Vodavi Starplus 2448ex Hybrid Key Telephone System Installation Manual

							~--~ . ..-- -- 
STARPLUS 2448EX 
Hybrid Key Telephone System 
To calculate a particular systems MTBF: 
400.7 
MEAN TIME BETWEEN FAILURE 
WW 
The Mean lime Between Failure (MTBF) for each 
components of the 2448EX Key Telephone System 
is shown in Table 400-15. The MTBF figures are 
calculated based on: 
l Specifications: BellCoRe YR-TSY-000332” 
l Quality Factor: Level 2 
, 
l Environmental Factor: Group Benign (1 .O) 
l Method: Parts Count Method 
Mean Time Between Failure (MTBF) represents for 
a particular interval, the total functioning life of a 
population of an item divided by the number of 
failures within the population during the measure- 
ment interval. The definition holds for the time, cy- 
cles, miles, events, or other measures of life units. 
This does NOT provide a definite failure time but only 
indicates possible failure probabilities based on cal- 
culations. 1. multiply the quantity of each component in the 
system by its failure rate. 
Component Qty X ‘t$r 
= Resultant 
2 X 2064.2 = 4128.4  Power 
SUPPlY 
2. Add the resultants from step 1 for all compo- 
nents used to configure a system. 
3. Divide the total number derived from step 2 m 
1 ,OOO,OOO,OOO. This will provide the system’s 
MTBF rated in hours. 
1 ,ooo,ooo,ooo 
= System MTBF Rated 
Total (from Step 2 in Hours 
Table 400-S Mean Time Between Failures (MTBF) 
DEVICE 
Basic Key Service Unit (KSU) 
Power Supply Unit (PS) 
External Power Housing (EPH) 
DC/DC Converter (DC/DC) 
Central Processor Board (CCU) 
Central Office interface Board (COI) 
Key Station Interface Board (KSB) 
Single Line interface Board (SLT/SIB) 
Application Board (APB) 
RS-232C Module (RSM) 
Single tine DTMFRS Unit (SLU) 
Power Failure Transfer Unit (PFT) 
Ring Generator Unit (RG) 
Battery Charging Unit (BC) 
Key Telephone 
DSSJDLS Console 
Phone Box FAILURE .RATE MTBF IN HOURS MTBF IN YEARS 
(for a sinnle unit) ffor a sinole unit) 
931.6 
1073422.1 122.5 
2064.2 
484449.2 55.3 
3920.6 
255063.0 29.1 
4160.0 
240384.6 27.4 
16179.3 
61807.4 7.1 
9341.4 
107050.3 12.2 
5093.0 196347.9 22.4 
10677.4 93655.8 10.7 
7818.7. 127898.5 14.6 
1212.4 
824610.3 94.2 
825.2 1211827.4 138.3 
1615.0 
619195.0 70.7 
1509.0 662690.5 75.6 
2310.6 432788.0 49.4 
6022.9 166033.0 19.0 
2511.3 
3986200.1 45.5 
4209.2 
237574.8 27.1 
Issue 3, August 1991 
400-13  
						

							-1 
sTARPLUS@ 2448EX Hybrid Key Telephone System 
SECTION 500 
INSTALLATION 
500.1 SlTE PLANNING 
The Statplus 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- 
bwing 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 (Delco) RJ21X The KSU 
should be centrally located and care should be 
taken to stay within prescribed cable lengths. lt 
is recommended that 24 AWG 3-pair twisted 
cable be used. 
Mounting space for standard backboard, or a 
plywood type board for MDF blocks, il 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 ftooding, flammable materials, 
excessive dust, and vibration. 
Proximity of radii 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 rne- 
talfii 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 shiiing 
damage. 
The Basic System ships with all the compo- 
nents necessary for a working 8 CO line by 16 
station system. The components incfuded in 
the Basic System Package are: 
l (1) Basic Key Service Unit (BKSU) 
- BKSU Mounting Template 
l (1) Extemal Power Housing (EPH) 
- EPH Mounting Template 
- AC Power Cord 
- Battery Bypass Board (installed in EPH) 
l (1) Power Supply (PSlO) 
l (1) DC/DC Converter (DC/DC) 
l (1) Central Processor Board (CCU) 
7 Including 2448EX Installation Manual 
l (1) Central Office Board (COI) 
l (2) Key Station Interface Board (KSB) 
- Including 16 Key Station User Guides 
l (1) Attendant User Guide 
Optional System items are: 
Additional Central Office Interface Board 
WI) 
Additional Key Telephone Interface Board 
WB) 
Single tine Telephone Interface Board (SLT) 
Applications Board (APB) 
Single tine 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 Appendii B for a complete component 
offering and their associated part numbers. 
Issue 3, August 1991  
						

