Comtech EF Data CDM-625 Manual de usuario descargar pdf (Pagina 3)

Packet Processor

The optional high-performance Packet Processor enables efficient IP networking and transport over satellite with low overhead

encapsulation, header compression, payload compression and advance Quality of Service to the CDM-625A. The QoS combined with

header and payload compression ensures the highest quality of service with minimal jitter and latency for real-time traffic, priority

treatment of mission critical applications and maximum bandwidth efficiency.

Packet processor supports Routed mode as well as Managed Switch Mode of operation. In managed switch mode, it operates as a

layer 2 switch with VLAN support, enabling seamless integration with existing infrastructure while providing full optimization including

low overhead Streamline Encapsulation, header compression and payload compression and advanced QoS.

Header Compression

The Packet Processor incorporates industry-leading header compression for Ethernet and IP traffic. In managed switch mode, header

compression can reduce the 54 byte Ethernet/IP/UDP/RTP header to as little as 1 byte. For TCP/IP, the 54 byte header (including

Ethernet) is reduced to as little as 3 bytes. For applications such as VoIP, header compression can provide bandwidth savings

exceeding 65%. E.g. the 8 kbps G.729 voice codec requires 31.2 kbps once encapsulated into an Ethernet frame with IP/UDP/RTP.

With header compression, the same voice call needs about 9 kbps – a saving of almost 70%. And, bandwidth requirements for typical

Web/HTTP traffic can be reduced by 10% or more with TCP/IP header compression.

Payload Compression

The Packet Processor incorporates industry-leading GZIP based payload compression for IP/Ethernet traffic. Implemented in hardware

for maximum throughput and efficiency, payload compression can typically reduce the required satellite bandwidth by 30-40%.

Streamline Encapsulation (SLE)

The Packet Processor incorporates Comtech EF Data’s patent-pending low overhead Streamline Encapsulation (SLE). SLE can reduce

the encapsulation overhead by as much as 65% compared to industry standard HDLC.

Advanced Quality of Service (QoS)

The Packet Processor incorporates multi-level QoS to ensure the highest quality service with minimal jitter and latency for real-time

traffic, priority treatment of mission critical applications and maximum bandwidth efficiency. Supported modes are:

• DiffServ – Industry-standard method of providing QoS enabling seamless co-existence in networks that implement DiffServ

• Max/Priority – Provides traffic prioritization with the ability to limit maximum traffic per priority class

• Min/Max – Provides a Committed Information Rate (CIR) to each user defined class of traffic with the ability to allow a higher

burstable rate depending on availability

A powerful classifier supports packet classification by Protocol, VLAN ID / range, ToS Byte, Source IP (or subnet), Destination IP (or

subnet), Source Port (or Range), Destination Port (or Range) and DSCP (for DiffServ).

Quad E1 Interface (QDI) with Enhanced D&I++

The CDM-625A supports a Quad E1 interface that can aggregate up to four full or fractional E1s into a single carrier, with very low

overhead. This provides significant CAPEX savings by reducing the number of modems and could possibly reduce the BUC/HPA size

by eliminating the multi-carrier backoff. A proprietary, closed network drop & insert (D&I++) allows for dropping or inserting any

combination of 1 to 31 time slots on each E1. D&I++ is supported for E1-CCS only.

IP Sub Multiplexer

The IP sub mux allows multiplexing IP/Ethernet traffic with serial or G.703 traffic into a single carrier. This is particularly useful for

cellular backhaul when both E1 and IP backhaul is required. This reduces the number of modems and could possibly reduce the

BUC/HPA size by eliminating the multi-carrier backoff. The IP sub mux ratio ranges from 9:1 (IP data rate is 9 times that of the serial or

G.703 data rate) to as low as 1:59. IP sub mux can also be used to provision an overhead IP channel for management when using non

IP/Ethernet traffic interfaces.

EDMAC & AUPC

The CDM-625A supports EDMAC, EDMAC-2, EDMAC-3 and AUPC. EDMAC/EDMAC-2/EDMAC-3 can be used to monitor and control

the distant end of a satellite link using a proprietary overhead channel. EDMAC-3 is also used for SNMP management of the distant

end modem. AUPC automatically adjusts modem transmit power based on feedback from the distant end modem to maintain the

desired Eb/No. AUPC and EDMAC are supported for point-to-point duplex links.

Management & SNMP Proxy

The modem can be managed via the front panel, the remote M&C port (EIA-232/EIA-485), or the 10/100Base-T Ethernet port. With

support for SNMP, HTTP and Telnet, the modem can be easily integrated into an IP-based management system.

The CDM-625A can also act as SNMP proxy for the distant end CDM-625A. This allows distant end CDM-625A management using

SNMP without requiring an end-to-end IP link.

RADIUS Client

The CDM-625A supports the Remote Authentication Dial In User Service (RADIUS) client enabling centralized user authentication for

management access to the modem by web browser and telnet. RADIUS client supports Password Authentication Protocol (PAP) and

Challenge-Handshake Authentication Protocol (CHAP).

IEEE 1588v2 Precision Time Protocol (PTP)

PTP has emerged as the key technology for frequency, time and phase synchronization over a packet network. The CDM-625A

incorporates hardware support for PTP, thereby significantly improving synchronization accuracy for satellite backhaul.

Advanced FSK for LPOD Monitoring & Control

The Advanced FSK allows for monitoring and control of LPOD through modem front panel menus, serial remote control and Telnet.

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