Comtech EF Data Vipersat CDD-564L Manual de usuario descargar pdf (Pagina 5)

connectivity based on switching at the application level. On-demand mesh connection provides significant and dynamic connectivity

between remotes without the high costs associated with multiple carriers and/or 1-to-1 multi-receiver links.

Advanced Carrier Resizing

Traditional shared platforms such as TDM/TDMA networks provide a single type modulation/FEC scheme for their infrastructure. VMS in

conjunction with our highly efficient modems provide flexibility in setting modulation and FEC rates when establishing SCPC carriers. This

will allow you to leverage bandwidth on-demand and higher order modulation/FEC combinations to further optimize satellite links. For

example, a remote can be switched out of its home state of QPSK 3/4 and into 8PSK or 16-QAM 7/8 automatically based on pre-defined

policies.

IP-Based Network Control

All management operations and controls are accomplished using standard IP communications protocols. VMS uses a proprietary interface

to communicate with our IP-enabled modems that dramatically lowers monitor and control overhead compared to traditional SNMP

interfaces. The benefit is less bandwidth required and faster response to control and status messages.

Antenna Visibility Mapping

Antenna Visibility is a powerful tool to control the spectrum used by the VMS switching engine. It allows the operator on a site by site basis

to block portions of the satellite or transponder bandwidth from being used by the RF manager, even if a defined bandwidth pool exists

within the blocked portion.

There are many environments in which transmission jamming occurs. Whether it is a jamming carrier on the satellite or local interference

with a C-Band link, the ability to react in a timely matter is imperative. As the VMS is an automated satellite bandwidth manager, Antenna

Visibility Mapping allows you to define the affected satellite space segment to prevent any potential failures.

Point-to-Point Switching

A point-to-multipoint architecture does not always create the most efficient use of your satellite bandwidth. Situations like SOTM often

introduce variable link budgets for every node in the network. In this case you would have to size your TDM outbound to the worst

potential node, which can waste satellite resources. Point-to-point switching allows for dSCPC functionality in both directions, constantly

adjusting carriers creating the most optimal usage of the satellite bandwidth.

Over-The-Air Upgrades

Every Vipersat-enabled modem is upgradeable over-the-air. The upgrades are done via a proprietary protocol that allows for efficient

usage of bandwidth, eliminating the need for an IP accelerator. Multiple storage locations for firmware are on each modem, which allows

installation of all firmware upgrades on each unit before committing the new firmware. This creates an environment where minimal

downtime is required for network upgrades; the time it takes a device to reboot.

Dynamic Power Control (DPC)

Dynamic Power Control, though not a direct VMS feature, provides a mechanism whereby Vipersat satellite links have their transmit

power levels adjusted to optimize the receive signal quality (as measured by the demodulator Eb/N0). This optimization process acts to

either increase or decrease transmitted signal levels in order to:

 Achieve a minimum level of received Eb/N0 consistent with providing an error free link

 Reduce transmit power where sufficient link margin exists in order to optimize station uplink and satellite transponder power usage

DPC can be selectively enabled and disabled on a link-by-link basis for both point-to-point and point-to-multipoint links. DPC relies on the

passing of an IP message between the receive site (where the receive quality is being measured) and the transmit site (where the power

level is to be adjusted). These DPC packets are IP unicast messages. Only the transmit site that matches the frequency and network ID

number contained in the IP message will act on the message.

Multiple Switching Functions

VMS supports the below switching functions, many of which are generated within various in-band modems.

Manual Switching

 Operator Switch Request – Provides the ability to manually switch remote capacity as session-based services.

 Diagnostic Switching – Allows automatic switching to be disabled and carrier recovery mechanisms during test or antenna

commissioning periods.

Automatic Switching

 ToS Switching – Each remote modem monitors all packets and recognizes pre-defined DiffServ values to request additional capacity

per IP destination. Each of the 63 defined ToS values can have up to 128 destinations per entry with total overall of 128.

 Load Switching – Modems monitor WAN transmission buffer capacity fills, reporting changing conditions to central management

system to either increase or decrease satellite bandwidth usage.

 QoS Switching – Each remote modem monitors eight levels of packet queues, which are pre-defined rules (i.e., protocol,

source/destination IP, and source/destination port) and requests to be switched to pre-defined rates.

 Vipersat External Switching Protocol (VESP) Switching – Can be implemented in applications to provide full control of each

modem’s switch rate and duration.

 Near Hitless Switching – All In-Band modems have been optimized to account for the flight time of the packets over the air

(approximately 250 ms, on average) before moving the receiving demodulator. This provides for less overall packets disruption during

a switch.

 Advanced Switching – Remote modulators can be configured to change modulation and FEC combinations based on data rate

usage.

1 2 3 4 5 6

Comentarios a estos manuales

Sin comentarios

Comtech EF Data Vipersat CDD-564L Manual de usuario Pagina 5

Comentarios a estos manuales

Relacionado con productos y manuales para Redes Comtech EF Data Vipersat CDD-564L