Functional Description - Comtech EF Data CDM-570A Installation And Operation Manual

•
The CDM-570A/570AL may be equipped with the optional High-Performance Packet
Processor card for 10/100 BaseT Ethernet operation that, in addition to providing Layers
3-5 functionality, incorporates a number of key features for Wide Area Network (WAN)
bandwidth optimization: very low overhead High-level Data Link Control (HDLC); Header
and Payload Compression; Advanced Quality of Service (QoS); and Triple DES (3XDES)
Encryption.
•
The CDM-570A/570AL offers variable data rates from 2.4 kbps to 10.239 Mbps, in
BPSK, QPSK, Offset QPSK, 8-PSK, 8-QAM, 16-QAM modes.
•
The CDM-570A/570AL supports an entirely new family of waveforms - VersaFEC-2
(both short and long block Low-density Parity Check Coding (LDPC)) with variable data
rates in BPSK, QPSK, 8-ARY, 16-ARY, and 32-ARY modes.
•
The CDM-570A/570AL provides, as Forward Error Correction (FEC) options: Viterbi,
concatenated Reed-Solomon (R-S), Trellis Coded Modulation (TCM), Turbo Product
Coding (TPC, IESS-315 compliant), ULL (Ultra Low Latency), VersaFEC
low latency LDPC), and VersaFEC-2.
•
The CDM-570A/570AL provides a full range of built-in interface types, including G.703
T1 and E1 and, when the modem is equipped with the optional Packet Processor,
Ethernet.
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The CDM-570A/570AL is compact – it is 1RU high, with a depth of 16 inches for the
CDM-570AL, 11 inches for the CDMR-570AL Reduced Chassis Depth unit, and 13.13
inches for the CDM-570A.
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The CDM-570A/570AL features a front panel Vacuum Fluorescent Display (VFD), and
six-button keypad for local Monitor and Control (M&C).
•
The CDM-570A/570AL features an integrated 10/100 BaseT Ethernet interface for
network-based remote product M&C – including SNMP, HTTP (non-secure Web server),
and Telnet.
•
The CDM-570AL supports external Block Up Converters (BUCs) and Low-noise Block
Down Converters (LNBs). An optional BUC power supply, either 90 Watts or 150 Watts
@ 50°C, may be installed internally. 10 MHz reference signals are available to drive both
BUC and LNB. LNB power and Frequency Shift Keying (FSK) for 'smart' BUCs is
standard.
1.1.2

Functional Description

The modem has two fundamentally different types of interface – IF and data:
•
The IF interface provides a bidirectional link with the satellite via the uplink and downlink
equipment.
•
The data interface is a bidirectional path that connects the modem (assumed to be the
Data Circuit-terminating Equipment (DCE)) to the customer's equipment (assumed to be
the Data Terminal Equipment (DTE)).
Transmit data is received by the terrestrial interface where line receivers convert the clock and
data signals to CMOS levels for further processing. A small First In First Out (FIFO) follows the
terrestrial interface to facilitate the various clocking and framing options. If framing is enabled, the
transmit clock and data output from the FIFO pass through the framer, where the Embedded
Distant-end Monitor and Control (EDMAC) overhead data is added to the main data; otherwise,
the clock and data are passed directly to the FEC encoder.
Introduction
CDM-570A/570AL Satellite Modem with Optional Packet Processor
1–2
Revision 5
®.
®
(a short-block,
MN-CDM570A