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OM20 Universal Outdoor Modem
Summary and Examples:
The following examples further illustrate how to calculate the Efficient D&I rate which can be
summarized for N timeslots as:
Efficient D&I Rate
With E1 signaling add
N * 2000 bps
With Enhanced Async add
(Truncation (In-Band Baud / (N * 125))) * (N * 125) bps
Example 1a:
5 Drop Slots with T1-D4 framing, standard ES to ES overhead
For 5 Drop Slots, the Data Rate would be 5 * 64000 or 320000 bps
The Efficient D&I Rate would be 320000 + (5 * 250) bps = 321250 bps
The Open Network rate is over 20,000 bps higher at 341333 bps.
Example 1b:
Change to E1-PCM30 framing (E1 Signaling), standard ES to ES overhead
Add 5 * 2000 bps to our previous calculation gives 331250 bps
Still saving over 10,000 bps compared to the open network standard.
Example 1c:
Change to Enhanced Async with In-Band Baud Rate of 1200
X = Truncation of (1200 / (5 * 125)
X = Truncation of (1.92)
X = 1
Add 1 * 5 * 125 bps to our previous calculation gives 331875 bps
An increase of 625 bps to carry 1200 baud
Example 2a:
10 Drop Slots with T1-D4 framing, standard ES to ES overhead
For 10 Drop Slots, the Data Rate would be 10 * 64000 or 640000 bps
The Efficient D&I Rate would be 640000 + (10 * 250) bps = 642500 bps
The Open Network rate is over 40,000 bps higher at 682667 bps.
TM116 – Rev. 1.2
=
Data Rate + (N * 250 bps)
Appendix F
F-
4
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