Table of Contents
Advertisement
Data Interfaces
1.
2.
3.
HSSI (High Speed Serial Interface per Cisco Systems, Inc.) and EIA-613 (High Speed
Serial Interface for Data Terminal Equipment and Data Circuit-Terminating Equipment)
specifications define the high speed serial port functionality. The serial port will be
referred to as the HSSI Interface. The HSSI Interface is compatible with
EIA-613/EIA-612.
Additional non-standard signals will be included on reserved pins and are highlighted in
the signal definition table.
Note: Standard EIA-613 defines the interconnection of data terminal equipment (DTE)
and data circuit-termination equipment (DCE) utilizing high speed serial circuits. The
SDM-2020 modulator/demodulator is defined as a DCE. Figure A-12 shows the HSSI
signal flow and naming convention for defined signals.
A–32
Bold signal function names are non-HSSI defined signals. On Cisco routers there
is no connection to those pins. Reference the Comtech EF Data web site for an
Application Note describing the use of the SDM-2020 with Cisco routers.
TTL - output.
TTL - open collector output.
PIN 1
PIN 26
PIN 25
PIN 50
Figure A-11. ECL/HSSI Connector, Pin Location
SDM-2020 Satellite Demodulator
PIN 25
PIN 50
PIN 1
PIN 26
Rev.3
Advertisement
Table of Contents
