Vodavi Starplus 2448ex Hybrid Key Telephone System Installation Manual

							300.86 STORING SYSTEM SPEED NUMBERS 
System Speed numbers must be entered by the first 
programmed attendant. If no attendant is specified, 
they are entered at Station 10. 
A. Press SPD twice. 
B. Dial the system speed bin location: 
20 to 99 for System Speed numbers. 
C. Dial telephone number. (including special 
codes described below) 
D. Press the SPD button. 
E. Hang up. 
OR 
F. Press SPD once. 
G. Select desired outside line or group of lines. 
H. Dial the speed bin location: 
20 to 99 for System Speed numbers. 
I. Dial telephones number. (including special 
codes described below) 
J. Press the SPD button. 
K. Hang up. 
- TRANS - Pressing the TRANS button dur- 
ing number entry initiates a Pulse-To-Tone 
switchover. 
- HOLD - Pressing the HOLD button during 
number entry inserts a Pause. 
- FLASH - Pressing the FLASH key inserts a 
Flash into the speed number. 
- TRANS - Pressing the TRANS button as 
the first entry in the speed bin inserts a 
no-display character causing the numbers 
stored in the bin not to appear on the Key 
Telephones display when the bin is ac- 
cessed. 
To program several speed numbers in a row, press 
SPD button twice to conclude programming a num- 
ber and then just enter the next speed number bin to 
be programmed. If the station has no line appear- 
ance for the line programmed into the speed bin, that 
line will come up under the Loop button or Pool 
button when accessed. 
Speed Bin numbers 60-99 are NOT monitored by 
Toll Restriction. 
STARPLUS@ 2448EX 
Hybrid Key Telephone System 
FEATU REs 
The attendant console may be programmed in one 
of three different ways. Therefore, you may not have 
all of the features listed below on your console. Refer 
to Sec. 200.126 for a description of each map. 
300.87 AlTENDANT TRANSFER SEARCH 
m When attempting to locate a party: 
A. Press a station button to signal that station. If 
the party is not located, press another station 
button to continue the search. 
300.88 PLACING AN OUTSIDE CALL (Auto- 
matic Line Selection) 
A. Press outside line button. ON/OFF button LED 
will light and dial tone will be heard. 
B. Dial desired party. 
C. When called party answers, lift handset to con- 
verse or use speakerphone 
300.89 CALL PARK 
n While connected to an outside line: 
A. Press pre-programmed CALL PARK button. 
The caller is put on Exclusive hold. 
B. At this time, you can page or call another inter- 
nal station. 
C. When the party you called responds, announce 
the call park location and replace handset. 
11 Retrieving a Parked Call: 
A. Lift handset or press ON/OFF button. 
B. Dial a pound [#] on the dial pad. 
C. Dial the parking location (790 to 795) where the 
call was parked. 
300.90 DO NOT DISTURB INDICATION 
The associated station button will flash at a medium 
rate to indicate that station is in Do Not Disturb. 
300.91 CALL TRANSFER 
Outside lines can be transferred from one phone to 
another within the system. 
The transfer can be either screened (announced) or 
unscreened to either an idle or busy station. 
A. Screened Transfer 
n While connected to an outside line: 
1. Press the station button where call is to be 
transferred (if programmed on your telephone), 
or press TRANS button and dial the two-digit 
station number (1 O-57). 
2. The called extension signals according to the 
intercom signal switch position. 
3. When that extension answers, announce the. 
transfer. 
Issue 3, March 1992 300-17  
						

							Hybrid Key Telephone System sTARPLUS@ 2448EX 
4. Hang up to complete transfer. 
B. Unscreened Transfer 
When the called extension begins to signal, hang up 
to transfer the call (Recall timer starts). 
C. Transfer Search 
n When attempting to locate a party: 
1. 
2. 
3. 
4. Press a station button to signal a station. 
If the party is not located, press another station 
button to continue the search, 
OR 
Press the TRAN button and dial the two-digit 
station number. 
If the party is not located, press the TRANS 
button again and dial another station number to 
continue the search. 
When the called party answers, hang up to 
complete the transfer. 
300.92 CAMP-ON 
n While connected to an outside line: 
A. Press desired station button. 
B. When busy tone is heard, press CAMP-ON 
button. 
C. Replace handset, access another CO Line or 
press RELEASE button (if you have one). 