							Hybrid Key Telephone System sTARPLUs@ 2448EX 
500.3 SYSTEM GROUNDING 
To ensure that the system will operate properly, a 
god earth ground is required. Use d the T&o 
ground (source not demark) or a metallic COLD 
water pipe usually provides a reliable gound path. 
Carefully check that the pipe does not contain insul- 
ated joints that could isolate the ground. In the 
absence of the COLD water pipe, a ground rod or 
other source may be used. A no. 8 AWG copper wire 
should be used between the ground source and the 
KSU and EPH (25 feet maximum). The farther from 
the ground source, the larger the ground wire used 
should be. The wire should be kept as short as 
possible and can be connected to the ground lug 
provided on the lower left side of the front face of the 
KSU (cover off) (Refer to Figure 500-l) and the right 
side of the EPH. 500.4 KSU INSTALLATION 
Refer to Figures 500-1,500-2, and 500-3 for general 
mounting arrangements and dimensions. -The KSU 
is mounted in the following manner: 
The KSU is designed for wall mounting only, 
and should not be mounted directly on a ma- 
sonry or dry walled surface. A wooden back- 
board (plywood or pressed board) of sufficient 
size should be attached to the wall for the KSU 
to be mounted upon. The KSU mounting tem- 
plate should be used to identify screw hole 
locations. It is important that the KSU and MDF 
connecting blocks be mounted on the back- 
board. 
EPH 
I r-----l 
KSU 
Figure 500-l Mounting Arrangements 
500-2 
Issue 3, August 1991  
						

							sTARPLUS@ 2448EX Hybrid Key Telephone System 
7-T 
16‘ 13’ 
						

							--- 
Hybrid Key Telephone System STARPLUS@ 2448EX 
CCCKKKKKK 
i COOOSSssssr 
CIIlBBBBBBp 
CABLE RACEWAY 
STATIONS 
LEFT SIDE OF 2448EX KSU 
1//l/ ///II lllll lllll I//// 
Figure 500-3 Basic KSU 
500-4 Issue 3, August 1991  
						

