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SunVTS 3.0 Test Reference Manual
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Appendix A Loopback Connectors

Loopback connectors are designed for the testing of communication ports. They take the form of either a single plug or a port-to-port cable with some communication connections shorted (looped-back).

Note -

Loopback connectors must be wired properly and connected firmly for the Serial Port tests to work correctly. Miswired, poorly soldered, or missing loopback connectors can cause erroneous diagnostic error messages.

The table below depicts the pin assignments for most loopback plugs and cables that may be used when testing a system.

Table A-1 Loopback Connector Pin Assignments

Signal Description 

EIA 

CCITT # 

RS-449 "A"  

RS-449 "B" 

DIN 8 8-pin round  

DB9 9-pin 

DB25 25-pin 

Direction 

Alpha ID 

Chassis/Frame Ground 

AA 

101 

1 

NC* 

NC* 

NC* 

1 

none 

AA 

Transmit Data (TxDa) 

BA 

103 

4 

22 

3 

3 

2 

output 

BA 

Receive Data (RxDa) 

BB 

104 

6 

24 

5 

2 

3 

input 

BB 

Request To Send (RTSa) 

CA 

105 

7 

25 

6 

7 

4 

output 

CA 

Clear To Send (CTSa) 

CB 

106 

9 

27 

2 

8 

5 

input 

CB 

Data Set Ready (DSRa) 

CC 

107 

11 

29 

NC* 

6 

6 

input/ output 

CC 

Signal Ground (SG) 

AB 

102 

19 

NC* 

4 

5 

7 

none 

AB 

Data Carrier Detect (DCDa) 

CF 

109 

13 

31 

7 

1 

8 

input 

CF 

Transmit Clock In (TRxCa) 

DB 

114 

5 

23 

NC* 

NC* 

15 

input 

DB 

Receive Clock in (RTxCa) 

DD 

115 

8 

26 

8 

NC* 

17 

input 

DD 

Data Terminal Ready (DTRa) 

CD 

108 

12 

30 

1 

4 

20 

output 

CD 

External Clock Out (TRxCa) 

DA 

113 

17 

35 

NC* 

NC* 

24 

output 

DA 

Secondary Data Carrier Detect (DCDb) 

SCF 

122 

NC* 

NC* 

NC* 

NC* 

12 

input 

SCF 

Secondary Clear to Send (CTSb) 

SCB 

121 

NC* 

NC* 

NC* 

NC* 

13 

input 

SCB 

Secondary Transmit Data (TxDb) 

SBA 

118 

NC* 

NC* 

NC* 

NC* 

14 

output 

SBA 

Secondary Receive Data (RxDb) 

SBB 

119 

NC* 

NC* 

NC* 

NC* 

16 

input 

SBB 

Secondary Request to Send (RTSb) 

SCA 

120 

NC* 

NC* 

NC* 

NC* 

19 

output 

SCA 

NC = No connection

25-Pin RS-232 Loopback Plug

The RS-232 and RS-423 single-port loopback plug is a specially wired male DB-25 connector. It is plugged in to a serial port in the back of the system under test. The wiring is shown in Figure A-1.

Figure A-1 25-pin RS-232 Loopback Plug

Grafik

25-pin RS-232 Port-to-Port Loopback Cable

Use these wiring instructions for 25-pin RS-232 and RS-423 port to 25-pin RS 232 and RS 423 port loopback cables (two DB-25 connections). It is plugged into a pair of serial ports in the back of the system under test. Both connectors are male. The wiring is shown in Figure A-2.

Figure A-2 25-pin RS-232 Port-to-Port Loopback Cable

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8-Pin to 8-Pin Loopback Cable

Use these wiring directions for 8-pin round DIN RS-232 port to RS-423 to 8-pin round-DIN RS-232 and RS-423 port loopback cable (see Figure A-3). Both connectors are male.

Figure A-3 8-Pin to 8-Pin Loopback Cable

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Pin 8, Receive clock In (DD), remains unconnected.

8-Pin Loopback Plug

Use these wiring directions for male 8-pin round-DIN RS-232 and RS-423 Single port loopback plugs (see Figure A-4).

Figure A-4 8-Pin Loopback Plug

Grafik

Pin 8, Receive Clock In (DD), remains unconnected.

25-pin Port A-to-Port B Loopback Plug

Use these wiring directions for a 25-pin Port A to Port B loopback plug for most systems (see Figure A-5).

Figure A-5 Port A-to-Port B Loopback Plug

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25-pin Port A-to-A Port B-to-B Loopback Plug

If your system has a single communication port to connect it to peripherals, use these wiring instructions for making a male 25-pin loopback plug for that communication port (see Figure A-6):

Figure A-6 Port A-to-A, Port B-to-B Loopback Plug

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96-Pin Female Loopback Connector

This 96-pin connector (see Figure A-7) can be ordered from Sun Microsystems (Part Number 370-1366).

Figure A-7 96-Pin Female Loopback Connector

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96-Pin Female Special Loopback Connector

This 96-pin connector (see Figure A-8) can be ordered from Sun Microsystems (Part Number 370-1381).

Figure A-8 96-Pin Female Special Loopback Connector

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37-Pin RS-449 Loopback Cable

Use these wiring instructions for a loopback cable for two 37-pin RS-449 synchronous ports (see Figure A-9).

Grafik
Figure A-9 37-Pin RS-449 Loopback Cable

Grafik

37-Pin RS-449 Loopback Plug

Use these wiring instructions for making a male 37-pin RS-449 loopback plug (see Figure A-10). This connector is also available from Sun (Part Number 530-1430).

Figure A-10 37-Pin RS-449 Loopback Plug

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9-pin Male Single-port Loopback Plug

Use these wiring instructions for male 9-pin RS-232 and RS-423 single-port loopback plugs (see Figure A-11):

Figure A-11 9-Pin Male Single-port Loopback Plug

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9-pin Female Single-port Loopback Plug

Use these wiring directions for female 9-pin RS-232 and RS-423 single-port loopback plugs (see Figure A-12):

Figure A-12 9-Pin Female Single-port Loopback Plug

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Note -

Use this loopback plug with the pcmciatest.

9-Pin to 25-Pin Port-to-Port Loopback Cable

Use these wiring instructions for a 9-pin RS-232 and RS-423 port to 25-pin RS-232 and RS 423 port loopback cables (see Figure A-13). Both connectors are male.

Figure A-13 9-Pin to 25-Pin Port-to-Port Loopback Cable

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9-Pin to 9-Pin Port-to-Port Loopback Cable

Use these wiring instructions for 9-pin RS-232 and RS 423 port to 9-pin RS-232 and RS-423 port loopback cables (see Figure A-14). Both connectors are male.

Figure A-14 9-Pin to 9-Pin Port-to-Port Loopback Cable

Grafik

Please note that this cable has no Sun part number assigned to it.

NT to TE Loopback Cable

Using two standard RJ45 connectors, and connect pin1 to pin1, pin 2 to pin 2, and so on, for all pins. This loopback is a "straight-through" connection.