Comtech EF Data SDM-2020 - Manual (Page 127)

SDM-2020 Satellite Modulator Revision 7
ECL/HSSI TX MN/SDM2020M.IOM
10-6
Table 10-3. HSSI/EIA-613 Interface Connector Pinout (J3)
Signal Function HSSI
Signal
EIA-613
Circuit
Pin # (+, -) Circuit
Direction
Comment
Loopback Circuit B LB 144 12, 37 to DCE Mod/Demod
Signal Ground SG 102 13, 38 Mod/Demod
TX PSYNC (See Note 1). TPSYNC undefined 14, 39 to DCE Modulator
TX DVALID (See Note 1). TDVALID undefined 15, 40 to DCE Modulator
Reserved (to DCE) 16, 41 unused
Reserved (to DCE) 17, 42 unused
Reserved (to DCE) 18, 43 unused
Signal Ground SG 102 19, 44 Mod/Demod
Carrier Detect (lock)
(See Notes 1 and 2).
CD undefined 20 from DCE Demodulator
Demodulator Fault
(See Notes 1 and 3).
DF undefined 45 from DCE Demodulator
Modulator Fault
(See Notes 1 and 3).
MF undefined 21 from DCE Modulator
Reserved (to DTE) 46 unused
RX PSYNC (See Note 1). RPSYNC undefined 22, 47 from DCE Demodulator
RX DVALID (See Note 1). RDVALID undefined 23, 48 from DCE Demodulator
Test Mode TM 142 24, 49 from DCE Mod/Demod
Signal Ground SG 102 25, 50 Mod/Demod
Notes:
1. Bold signal function names are non-HSSI defined signals. On Cisco routers there is
no connection to those pins. Refer to the Comtech EF Data web site for an
Application Note describing the use of the SDM-2020 with Cisco routers.
2. TTL - output.
3. TTL – open collector output.