							=ARWS@ 2448EX 
_- -- 
Hybrid Key Telephone System 
A. Insert 4 (#IO or larger) screws into the back- 
board and tighten enough to hold the weight of 
the KSU. Lift the KSU and place it onto the 
screws. When the KSU is in position, the 
screws can be tightened and the KSU is se- 
curely mounted. 
-. 500.5 UGHTNING PROTECTION 
The Starplus 2448EX Hybrid Key Telephone System 
should have Central Office lines and OPX stations 
protected with proper lightning surge arrestors. This 
will provide protection from damaging surges on 
sensitive cabling by non-direct lightning strikes. 
The protection should contain a compliment of three- 
element gasdischarged tubes to ground high poten- 
tial surges, and associated circuits to absorb and 
filter lower level surges. This type of lightning pro- 
tection is available through telephone equipment 
supply houses. Care should be taken to ensure that 
such protection devices are installed in accordance 
with the manufacturer’s instructions and to ensure 
that no more than one set of protectors be installed 
on central office lines at the installation premises. 
Improper installation can be a serious safety hazard. 
Failure to provide the proper lightning protection wig 
increase maintenance expense and require more 
available spare parts. 
500.6 EXTERNAL POWER SUPPLY HOUS- 
ING (EPH) INST’ALLATlON 
The External Power Supply Housing should be wall 
mounted onto the same backboard as the KSU. The 
power housing must be located within three feet of a 
separately fused 15 ampere, 1 IN ac power outlet 
A four foot DC output cord is provided for intercon- 
nection of the KSU and External Power Housing. 
A 
battery backup Bypass Board is installed in the BC 
slot of the External Power Housing (EPH). This is 
required to provide system power when a Battery 
Charging (BC) card is not installed. 
The power supply may be located to the left of the 
Basic KSU 
or above the BKSU. 
(Refer to Figures 500-I and 500-2) 
Using the template provided, spot punch the mount- 
ing surface through the template four comers. Install 
four (no. 10 or larger) screws into the backboard and 
tighten to about l/8 inch from the mounting surface. 
Lift the EPH housing onto the four screws and 
tighten. 
--. 
x. Connect the DC output cord of the EPH to the Basic 
KSU by aligning the connector pins, pressing inward, 
then turning the collar of the connector clockwise 
until tight. Do not connect AC power cord to an AC 
outlet at this time. 
500.7 POWER SUPPLY (PS) INSTALLATION 
Install the Power Supply into the EPH housing by 
sliiing it into the respective mounting slat. Lo& the 
power supply into the EPH housing by sliding the 
mounting lock to the left and tightening by turning 
clockwise (Refer to Figure 500-4). 
Plug the associated AC IN 
power cord into the AC 
IN socket on the Power Supply. 
Then plug the DC 
cord into the DC output connector on the power 
WPiy. 
500.8 
BAlTERY BACK UP INSTALlATlON 
A Battery Charging Unit (BC) is an option that can 
be installed in the External Power Housing and will 
maintain system operation during loss of AC power. 
A separate external 24V dc battery package must be 
provided. 
Do not make connections with the power 
applied to the External Power Housing. 
Also remove power from the KSU by tum- 
ing the power switch to off (located on the 
left side of the BKSU). 
Before installing the Battery Charging Unit (BC) turn 
off the AC 
power switch on the front of the EPH. To 
install the BC, remove the cover of the External 
Power Housing (EPH). Locate the BC card slot and 
remove the Battery Bypass Board. 
41 
Table 500-l Battery Back Up Duration 
The BC unit provides a Tone Emitter switch to enable 
(ON) or disable (OFF) tone signaling when System 
Battery Back Up is active (Refer to Fwre 500-5). 
Install the Battery Charging (BC) unit with wmpo- 
nents facing right into the,BC card slot of the EPH. 
Issue 3, August 1991 500-5  
						

							PSl 
0 B 0 0 
l-1 I 
OcO 
MO ON 
RING 0 
OFF 
L!J 
RI3 
EC 
U 
---. 
8 
l-l 
244aEx Power supply (PS) 
MODEL 
GPS7A External Power Housing - Right side 
CAUTION: Remove the shorting strap from 
the battery connecting terminals on the right 
side of the EPH before connecting batteries. 
Figure 500-d External Power Housing (EPH) 81 Power Supply 
5004 
Issue 3, August 1991  
						

							sTARPLUS@ 2448EX Hybrtd Key Telephone System 
n 
Figure 500-5 Tone Emitter on Battery Charging Card 
CAUTION: IMPORTANT STEP 
Remove the 
shorting strap from the 
battery connection terminals on the 
right side of the EPH before connecting 
batteries. 
External batteries may now be connected using 
stranded wire with crimp on ring terminals. A 24V 
dc (normally two 12V dc batteries) package with a 
46 ampere hour rating is considered maximum. It is 
recommended that maintenance free gel-type bat- 
teries be used. The following should be considered 
when connecting batteries: 
Batteries are to be placed in 
a limited access room 
or cabinet with adequate ventilation of any battery 
gases that may be present. 
A battery rack or case should be used to secure the 
batteries and protect them. 
Use the shortest length of stranded wire possible to 
connect the batteries. Use wire sizes recommended 
by the National Electrical Code and/or local regula- 
tions. 
A 12 ampere, 32V minimum fuse or a 12 ampere DC 
instantaneous tn’pping circuit breaker should be in- 
stalled in line with the battery negative lead to protect 
the batteries from damage. Refer to the Typical 
Battery Interconnection Layout, Figure 500-6. 
Depending on batteries used, the recharge time to completely recycle a fully discharged battery will 
follow the examples below: 
21 
Table 500-2 Battery Recharge Time 
500.9 PRINTED CIRCUIT BOARD INSTAL- 
LATION 
The Printed Circuit Boards (PCB’s) used to confgure 
the system contain static sensitive components that 
will require a few simple handling precautions to 
avoid damage. 
Keep all PCB’s in their protective anti-static bags 
until they are installed in the KSU. All PCB’sthat are 
not in protective bags should be handled by the card 
edges only. 
Never lay an unprotected PC8 card on a carpeted 
surface. 
(1 
Always use a grounded wrist strap when 
handling PCB’s. This will minimize the 
possibility of static damage. 
issue 
3, August 1991 500-7  
						