300.93 FLEXIBLE BUTTON PROGRAMMING 
A. Press the SPD button twice. 
B. Press the FLEX button to be programmed (it 
must be programmed in data base as a flexible 
button). 
C. Dial the desired code (Refer to Table 300-2 
Button Programming Codes). 
300.94 MEET ME PAGE 
a To request another party meet you on a page: 
A. Dial the desired two-digit paging code or press 
pre-programmed* flex button. 
B. Request that party meet you on the page. 
C. Do not hang up; wait for the requested party to 
answer. 
a Answering a Meet Me Page 
Go to the nearest telephone and: 
A. Dial [‘9] on the dial pad. 
B. You will be connected to the party that paged 
you. 300.95 PAGING 
A. 
1. 
2. 
3. 
B. External Paging 
Press the pre-programmed* PAGE’ button or 
dial r6] on the dial pad. 
Speak in normal tone of voice to deliver mes- 
sage. 
Replace the handset to terminate page an- 
nouncement. 
Internal Paging 
Stations off-hook or in DND will not receive the page 
announcement. 
1. 
2. 
3. 
C. 
1. 
2. 
3. Press the pre-programmed* PAGE button or 
dial one of the following codes: 
l 1 = Internal Zone 1 
l 
2 = 
Internal Zone 2 
l 3 = 
Internal Zone 3 
l 4 s 
Internal Zone 4 
‘5 =: 
Internal All Call 
Speak in normal tone of voice to deliver mes- 
sage. 
Replace the handset to terminate page an- 
nouncement. 
All Call Paging (Internal/External) 
Press the pre-programmed* PAGE button or 
dial [‘O] on the dial pad. 
Speak in normal tone of voice to deliver mes- 
sage. 
Replace the handset to terminate page an- 
nouncement. 
300.96 RELEASE BUlTON 
DSS/DLS maps 1 and 3 contain a Release button 
that may be pressed to disconnect or terminate an 
intercom call, transfer sequence, page an- 
nouncement or CO call. 
300-l 8 Issue 3, March 1992  
						

							SECTION 400 
SYSTEM DESCRIPTION AND SPEClFlCATlOiS 
400.1 SYSTEM TECHNOLOGY 
The Starplus 2448EX Hybrid Key Telephone System 
is an expandable modular system engineered for 
growth through modular card (PCB) expansion pro- 
vides a flexible assortment of features through soft- 
ware options and optional circuit cards. Figure 
200-l 
is a block diagram of the 2448EX System. 
The Starplus Hybrid Key Telephone Systems are the 
upper end of a family of Electronic Key Telephone 
Systems designed to meet the needs of telephone 
users from small to large. The other smaller mem- 
bers of this family are the Starplus 308EX, 616EX, 
and Starplus 616 FLEX Key Telephone System (flat 
pack), the 1224 Key Telephone System (flat pack). 
A larger Starplus SPX, PBX allows customers to 
migrate to an even larger system keeping the same 
instrument on the desk. 
The Starplus Hybrid Key Telephone Systems are 
modular systems designed for growth using state of 
the an Digital Technology for switching control, com- 
mand processing and also utilizes a CMOS based 
microprocessor controlled cross point switching ma- 
trix, and provides a flexible assortment of features. 
This family of systems is engineered to allow the 
same telephones to migrate through the complete 
product line. 
400.2 COMMON EQUIPMENT 
The following components are necessary to operate 
the Starplus 2448EX Key Telephone System: (Refer 
to Appendix B for a complete component list with 
Part #‘s) 
Basic KSU 
Central Processor Board with generic soft- 
ware 
DC/DC Convener 
Key Station Interface Board 
Central Office Interface Board 
Power Supply 
External Power Housing 
Enhanced Key Telephone or 
Executive Key Telephone A. Basic Key Service Unit (KSU) 
The Basic KSU is housed in a wall-mount cabi- 
net that contains card slots for modular boards 
and associated pre-wired connectors. Both 
KSUs provide card slot positions for DC/DC 
Converter, Central Processing Board, 24 
CO/PBX lines (3 COl’s), 48 stations (6 KSB’s), 
an Application Board (APB), and two Power 
Failure Transfer units. One 
(1) KSU is required 
per system. 
