VDC to the 
backplane bus. An ON/OFF switch is located on the front of the power supply along with a slo-blow 5 amp 
fuse on the AC side of the transformer. The power 
supply provides an input for a 48 VDC source for 
future use. Power is regulated and distributed to 
stations/circuitry in the system on each PCB. Three 
fuses located inside the power supply protect the 
system from over-current situations. The power 
supply and cabinet meet all safety requirements to 
comply with UL 1459 Second Edition and CSA 0.3 
standards. 
The power supply is installed inside the system 
cabinet, on the right side, in the first card slot (J9). 
The power supply is designed to be an integral, 
structural part of the system. Do not attempt to install 
the system, or interface cards unless the power 
supply is installed with all four screws securely in 
place. The cabinet, includes the power supply al- 
ready installed. The power supply is recognized 
under the Component Program of Underwriters 
Laboratories Inc. 
NOTE: Make certain a l/2 inch diameter ferrite core 
is in place on the power cord at a point as close to 
the power supply as possible. If this core is not in 
place, it is shipped with the cabinet and must be 
installed before operating the system. Refer to fig- 
ure 500-6 for the proper location. Keep the ferrite 
core from sliding down the cable by installing a cab/e 
tie on the power cordjust below the ferrite cord. 
The power supply is unique in that the transformer 
is not present on the power supply card and its 
enclosure. The transformer is mounted inside the 
cabinet next to the bottom right of the backplane. 
When the power supply card is installed, the trans- 
former is totally enclosed by the power supply card’s 
“L” shaped enclosure, and the right side of the cabi- 
net. This creates a totally enclosed, operational, 
power supply. Since the transformer is installed in 
the cabinet, and the power supply card is removable 
from the cabinet, the AC connections are made 
directly to the system backplane. 
1 WARNING 1 
Since hazardous voltages are always pre- 
sent on the backplane while the system 
AC power cord is plugged in, AT NO TIME 
SHOULD THE POWER SUPPLY CARD 
BE REMOVED WHILE THE SYSTEM AC 
POWER CORD IS PLUGGED IN. THE 
POWER SUPPLY BOARD AND ITS “L 
SHAPED METAL ENCLOSURE PRO- 
VIDE THE ONLY PROTECTION FROM 
SHOCK HAZARD WHILE THE AC 
POWER CORD IS PLUGGED IN. There 
are very few instances when the power 
500-l 4 Issue 1, November 1991  
						

							sTARPLUS@ SPD 1428 & 2856 Digital Key Telephone Systems 
GND 
Figure 500-5 SPD 2856 Basic Cabinet with Power Supply 
Issue 1, November 1991 500-15  
						

							Digital Key Telephone Systems STARPLUS@ SPD 1428 & 2858 
supply card should be removed. If an 
instance arises where it must be removed, 
ALWAYS unplug the system AC power 
cord FIRST. 
The power supply cord plugs into an isolated, dedi- 
cated, (with dedicated ground) 117VAC outlet for 
power. This is necessary to prevent possible voltage 
spikes and transients that may be caused by equip- 
ment sharing the same AC circuit. 
The AC connection to the power supply requires a 
parallel blade with a ground receptacle. A three wire 
to two wire isolation adapter should not be used. The 
use of a surge suppressor is required. 
. 
Grounding 
A no. 12 AGW copper wire should be used to con- 
nect a ground between the ground source and the 
KSU (25 feet maximum). A two position terminal 
strip (JlO) is located on the lower left comer of the 
mother board and is accessible through the left side 
of the KSU. One terminal position can be used to 
connect the ground wire from a ground source. 
I 
- 
- 
GND 4 
18” 
B. Cabinet Installation 
Once the area for the telephone equipment has been 
selected, mount a plywood back board to the wall. 
The back board size will vary depending upon the 
size of the MDF. The entire system and frame can 
be mounted on a 4’ x 6’ x 3/4” plywood. If mounting 
the cabinet alone, the minimum back board size is 
25” x 17” x 3/4”. A fully loaded cabinet can weigh 
approximately 64 Ibs. Make certain proper mounting 
procedures are followed. 
NOTE: Check local building and electrical codes 
before mounting the system. For example, certain 
areas may require a flame retardant plywood back 
board. 
Mount the cabinet to the plywood using 3/4” #12 
pan-head sheet metal screws such that the top of the 
cabinet is approximately three feet (1 meter) from the 
ceiling, and bottom is four feet (1.2 meters) from the 
floor. Make certain before mounting the cabinet that 
circuit cards slide easily in and out of their respective 
card slots. 
Use the mounting template supplied with the cabinet 
to locate the mounting holes. Also refer to Figure 
500-6. Drill the holes and mount the cabinet. 
- - - - 
w 
w bu !rd vd w w w Poww supply 
UWU~~ Jl 52 J3 54 55 56 57 
d 
J6 
6 
: 
0 - 
PUS-E 1 
n 
/ 
Make certain a l/2 
/ inch diameter ferrite 
core is installed on 
the power cord 
here. 
/’ / Install a cable tie 
here to keep the 
ferrite core from 
sliding down the 
cable. 
/ I I 
I I II 
r iig 
117VAC 
Split ferrite cores 
Figure 500-6 SPD 2856 Mounting Dimensions 
500-l 6 Issue 1, November 1891  
						