							Hybrid Key Telephone System sTARPLUS@ 2448EX _ 
~ 12 VOLT BATTERIES (2) 
STRAIN RELIEF 
CABLE ASSY AND SEPARATOR ‘+= MARKER 
% 
+ 
- 
l -’ MARKER 
EXTERNAL POWER HOUSING (EPH) 
Figure 500-5 Typical Battery interconnection Layout 
A. Installing the DC/DC Converter Unit 
(DC/DC) 
Locate and unpack the DC/DC Converter Unit 
(DCU). Using the ejector tabs, insert the unit into the 
BKSU card slot 0 or DC/DC card slot. 
B. Installing PCBs 
NOTE: Wth the exception of the CCU and DC/DC, 
PCBs can be safely unplugged with the power on but 
it is suggested that the Norm&Service switch be 
placed in the 3etvike” mode while removing or in- 
seftjng into the system. 
When inserting a card into the KSU, make sure the 
card edges are aligned with the KSU card guides, 
that the service switch is in the service (down) posi- 
tion, and that the component side of the card faces 
to the right. Note, the card ejector tabs are color 
coded to match the designations on the KSU. Make 
sure the PCB’s are securely seated in their respec- 
tive card connectors. 
Press firmly on the card ejector tabs once the PCB 
is mounted into the KSU. The service switch should 
be returned to the normal (up) position. 
C. PCB Programming 
The COI (Figure 500-g) KSB (Figure 500-10) SLT 
cards each have a service switch on the front of the 
card. The switch should be in the Normal (up) 
position for normal operation. 
The CCU has a DIP switch assembly for program- 
ming various system functions. Make sure the switches are positioned according to the functions 
described in Figure 5008. The APB board provides 
connectors for SLU and RSM. 
500.10 CO/PBX CONNECTIONS 
An FCC approved RJ21X connector should be sup- 
plied by the Telco at the demarcation point. The 
RJ21X should be located within 25 ft. of the KSU. 
All CO/PBX line connections are made on the Pl 
cable. The Pl connector is located in the Basic KSU. 
A COI card must be installed in the associated KSU 
card slot in order for the CO/PBX line interface 
connections to be established (Refer to Table 500-3. 
500.11 STATION CONNECTIONS 
There is a 50-pin female amphenol-type connector 
on each station KSB, SLT card. These allow the 
system to be cabled to the main distribution frame 
(MDF). Twenty-five pair telephone cabling must be 
prepared with mating connectors to extend the KSU 
interface circuits to the MDF. The cables are routed 
through the cable clamps at the bottom of the KSU 
to the MDF. These cables are then terminated on 
industry standard 66Ml-50 type punchdown wn- 
nectar blocks (Refer to Tables 500-5, and 500-6). lt 
is recommended that 66Ml-50 split blocks with 
bridging clips be used to simplify troubleshooting 
and to quickly isolate faults. 
The amphenol type connectors will be on the front 
edge of the printed circuits boards which are plugged 
into the green colored card slots. These connectors 
require male plug-ended cables for proper attach- 
500-6 Issue 3, August 1991  
						

							%ARPLUS@ 2448fEX Hybrid Key Telephone System 
--_ _-. . 
COLORED TABS 
TEST 
.4 
ADJUSTMENT BGM VOLUME 
“e +5 VDC 
BACKGROUND MUSIC BGM 
CoNNECT’oNS 
Figure 500-7 DC/DC Converter Unit (DC/DC) 
Issue 3, August 1991 500-9