B. External Power Supply Housing (EPH) 
The External Power Supply Housing is a wall 
mountable cabinet that houses the EPS 
motherboard (backplane), one Power Supply 
Units (PS), the Single Line Ringing Generator 
and Message Waiting Power Supply Unit (RG), 
and the Battery Charging Unit (BC). The EPH 
contains an ON/OFF power switch, an AC input 
cord, a DC output cord, battery connector panel 
for connecting 24V dc of battery power, an AC 
ON LED, a DC ON LED and a RING ON LED 
for the Battery Charging Board (BC). One (I) 
EPH is required per system. 
The Power Supply Unit (PS), Ring Generator 
Unit (RG) and the Battery Charging Unit (BC) 
all incorporate modular connectors that inter- 
face on the EPH motherboard allowing easy 
installation and removal of these units. 
C. Power Supply Unit (PS) 
This unit converts 117V ac to 24 volt power 
required for system operation only. One power 
supply is required to operate a fully loaded 
system. This unit plugs into the External Power 
Supply Housing (EPH). 
D. DC/DC Converter (DCU) 
This is a modular unit that converts the 24V dc 
power into 5V dc and 14V dc, the system oper- 
ating voltages. The unit also provides LED 
voltage indicators, test points and adjustments, 
as well as an input jack (RCA type) for Back- 
ground Music. 
E. Central Processor Board (CCU) 
This board provides the system’s main 16 bit 
microprocessor and operating memory. It con- 
trols all system activity including switching func- 
tions and feature operation. This board houses 
the Programmable Read Only Memory 
(PROM) with generic operating instructions, 
Issue 3, March 1992 400-l  
						

							Hybrid Key Telephone System sTARPLUS@ 2448EX 
Figure 400-l Starplus 2448 System Block Diagram 
400-2 Issue 3, March 1992  
						

							and Random Access Memory (RAM) for cus- 
tomer data base programming. A lithium bat- 
tery is included for protection of the RAM 
memory. An RS232C connector for data base 
printout and SMDR is included. Feature Pack- 
age software is installed on this board at the 
factory. One (1) CCU is required per system. 
F. Central Office Interface Board (COI) 
Provides the interface for eight central office 
(DTMF or Dial Pulse) loop start lines. The 
board can be removed or inserted with KSU 
power ON, however, the “Normal/Service” 
switch should be in the “Service” mode before 
removing or inserting the board into the system. 
An in-use LED for each circuit and a switch to 
take the board out of service are provided. 
The CO circuits are equipped with programma- 
ble current sensing circuitry that identifies dis- 
tant end disconnect loop supervision, if 
provided by the Central Off ice. 
G. Key Station Interface Board (KSB) 
Provides interface circuitry for eight Key Tc’c 
phones. The KSB will support any ,C 
Basic, Enhanced or Executive Key Tei(, +. ..,; !? 
set. The KSB board can be inserted or re- 
moved with the KSU power ON, however, the 
“Normal/Service” switch should be in the “Setv- 
ice” mode before removing or inserting the 
board into the system. An in-use LED and a 
switch to take the card out of service are pro- 
vided. A DSS/DLS or Phone Box can also be 
assigned to any one of the circuits. The KSB 
circuits are protected from mis-wiring and over- 
current. 
H. Single Line Telephone Interface Board 
(SLT) 
The Single Line Telephone Interface Board pro- 
vides interface for eight (8) -24 vdc single line 
(2500 type) telephones. Single Line Telephone 
Interface Boards (SLT) and Key Station Inter- 
face Boards (KSB’s) are inter-changeable with- 
in the system. Both standard DTMF and 
message waiting (9OV) DTMF single line tele- 
phones may be used. A Single Line Board is 
required when connecting to a Voice Mail Sys- 
tem and In-Band Integration is desired. An Ap- 
plication Board (APB) and a Ring Generator 
(RG) are required when installing Single Line 
Boards. 
400.3 
OPTIONAL COMPONENTS 
A. Application Board (APB) 
The Application Board provides the matrix and 
controlling circuitry for DISA, unsupervised B. 
C. 
D. 
E. 
F. conference and one external page zone as well 
as the circuitry for two DTMF receivers and two 
DTMF senders to support a small number of 
single line telephones. The APB has provisions 
for the addition of a Single Line DTMFRS Unit 
(SLU), used to support larger quantities of sin- 
gle-line telephones, and an RS232C Module 
(RSM) to add an additional RS232C port for 
outputing SMDR information only. This port 
cannot be used for programming locally or re- 
motely via a terminal. The APB also has a 
connection for Recorded Announcement 
(RAN) input and its control contacts. 
