PART TWO - STANDARD FEATURES
001-0131B October 1997 Page 9
2.5.1.4 Example
You are a hospital administrator who wishes to put in a private paging system. Since your system will be
used by emergency personnel, you want to insure that they receive a few busy signals as possible when
they call the paging terminal. Therefore you select a 1% busy signal rate as being the most busy signals
you can accept during your busiest hours of the day.
You plan to give your emergency response teams voice pagers and all the other hospital personnel
alphanumeric display pagers. You figure you’ll have 100 voice pagers and 300 alphanumeric pagers
(25% voice and 75% Display). The equations for calculating trunk in use time for pagers are as follows:
average length of call (seconds) = (12 seconds x 75%) +( 15 seconds x 25%) = 12.75 seconds
trunk in use time (seconds) = 400 x 12.75 x 25% = 1275 seconds
You plan to have voice prompts on your system to insure that callers can easily navigate through the
system. The equation for calculating trunk in use time for voice prompts is as follows:
trunk in use time (seconds) = 400 x 7 seconds x 25% = 700 seconds
You also plan to have an integrated voice messaging system inside the paging terminal. The equation for
calculating trunk in use time for voice messaging is as follows:
trunk in use time (seconds) = 400 x 30 seconds x 25% = 3000 seconds
The total offered traffic per hour is the total of the previous three equations:
trunk in use time (seconds) = 1275 + 700 + 3000 = 4975 seconds
The total offered traffic converted to hours is:
trunk in use time (hours)= 4975 / 3600 = 1.38 hours
Using the tables shown in section 2.5.1.3, the number of trunks that need to be installed in your terminal
to insure only 1% busy signals is 6.
2.5.2 How many digital T1 spans will you be using?
none
1 (24 trunks)
2 (48 trunks)
There are two types of trunks: digital T1 and analog. If you will be using more than 6 trunks for paging
applications (see section 2.5.1.3), you should consider using the digital T1 interface because your phone
company may provide T1 for less money than multiple analog lines. Check with your phone company to
evaluate the difference in price for the number of trunks you will be using. Each T1 span supports 24
telco trunks. One or two T1 spans can be supported by the paging terminal.
Order the quantity of Digital T1 Interfaces (905-0033 or 905-0034) specified above with the input power
specified in section 7.4.
2.5.3 How many analog trunks will you be using?
none
1-2
3-4
5-6
7-8
9-10
11-12
13-14
15-16
17-18
19-20
21-22
23-24
25-26
27-28
29-30
31-32
33-34
35-36
37-38
39-40
41-42
43-44
45-46
47-48
49-50
51-52
53-54
55-56
57-58
If you will not be using Digital T1 for your paging trunks, then this will be the number of trunks needed for
paging from section 2.5.1.3.
(232 paginas)
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