							STARPLUS@ SPD 1428 & 2856 
Digital Key Telephone Systems 
C. Central Processor Board (CPB) 
This plug-in card is the only common equipment card 
required to make the system operational and con- 
trols all system activity. The CPB contains the main 
micro-processor a 16-bit (68000) and a real time 
clock which controls all system functions including 
the PCM/TDM voice switching under direction of 
ROM and RAM software coding. The CPB is re- 
sponsible for all control functions, execution of all 
logic operations and control of system modules in- 
cluding control over circuitry necessary for voice 
switching and conference connections. The CPB is 
also responsible for all system tones, system timing, 
and station status control. In addition the CPB also 
provides software and hardware support to ensure 
the following: 
Watch dog timer and recovery. 
PCB status as to presence/absence of cards 
for automatic software configuration setup. 
Interpret an ID code from each PCB so that 
card type can be determined automatically. 
State/event software design. 
Battery backup of customer database RAM 
memory. 
The CPB contains the circuitry and connection (RCA 
type) for background music/music on hold, and the 
standard 300 Baud Modem. An optional 1200 Baud 
Modem can be installed on the CPB to allow the 
on-board modem to transmit at a 1200 baud rate. In 
addition there is one RS-232 (modular connector) 
input/output port on the CPB and a connector to 
support the use of an optional I/O expansion module. 
The I/O expansion module adds (1) RS-232 l/O port 
and (1) RS-422 l/O port to the system for a system 
total of three (3) I/O ports. A reset (halt) push button 
switch and a BGM/MOH volume control pot is lo- 
cated on the front of the PCB. Refer to Figure 500-5 
for CPB layout and location of connectors. 
System software is provided in EPROM memory and 
is installed on the CPB. The CPB contains (512) 
kilobytes of EPROM storage and is equipped with 
256K of battery-backed static RAM. Provisions 
have been made on the card to address up to (4) 
megabytes of EPROM memory and up to (2) mega- 
bytes of static RAM. 
An option “dip” switch located on the CPB allows the 
system EPROM memory to be configured utilizing 
different size EPROM chips. 1 Megabit, 2 Megabit, 
4 Megabit and 8 Megabit chips may be used to 
provide the generic software.Refer to Sec. 800 Main- 
tenance & Troubleshooting for “dip” switch settings 
for various allowable configurations. 
The CPB allows the use of either 1 Megabit or 4 megabit static RAM chips to be used for RAM mem- 
ory. The size and type of memory usedjs automat- 
ically determined and set by the system. 
The battery backup strap must be placed 
in the “ON” position to activate memory 
battery backup (J3). Do this prior to insert- 
ing the CPB into the KSU (Refer to Figure 
500-5). If the optional 1200 baud modem 
module or expansion I/O module are to be 
installed, do this now prior to inserting the 
CPB. The CPB board is inserted into the 
J8 slot with components on the card facing 
the right. This board must NOT be in- 
stalled with the power on. The edge con- 
nector on the CPB is offset to prevent it 
from being installed in an incorrect slot. 
Do not force the card into another slot. 
One CPB is required per system. 
LED’s 81 Indicators 
Two green LED’s located along the front edge of the 
CPB provide an indication of the presence of +5 VDC 
& -5 VDC to the PCB. A third red LED located just 
below the two green LED’s provides a system “heart 
beat” indication. 
Modem Interface 
The CPB contains an on-board modem that is capa- 
ble of transmitting data at a rate of 300 baud. The 
modem supports and is compatible with the Hayes 
command protocol. The Bell System (Western Elec- 
tric) standards 103 and 212A for modem design is 
incorporated into the design of this modem. The 
modem operates on-line in both Full and Half duplex 
modes. An optional 1200 baud module may be 
added to the CPB to allow transmission at the rate 
of 1200 baud. 
VO Port(s) Connections: 
The SPD 2856 CPB contains one RS232C, I/O port 
(8 pin modular jack type connector) located near the 
front edge of the PCB. This I/O port is capable of 
transmitting and receiving data at 300, 1200, 2400, 
4800, and 9600 baud rates. The pinouts and com- 
munication requirements are shown in Figure 500-8. 
Issue 1, November 1991 500-l 7