RS232C Module (RSM) 
This RS232C Module .(RSM) mounts on the 
Application Board (APB) and provides a second 
RS232C connector. This connector may be 
used to output SMDR data while the standard 
RS232C (located on the CCU) is used for sys- 
tem printout or Remote Administration. 
Single Line DTMF Receiver/Sender Unit 
(SW 
Used to expand the DTMF receivers and send- 
ers in the System to support single line telepho- 
nes. The module is added to the APB board 
and contains four DTMF receivers and one 
DTMF sender. 
Power Failure Transfer Unit (PFT) 
There can be two Power Failure Transfer Units 
installed in the Basic KSU, each providing auto- 
matic direct cut-through connection of six 
CO/PBX lines to six single line telephones in 
case of commercial power failure or system 
processor failure. The single line telephones 
may or may not be intercom stations. For each 
PFT installed, there is one set of Loud Bell 
Control contacts provided. This unit can be 
removed or inserted with power on the KSU. 
There is a manual switch that activates the PFT 
for testing purposes. 
Battery Charging Uuit (BC) 
The Battery Charging Unit (BC) installs into the 
External Power Supply Housing (EPH) and pro- 
vides the charging circuitry for a 24V dc battery 
package. The charging rate is 28V dc at 0.5 
ampere for the Basic KSU. 
Single Line Ring Generator and M/W 
Power Supply Unit (RG) 
Provides the 9OV ac, 20 Hz, ringing supply for 
supporting single line telephones and OPx’s. 
Also provides the voltage to light single line 
telephone M/W lights when Single Line Board 
cards are installed in the system. This unit 
plugs into the External Power Supply Housing.. 
Issue 3, March 1992 400-3  
						

							C. The Starplus Enhanced Electronic Telephone 
(Fig 400-2) is a fully modular instrument with 14 
fixed feature/function buttons and 16 flexibly 
assigned buttons or 8 fixed feature/function 
buttons. This telephone also features an inte- 
grated speakerphone, call announce with 
handsfree intercom, two (2) Volume Controls, 
Intercom select switch, and long life LED’s. 
Executive Electronic Telephone 
The Star-plus Executive Key Telephone is a fully 
modular instrument with 14 fixed feature/func- 
tion and 16 flexible buttons that can be flexibly 
assigned as either CO/PBX/Centrex lines, Sta- 
tion DSS, or feature/function buttons for the 
2448EX. This set also features an integrated 
48 character LCD display, and integrated 
speakerphone, call announce with handsfree 
intercom, two (2) volume controls, an intercom 
mode select switch, and long life LED%. 
D. DSS/DLS Consoles 
The station port used for a DSS/ DLS Console 
can be assigned as a Direct Station Select or 
Direct Line Select depending. on customer 
need. The bottom two rows of buttons on the 
DSS/DLS Console (Refer to Figure 400-2) con- 
tain 6-8 flexible buttons (depending on MAP 
chosen) which can be assigned by the station 
user in the same manner and functions as the 
flexible buttons on the keyset.  Hybrid Key Telephone System 
sTARPLUS@ 2448EX 
One (1) unit is required when the system will be 
equipped with single line telephones. E. Phone Box 
400.4 STATIONS 
A. Basic Key Telephone 
The Starplus Basic Electronic Telephone will 
operate on both Starplus Hybrid Key Telephone 
Systems. The Starplus Basic keyset is a fully 
modular instrument that features On-Hook dial- 
ing and Call Announce, Intercom, two (2) Vol- 
ume Controls, a Personal Directory, and a 12 
key “DTMF” dial pad. The Phone Box (Refer to Figure 400~2)allows 
Handsfree conversations for locations that do 
not need dialing privileges. Phone Boxes may 
be substituted for Key Telephones on a one-for- 
one basis. 
Note: Full speakerphone operation or Call An- 
nounce with handsfree rep/y on intercom are not 
provided with the Basic Key Telephone. 
On the 2448EX Hybrid Key Telephone the Ba- 
sic keyset offers compatibility by providing a 
loop button as one of the fixed 14 feature func- 
tion buttons. This allows the Basic keyset to 
both place and receive transferred CO line 
calls. 400.5 SYSTEM CAPACITY 
The Basic KSU is housed in a wall-mountable cabi- 
net that contains the backplane, two pre-wired con- 
nectors for Power Failure Transfer units, station and 
CO line boards, DC/DC Converter and an Applica- 
tions board. This Basic KSU has a capacity of 24 
CO lines and 48 Key Telephones and/ or Phone 
Boxes. DSS/DLS’s can be installed in place of any 
Key Telephone. Standard single line telephones 
(2500 type) can be installed by exchanging key 
station interface boards. Eight single line tele- 
phones can replace eight Key Telephones for each 
board exchanged. An ON/OFF switch is located on 
the left side of the Basic KSU. 
