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Paging/Wireless Messaging
Network Summary
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| Brief
Description |
- Specialized wireless network
for broadcasting a message to specific pager to call back
a specific number
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| Components |
- Personal paging device
- Paging computer/server at
service provider’s site
- Paging transmitter;
- Use of satellite for
national coverage
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| Frequency
Bands |
- Different frequencies sub800
MHz - older paging networks; New networks are
typically in the PCS narrowband 901-902, 930-931 and
940-941 MHz;
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| Coverage |
- Many local, regional or
national paging networks
- 95 % of the U.S. is covered.
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| Capacity
and Speed |
- Paging networks have
different design criteria for delivering the message
within specific time periods
- 1200 bps for data
transmission.
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| Communications
Protocols Supported |
- TAP for numeric data;
- TDP for 8 bit non-ASCII
data.
- ReFlex 50 protocol developed
by Motorola for two-way paging.
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| Most
Suitable Applications |
- Personal numeric messaging
for call back
- Alphanumeric messaging —
dispatching and service
- Two-way messaging — call
dispatching with confirmation
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| Costs |
- $ 50 for pager and $5-$50
per month for messages (numeric to text to two-way)
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| Availability |
- Has been available for many
years
- Two-way messaging started in
1995
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| Security |
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| Pros |
- Very easy to operate for
sender (from any telephone) and receiver
- Excellent coverage —
local, regional , national, international (Canada and USA)
- Good building penetration
- Many options — numeric,
alphanumeric, two-way, message storage
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| Cons |
- Some networks are overloaded
causing delays
- No acknowledgment (though
slightly more expensive two-way paging is now available)
- Very few two-way paging
applications.
- Slow data transfer rate
(1200 bps) for non-PCS narrowband paging networks
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