Cables and Connectors
HSSI Null Modem Cable
116
HSSI Null Modem Cable
The following table shows the HSSI Null Modem pinout.

Signal Name From Pins Direction To Pins Signal Name

RT (Receive Timing) 2, 27 —> 9, 34 TT (Terminal Timing)
CA (DCE Available) 3, 28 —> 8, 33 TA (DTE Available)
RD (Receive Data) 4, 29 —> 11,36 SD (Send Data)
LC (Loopback C) 5, 30 —> 10, 35 LA (Loopback A)
ST (Send Timing) 6, 31 —> 6, 31 ST (Send Timing)
TA (DTE Available) 8, 33 —> 3, 28 CA (DCE Available)
TT
(Terminal Timing) 9, 34 —> 2, 27 RT (Receive Timing)
LA (Loopback A) 10, 35 —> 5, 30 LC (Loopback C)
SD (Send Data) 11, 36 —> 4, 29 RD (Receive Data)
GND (Ground) 1, 26, 7, 32, 13,
38, 19, 44, 25,
50
1, 26, 7, 32, 13,
38, 19, 44, 25,
50
GND (Ground)
Loopback (Not
Connected) 12, 37 12, 37 Loopback
(Not Connected)
Not Used 14–18, 20–24,
39–43, 45–49 14–18, 20–24,
39–43, 45–49 Not Used

Table A-2: HSSI Null Modem Cable Pinout