Available Ratios; Introduction - Comtech EF Data CDM-625 Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)
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15.1 Introduction

Subsystem Multiplex – referred to throughout this manual as Sub-Mux – is a secondary
framing structure that combines IP traffic with any currently available combination of framing
and interface type (excluding IP itself). The composite data rate to the modulator and from
the demodulator is referenced to the primary, non-IP interface rate by a specific ratio selected
by the user.

15.2 Available Ratios

The IP portion of the modem traffic can be either smaller or larger than the primary interface by
the following ratios:
Ratio
1/59
1/39
1/19
1/9 or 9
1/8 or 8
1/7 or 7
1/6 or 6
1/5 or 5
1/4 or 4
2/7 or 7/2
1/3 or 3
2/5 or 5/2
3/7 or 7/3
1/2 or 2
3/5 or 5/3
2/3 or 3/2
3/4 or 4/3
4/5 or 5/4
1/1
Chapter 15. IP S
IP Portion of Modem Traffic
IP traffic is one-fifty-ninth the primary
IP traffic is one-thirty-ninth the primary
IP traffic is one-nineteenth the primary
IP traffic is one-ninth the primary, or 9 times the primary
IP traffic is one-eighth the primary, or 8 times the primary
IP traffic is one-seventh the primary, or 7 times the primary
IP traffic is one-sixth the primary, or 6 times the primary
IP traffic is one-fifth the primary, or 5 times the primary
IP traffic is one-fourth the primary, or 4 times the primary
IP traffic is two-sevenths the primary, or 3.5 times the primary
IP traffic is one-third the primary, or 3 times the primary
IP traffic is two-fifths the primary, or 2.5 times the primary
IP traffic is three-sevenths the primary, or 2.33 times the primary
IP traffic is one-half the primary, or 2 times the primary
IP traffic is three-fifths the primary, or 1.66 times the primary
IP traffic is two-thirds the primary, or 1.5 times the primary
IP traffic is three-fourths the primary, or 1.33 times the primary
IP traffic is four-fifths the primary, or 1.25 times the primary
IP traffic equals the primary
15–1
-M
UB
UX

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