Vodavi Starplus 2448ex Hybrid Key Telephone System Installation Manual

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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...

-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...

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...

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

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Hybrid Key Telephone System STARPLUS@ 2448EX 
CCCKKKKKK 
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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...

PSl 
0 B 0 0 
l-1 I 
OcO 
MO ON 
RING 0 
OFF 
L!J 
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EC 
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---. 
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...

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...

%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