Comtech-ef-data CDM-700 Instrukcja Użytkownika Pobierz pdf (Strona 37)

CDM-700 High Speed Satellite Modem Revision 5

Functional Description MN/CDM700.IOM

3.2 Interfaces Modules

The two interface slots and multi-port interfaces provide a simple way to use standard telecom

interfaces and to fill the gap in standard data rates between 52 and 155 Mbps by multiplexing data

streams together. The standard telecom interfaces are G.703, E3, T3, STS-1 and HSSI at the

lower end, and STM-1 or OC-3 at the top end, with a large unserved range between the two ends.

Module Description Mbps

CDI-10 Dual E3 / T3 / STS-1 G.703 Data Interface 34.368 / 44.736 / 55.184

CDI-50-1 OC-3 / STM-1 Single Mode and G.703 Coaxial Interface 155.52 (Fixed)

CDI-60 HSSI Interface 1.5 to 70

CDI-70 1000 Base-T Gigabit Ethernet Interface (GbEI) 1.5 to 155.52

Figure 3-1. CDM-700 Modem Block Diagram

Operating with multiple interfaces allows greater efficiency:

• The transponder operates with less backoff and at higher efficiency with a single-carrier

and this translates into higher throughput.

• Operating with a single carrier requires fewer modems than operating with multiple

carriers. The impact of one versus multiple modems in many applications is less of an

impact than the monthly transponder expense, but it is part of the overall ease of

operation.

For additional information see the applicable section in the manual for each interface.

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Comtech-ef-data CDM-700 Instrukcja Użytkownika Strona 37