Comtech EF Data CDM-600 Uživatelský manuál stáhnout pdf (Strana 4)

IP Module &

VMS Integration

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INTRODUCTION

With an innovative architecture to support IP networking, an

IP-Module equipped CDM-570 and CDM-570L meets many

customer requirements for Point-to-Point and Point-to-Multi-

Point applications. When configured with the IP Module, the

modems provide advanced features for improving satellite link

efficiency in IP networks:

STANDARD FEATURES

• easyConnect™ for set up with minimal configuration

• Static IP routing for unicast and multicast

• Powerful network management via SNMP, Web, or Telnet

• IGMP v1 and v2

• Symmetric as well as asymmetric operation for maximum

bandwidth efficiency

• Point-to-Point or Point-to-Multi-Point configuration

OPTIONAL FEATURES

• Header Compression (IP/TCP and IP/UDP/RTP)

• Payload Compression

• 3x DES Data Encryption

• Quality of Service (QoS)

HEADER COMPRESSION OPTION

Configurable on a per route basis, header compression reduces

the required Voice over Internet Protocol (VoIP) bandwidth by

as much as 60%. Example: A G.729 voice codec, operating at

8 kbps, will occupy 32 kbps once encapsulated into IP framing

on a LAN. Using IP/UDP/RTP Header Compression, the same

traffic only needs 10.8 kbps total WAN satellite bandwidth to

cross the link. Normal Web/HTTP traffic can be reduced an

additional 10% via IP/TCP header compression.

PAYLOAD COMPRESSION OPTION

Compressing payload reduces both the data frame size and

satellite bandwidth required to transmit across the link.

Configurable on a per route basis, Payload Compression

optimizes traffic and reduces bandwidth up to 40%.

DATA ENCRYPTION OPTION

The IP Module provides 3xDES data encryption to prevent

unauthorized access to data over the satellite link, and is

configurable on a per route basis.

QUALITY OF SERVICE OPTION

The IP Module supports multi-level QoS to reduce jitter and

latency for real time traffic, provides priority treatment to

mission critical applications and allows non-critical traffic to use

the remaining bandwidth. Three modes are available,

Max/Priority, Min/Max and DiffServ.

• Max/Priority - Assign a maximum bandwidth that any traffic

flow can utilize combined with 8 levels of prioritization

• Min/Max - Set the minimum and maximum bandwidth for user-

defined classes of traffic to ensure that a certain level of

bandwidth is always applied

• DiffServ – Provide higher priority to some applications over

others; Industry-standard method of adding

network-wide QoS enabling seamless co-existence in

networks that already have DiffServ

NETWORKING PROTOCOLS

RFC 768 – UDP RFC 2045 – MIME

RFC 791 – IP RFC 2236 – IGMP v2

RFC 792 – ICMP RFC 2474 – Diffserv

RFC 793 – TCP RFC 2475 – Diffserv

RFC 826 – ARP RFC 2578 – SMI

RFC 856 – Telnet RFC 2597 – AF PHB

RFC 862 – Ping RFC 2598 – Expedite Forwarding

RFC 894 – IP RFC 2616 – HTTP

RFC 959 – FTP RFC 2821 – SMTP

RFC 1112 – IP Multicast RFC 3412 – SNMP

RFC 1213 – SNMP MIB II RFC 3416 – SNMPv2

RFC 1812 – IPv4 Routers RFC 3418 – SNMP MIB

OPERATIONS & MAINTENANCE

Configuration and management

Console interface

SNMP with MIB II and private, modem-specific MIB

Telnet

HTTP

Software/firmware (IP Module) upgrade via FTP

Traffic management statistics

Faults and alarms

Configuration backup and restoral

SECURITY

Password Protection

Access List

CONSOLE PORT

Interface

EIA-232 (RJ-12 connector)

REMOTE PORT

Interface

EIA-232 or EIA-485 (2- or 4-wire)

VMS NETWORK & BANDWIDTH MANAGEMENT

Vipersat Networks’ VMS provides traditional monitor and control

functions more efficiently than other M & C protocols, and allows

enhanced capacity and bandwidth management capabilities for

the modems. VMS gives satellite service providers and

enterprise operators the ability to dynamically adjust bandwidth

based on application, load or schedule.

VMS also allows the modems to switch from shared to dedicated

mode. Inbound transmissions from remotes can be switched

from a shared Selective Time Division Multiple Access (STDMA)

mode to a dedicated Single Carrier Per Channel (SCPC)

connection manually or automatically, triggered by application or

load, or on a scheduled basis. This enables the network to more

effectively handle connection-oriented applications and reduces

both latency and network congestion. Through VMS, dynamic

point-to-point mesh connections can be established between

remotes. The result is an economical and flexible network,

enabling bandwidth to be shared and directed where it is

needed for any mix of IP voice, video or data traffic.

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