| Signaling
Speed: |
512 |
bps |
1,200 |
bps |
2,400 |
bps |
POCSAG
Coding Format |
| Preamble
Length: |
1.1250
|
sec |
0.4800
|
sec |
0.2400
|
sec |
A preamble
contains 576 bits |
| Assumed to
be sent 1 time |
|
|
|
|
|
|
|
|
|
| for each
|
30 |
batches |
|
|
|
|
|
|
|
|
|
| Batch
Length: |
1.0625
|
sec |
0.4533333
|
sec |
0.2266667
|
sec |
1 batch
= |
1
sync codeword plus 8 frames (2 codewords each frame) =17 codewords |
| Fully Loaded
Paging event with |
30 |
Batches:
|
33.00 |
sec |
14.08 |
sec |
7.04 |
sec |
preamble
length + 30 X batch length |
| The number
of available events in a |
1 |
hour period
|
|
|
|
|
|
|
|
|
|
| with |
30 |
batches
per |
|
|
|
|
|
|
|
|
|
| event |
= |
|
109 |
|
256 |
|
511 |
|
|
|
|
| At |
8 |
frames |
|
|
|
|
|
|
|
|
|
| available
per batch |
|
|
|
|
|
|
|
|
|
|
| and |
2 |
codewords
|
|
|
|
|
|
|
|
|
|
| in
each frame, there are: |
16 |
|
16 |
|
16 |
|
codewords
per batch |
| |
|
|
480 |
|
480 |
|
480 |
|
codewords
per 30 batch event |
| |
|
|
52,320
|
|
122,880
|
|
245,280
|
|
codewords
available per hour |
| From
an efficiency stand point, in the System Capacity calculations that follow
only |
90% |
of
the available codewords will be considered available. |
| Hence,
a |
512 |
POCSAG
System provides |
47,088
|
codewords
per hour. |
|
|
|
| |
1,200
|
POCSAG
System provides |
110,592
|
codewords
per hour. |
|
|
|
| |
2,400
|
POCSAG
System provides |
220,752
|
codewords
per hour. |
|
|
|
| Address
and Messaging Structure and Calls per User Hour Influence: |
|
Page Structure |
Address
+ Message Codewords Required |
|
Expected
Peak Call Rate per User Hour |
Effective
Codewords |
| Tone
|
1
+ 0 = |
1 |
0.15
|
0.15 |
| Numeric
10 digit |
1
+ 2 = |
3 * |
0.25
|
0.75 |
| Alphanumeric
40 Char |
1
+ 14 = |
15 ** |
0.30
|
4.50 |
| 10%
T, 70% N10, 20% A40 |
=
|
1, 3,
15 |
0.15,
0.25, 0.30 |
1.44 |
| System
Capacity = Number of Codewords available per Hour ÷ Effective Codewords
Required |
|
System Structure |
Effective
Codewords Required |
512
bps POCSAG Number of Users @ Efficiency below |
1,200
bps POCSAG Number of Users @ Efficiency below |
2,400
bps POCSAG Number of Users @ Efficiency below |
| 100%
Tone |
0.15
|
313,920
|
735,750
|
1,471,500 |
| 100%
Numeric 10 digit |
0.75
|
62,784
|
147,150
|
294,300 |
| 100%
Alphanumeric 40 char |
4.50
|
10,464
|
24,525
|
49,050 |
| 10%
T, 70% N10, 20% A40 |
1.44
|
32,700
|
76,641
|
153,281 |
| |
|
|
Efficiency:
|
90% |
Efficiency:
|
90% |
Efficiency:
|
90% |
| * |
A
Numeric digit requires 4 bits; with the (32,21) codeword |
|
|
| |
20
bits are available for messaging -- this yields 5 digits per codeword |
|
|
| |
2
codewords are required for 10 digits |
|
|
| ** |
An
Alphanumeric character requires 7 bits; with the (32,21) codeword |
|
|
| |
20
bits are available for messaging -- this yields 2 6/7 characters per codeword
|
|
|
| |
14
codewords are required for 40 characters |
|
|
