Sun Microsystems SunHSI/S 3.0 Installation And Administration Manual page 7

The hsi_loop Command 34
Test Type Options 36
Test Option 1 - Internal Test 36
Test Option 2 - Test Using Loopback Plugs 36
Test Option 3 - Test Using Local or Remote Modem Loopback 36
Test Option 4 - Use Previously Set Mode 37
hsi_loop Output 38
The hsi_stat Command 39
SunVTS Diagnostic Testing 43
A. Building a Synchronous Null Modem Cable and an X.21-to-RS-449
Converter 45
Null Modem Cable Requirements 45
Configuring Internal or External Clocking 46
Building the Null Modem Cable 46
RS-449 Null Modem Cable 47
X.21-to-RS-449 Converter 50
RS-449 Implementation Example 51
RS-449 Pin Assignments and Descriptions 52
96-Pin Connector Signal and Pin Assignments 53
B. hsi_init Options for T1 Compatibility 57
Inverted Settings 58
Data Signal Inversion 58
Clock Signal Inversion
C. hsi_init Options for Operating Modes 61
HDLC Mode 61
IBM (SDLC) Mode 62
IBM Full-Duplex Mode 62
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