Note: Direct Incoming calls cannot be directed to the 
Basic keyset on the 244&%X. 
B. Enhanced Key Telephone 400.6 SYSTEM SPECIFICATIONS 
System capacity, electrical specifications, environ- 
mental specifications, and Loop limits are listed in 
Tables 400-1, 400-2, and 400-3 and 400-4. Dialing 
specifications are listed in Table 400-5. Dimensions 
and weight are listed in Table 400-7. Miscellaneous 
Specifications are listed in Table 400-8. Key tele- 
phone and Single Line telephone Audible Indications 
are listed in Tables 400-9, and 400-13. Key Tele- 
phone Visual Indications are listed in Tables 400-l 0, 
400-l 1, and 400-l 2. 
400-4 Issue 3, March 1992  
						

							Table 400-7 Dimensions and Weight 
BASIC KEY SERVICE UNIT 
Height 16” 
Width 23” 
Depth 13” 
Weight 60 Ibs. (unloaded) 
EXTERNAL POWER SUPPLY HOUSING 
Height 12” 
Width 12” 
Depth 13” 
Weight 36 Ibs. 
POWER SUPPLY 
Height 4.75” 
Width 4” 
Depth 9” 
Weight 5 Ibs. DSS/DLS CONSOLE 
Height 3” 
Width 5.5” . 
Depth 9.125” 
Weight 2 tbs. 
PHONE BOX 
Height 1.75” 
Width 
5.5” 
Depth 4” 
Weight 1 lb. 
KEY TELEPHONE 
Height 3.75” 
Width 8.0” 
Depth 8.5” 
Weight 3 Ibs. 
Table 400-8 Miscellaneous Specifications 
Memory: 
Random Access Memory (RAM) 
Programmable Read-Only-Memory (PROM) 
Telephone Transmitter: 
Talk Paths: 
CO/PBX/Centrex paths: 
Intercom Paths: 
Music Channels: 
Account Codes: 
Number of digits per code: 
Number of Account Codes: 
Speed Dialing Capacity: 
System Speed 
Station Speed 96K expandable to 128K 
384 expandable to 512K 
Electret mic compatible. 
24 CO/PBXCentrex talk paths (non-blocking) 
10 talk paths (only 8 available for SLTs) 
1 channel provides music for music-on-hold and 
background music 
up to 12 unverified digits 
unlimited 
1360 total bins in system 
80 bins per system 
1280 bins per system .. 
issue 3, March 1992 400-9  
						

							Hybrid Key Telephone System sTARPLUS@ 2448EX 
, 
Table 400-9 Key Telephone Audible Signals 
TYPE OF SIGNAL 
Key Telephone Signals; 
Incoming CO Line 
Intercom Tone Ringing 
Intercom Call Announce 
0-W 
Transferred CO Line 
CO Line Recall 
Message Wait Call Back 
Message Wait Reminder Tone 
CO Queue Call Back 
Camp-on 
Paging Alert Tone FREQUENCY 
1215/l 471 
1215l1471 
935 SIGNAL DURATION 
0.8s orV2.4~ off; repeated 
0.4s on/o.4s off/o.4s orv2.os off 
0.2s orVO.2~ off (3 bursts) 
1215/1471 
1215/l 471 
1215l1471 
771 
1215l1471 
1215l1471 
935 0.8s onI2.4~ off 
0.8s onJ2.4~ off 
0.4s on/o.4s off/o.4s on/2.os off 
0.6s on (timed) 
0.2s orVO.6~ off; repeated 
0.2s orVO.2~ off/O.2s on (once) 
1 sec. (burst) 
Key Telephone Confidence Tones; 
Intercom Ringback 
Call Announce 
Busy Tone 
Error Tone 
Intercom Dial Tone 
DND Tone 
Paging Confirmation 
Programming Confirmation 
Programming Error 
Confirmation Tone 701 
935 
701 
701 
701 
701 
935 
1471 
1471 
1471 0.4s on/o.4s off/o.4s on/2.os off 
0.2s orVO.2~ off (3 bursts) 
0.4s orVO.4~ off, repeated 
0.2s orVO.2s off, repeated 
Continuous 
0.2s onlO.2~ off, repeat 3~‘s. pause, 0.5s 
repeat 
1 set burst 
1.4 set burst 
0.2s 011/0.2s off, 6x’s 
1 set burst, 1 time 
Table 400-l 0 DSS/BLF Button Visual Indicators 
TYPE OF SIGNAL 
Qff-HooWBusy (All Stations) 
Incoming Intercom Ring (Destination) 
Call Announce (Destination) 
Message Waiting Call Back (Destination) 
Do Not Disturb (All Stations) 
Door Box Calling (Assigned Stations) 
