PART TWO - STANDARD FEATURES
001-0131B October 1997 Page 6
2.4.3 Voice Prompt Ordering
Do not order these options if any PageSaver options (as specified in section 2.3.2) have been ordered.
The voice prompt options are included with PageSaver. If specified in section 2.4.1, then order the
System Voice Prompts (950-9069) option. If specified in section 2.4.2, order both
the System (950-9069)
and Subscriber (950-9127) recorded prompts options.
2.4.4 Do you want to have a mirrored disk that backs up system and client prompts?
yes
no
2.5 TELCO PORTS
The number of telco ports installed in the paging terminal is adjustable. The telco ports are supported on
either a digital T1 chassis which can handle up to 24 telco channels, or on analog telco port cards which
can handle two telephone lines. Up to 2 digital T1 chassis or up to 29 telco cards can be installed in the
terminal. These can be added at any time in the field.
The number of telco ports calculated in this section can be adjusted by the customer based on their
particular requirements. Or if desired, only some of the telco ports can be purchased as part of the initial
system installation, and then additional telco ports can be purchased and added later as the system
expands.
2.5.1 Number of Trunks to Support Paging
An example of how to follow the calculations made in this section is included in section 2.5.1.4 to help
clarify the equations and calculations described in this section. The calculations described in this section
are primarily to demonstrate how the calculations for telco line traffic are done, and what the average
usage rates for a paging terminal are. The values for things like the length of time a display page or voice
page takes are estimates based on industry averages. For any particular installation, these values may
vary. The customer should consider whether there are special circumstances which might cause the
values shown in this document to be somewhat different. For example, if the customer plans to use the
system for extensive voice paging, an average 15 second voice page might not be sufficient. Similarly, if
the system is to be very heavily used, more than 25% of the system subscribers might receive a page
during the terminal’s busiest hour.
2.5.1.1 What is the acceptable percentage of calls on which a caller might get a busy signal
(known as “grade of service”) ?
1% or less
2%
5%
2.5.1.2 Determine the total offered telco traffic during busy hour for paging and messaging
2.5.1.2.1 Determine the offered telco traffic due to basic paging
The average display page takes 12 seconds to be input by a caller. The average voice page takes 15
seconds. Determine the average time per paging call using the following equation (must be between 12
and 15 seconds):
average length of call (seconds) = ( 12 seconds x % of display pagers - section 2.1.2) +
( 15 seconds x % of voice pagers - section 2.1.2)
Assuming that 25% of your subscriber base receives a page during your busiest hour, determine the total
trunk in use time for paging using the following equation:
trunk in use time (seconds) = # subscribers (from section 2.1.1) x
average length of call (from above) x 25%
(232 Seiten)
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