Comtech EF Data SDM-2020 - Manual (Page 153)

10–1
Chapter 10. ECL/HSSI
INTERFACE
This section describes the plug-in ECL/HSSI Data Interface used with the SDM-2020
Demodulator.
10.1 ECL/HSSI Interface (PL/5806-3)
IMPORTANT
The ECL/HSSI interfaces for the Modulator (PL/5806-2) and
Demodulator (PL/5806-3) are not interchangeable.
The ECL/HSSI interface is compliant with TIA/EIA-612 and -613. It operates from a
-5 VDC supply and is compatible with routers that support the HSSI interface. The
interface has functional signals similar to a serial EIA-422 interface but operates at much
higher data rates. The connector is a 50 pin female SCSI-2 type and includes the open
collector fault lines for reporting a failure to external equipment like a redundancy
switch.
The -1 interface is used for the modulator and the -2 for the demodulator. The interface is
not interchangeable between the modulator and demodulator.