Automatic Call Back (Destination) INDICATOR FLASH RATES 
Steady 
120 ipm flutter 
120 ipm flutter 
120 ipm flutter 
60 ipw flash 
30 ipm flash 
120 ipm flutter 
400-l 0 Issue 3, March 1992  
						

							wARPLUS@ 2448EX 
SECTION 500 
INSTALLATION 
Hybrid Key Telephone System 
500.1 SITE PLANNING 
The Starplus 2448EX Hybrid Key Telephone Sys- 
tem, like most electronic office equipment, should 
not be subjected to harsh environmental conditions. 
To assure easy servicing and reliable operation, 
several factors must be considered when planning 
the system installation. Always remember the fol- 
lowing BEFORE installing the KSU and wiring: 
The Basic KSU, and External Power Supply 
Housing are designed for wall mounting. 
The External Power Housing operates on 117V 
ac, 60 Hz single phase electricity. A 3-wire 
(parallel blade with ground) receptacle must be 
provided on a dedicated, separately fused 15 
ampere circuit. 
The KSU should be within 25 feet of the tele- 
phone company (Telco) RJ21X. The KSU 
should be centrally located and care should be 
taken to stay within prescribed cable lengths. It 
is recommended that 24 AWG 3-pair twisted 
cable be used. 
Mounting space for standard backboard, or a 
plywood type board for MDF blocks, if a stand- 
ard backboard is not used. 
A well ventilated area having a recommended 
temperature range of 70 to 78 degrees Fahren- 
heit and a humidity range of 5 to 90% (non-con- 
densing). 
Lighting and accessibility of KSU for servicing. 
Protection from flooding, flammable materials, 
excessive dust, and vibration. 
Proximity of radio transmitting equipment, arc 
welding devices, copy machines, and other 
.electrical equipment that are capable of gener- 
ating electrical interference. 
Access to a good earth ground such as a me- 
tallic COLD water pipe. Inspect the pipe for 
non-metallic joints. 
500.2 UNPACKING THE 2448EX BASIC 
SYSTEM 
A. Remove the Key Service Unit from the shipping 
carton and stand it upright on a level working 
surface with the cover facing forward. 
B. Remove the cover by turning the two screws on 
the front of the cabinet i/4 turn and tilting the 
cover outward. C. 
D. Remove all remaining items from the Basic 
System packing box and inspect for shipping 
damage. 
The Basic System ships with all the compo- 
nents necessary for a working 8 CO line by 8 
station system. The components included in the 
Basic System Package are: 
l (1) Basic Key Service Unit (BKSU) 
- BKSU Mounting Template 
l (1) External Power Housing (EPH) 
- EPH Mounting Template 
- AC Power Cord 
- Battery Bypass Board (installed in EPH) 
l (1) Power Supply (PSl 0) 
l (1) DC/DC Converter (DC/DC) 
l (1) Central Processor Board (CCU) 
- Including 2448EX Installation Manual 
l (1) Central Office Board (COI) 
l (1) Key Station Interface Board (KSB) 
- Including 8 Key Station User Guides 
l (1) Attendant User Guide 
Optional System items are: 
Additional Central Office Interface Board 
WI) 
Additional Key Telephone Interface Board 
(KW 
Single Line Telephone Interface Board (SLT) 
Applications Board (APB) 
Single Line Telephone DTMFRS Unit (SLU) 
RS232C Module (RSM) 
Power Failure Transfer Unit (PFT) 
Battery Charging Board (BC) 
Single Line Ring Generator and Message 
Wait Power Supply (RG) 
Refer to Appendix B for a complete component 
offering and their associated part numbers. 
issue 3, March 1992 500-I