Comtech EF Data SDM-2020 - Manual (Page 122)

10-1
Chapter 10. ECL/HSSI
DATA INTERFACE
10.1 G
ENERAL
The following paragraphs describe the ECL/HSSI interface. This plug-in module
provides the physical and electrical interface between an SDM-2020 Modulator or
Demodulator and a serial ECL signal source operating with TIA/EIA-612
electrical characteristics.
10.1.1 A
PPLICABLE
D
OCUMENTS
DBS-PS-007 DBS Development and Fabrication Project
ETS 300 421 Digital broadcasting systems for television, sound and data
services
TM1449 Interfaces for CATV / SMATV Headends and Similar
Professional Equipment, 10th Working Draft
TIA/EIA-612 Electrical Characteristics for an Interface at Data Signaling
Rates up to 52 Mbit/s (HSSI)
TIA/EIA-613 High Speed Serial Interface for Data Terminal Equipment
and Data Circuit-Terminating Equipment (HSSI)
Cisco HSSI spec HSSI High Speed Serial Interface Design Specification, Rev.
3.0
ISO/IEC DIS 13818-1 Coding of moving pictures and associated audio
10.1.2 D
ESCRIPTION
The ECL/HSSI data interface is a plug-in option that is field-installed from the rear of the
SDM-2020 chassis, and provides the Modulator and Demodulator with an emitter
coupled logic (ECL) serial data electrical interface.
This document defines the SDM-2020 Modem Interface along with the ECL/HSSI
Interface as the DCE (Data Communications Equipment), and the Terrestrial (user data
interface) as the DTE (Data Terminal Equipment). Transmit data enters the ECL/HSSI
Interface and received data exits it.