Comtech EF Data Vipersat CDD-564L Manuel d'utilisateur télécharger pdf (Page 2)

Our efficient modem technologies combined with our VMS provide dynamic SCPC capacity management solutions. dSCPC facilitates

bandwidth sharing resulting in lower space segment operating costs. Efficient, low-latency and low-jitter SCPC connections can be

established, torn down, and dynamically resized manually or automatically. Vipersat dSCPC networks are comprised of Comtech EF Data

modulators, demodulators, and modems, which are centrally controlled by the VMS to provide dynamic bandwidth management. VMS is

scalable, designed to accommodate future growth, and is capable of managing various network configurations.

A variety of Comtech EF Data modems, modulators, demodulators and routers are manageable by the VMS. Different bandwidth saving

features and capabilities are supported depending on the modem or terminal type. The modem or terminals that are manageable by the

Vipersat VMS fall into two categories, In-Band and Out-of-Band management.

In-Band Management

In-Band modems are those which have a Vipersat or dSCPC feature activated. These

IP-based modems are capable of automatic dSCPC through internal detection

mechanisms. The VMS manages and controls these modems “in-band”, through the

same IP interface that user data is carried. The IP capability of In-Band managed

modems allows for a wide variety of dSCPC switching methods.

Out-of-Band Management

Out-of-band managed modems are typically used for point-to-point SCPC circuits that

require connections using non-IP G.703, ASI, HSSI, V.35, high-speed Gigabit

Ethernet, etc. interfaces. The VMS has the ability to monitor and control these

modems through their 10/100/1000Base-T M&C interfaces. The management

interface is separate from the primary user baseband interface; therefore, IP

connectivity to the management interface is typically provided “out-of-band” using a

separate IP-based connection. These modems allow for manual and scheduled

dSCPC switching only.

Dynamic Single Channel per Carrier (dSCPC)

Traditional Single Channel per Carrier satellite communication links do not change. As

link budgets and network throughput requirements are based on the worst case

scenario, these links are often underutilized.

With increasing satellite bandwidth costs combined with increasing throughput requirements, you are looking for the most efficient

utilization of your operating budget. Dynamic Single Channel per Carrier provides increased efficiency in bandwidth utilization, carrier

management, as well as personnel required to manage the network.

Altering a link typically requires substantial resources on both sides of the link. An analysis must be done to determine what new data rate

the modem will require to be optimized for the network traffic load. A new link budget must be performed, including power calculations. A

new frequency plan must be created, often requiring changes to multiple sites to accommodate the change. Finally, personnel must be

located at both sides of every link involved simultaneously in order to reduce outage time. Leveraging dSCPC enables automation of the

above.

When a node in the satellite network detects a change in the amount of throughput required via several automatic detection algorithms, it

will automatically request that change from the VMS. The VMS will look at all satellite resource allocations and automatically determine a

new frequency plan, power level, data rate, FEC, and modulation schemes for all modulators and demodulators involved in the change.

All associated devices will simultaneously be sent these parameters over the air without human intervention. These calculations are done

in fractions of a second with the entire process taking less than one second of total data loss in most cases.

dSCPC yields true bandwidth-on-demand, providing low-latency, low-jitter dedicated SCPC connections when needed for real-time

applications, such as Voice over IP (VoIP), video conference, broadcasts and large applications (file or image transfers).

At any time, the operator has full manual override ability, and can turn on/off the auto-detection mechanisms.

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Comtech EF Data Vipersat CDD-564L Manuel d'utilisateur Page 2

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