A P P E N D I X A |
Loopback Connectors |
Loopback connectors aid in testing communication ports. The connectors take the form of either a single plug or a port-to-port cable with some communication connections shorted (looped-back).
The following table depicts the pin assignments for most loopback plugs and cables that may be used when testing a system.
FIGURE A-1 shows the RS-232 and RS-423 single-port loopback plug, which is a specially wired male DB-25 connector. The plug is connected to a serial port in the back of the system under test. The following table lists the pin connections for connecting the first plug to the second plug:
FIGURE A-1 25-pin RS-232 Loopback Plug Wiring Diagram
FIGURE A-2 shows how to connect 25-pin RS-232 and RS-423 port to 25-pin RS 232 and RS 423 port loopback cables (two DB-25 connections). The cable is connected to a pair of serial ports in the back of the system under test. Both plugs are male. The following table lists the pin connections for connecting the first plug to the second plug:
FIGURE A-2 25-pin RS-232 Port-to-Port Loopback Cable Wiring Diagram
FIGURE A-3 shows how to connect 8-pin round DIN RS-232 port to RS-423 to 8-pin round-DIN RS-232 and RS-423 port loopback cables. Both plugs are male. The following table lists the pin connections for connecting the first plug to the second plug:
FIGURE A-3 8-Pin to 8-Pin Loopback Cable Wiring Diagram
Pin 8, Receive clock In (DD), remains unconnected.
FIGURE A-4 shows how to connect male 8-pin round-DIN RS-232 and RS-423 single-port loopback plugs. The following table lists the pin connections for connecting the first plug to the second plug:
FIGURE A-4 8-Pin Loopback Plug Wiring Diagram
Pin 8, Receive Clock In (DD), remains unconnected.
FIGURE A-5 shows how to connect a 25-pin Port A to Port B loopback plug for most systems. The following table lists the pin connections for connecting the first plug to the second plug:
FIGURE A-5 Port A-to-Port B Loopback Plug Wiring Diagram
If your system has a single communications port to connect it to peripherals, follow the connection instructions in FIGURE A-6 to make a male 25-pin loopback plug for that communication port. The following table lists the pin connections for connecting the first plug to the second plug:
FIGURE A-6 Port A-to-A, Port B-to-B Loopback Plug Wiring Diagram
FIGURE A-7 shows a 96-pin connector that can be ordered from Sun (part number 370-1366). The following table lists the pin connections for connecting the first plug to the second plug:
The following are the materials used for this plug:
FIGURE A-7 96-Pin Female Loopback Connector Wiring Diagram
This 96-pin connector can be ordered from Sun (part number 370-1381).
FIGURE A-8 96-Pin Female Special Loopback Connector Wiring Diagram
Use these wiring instructions for a loopback cable for two 37-pin RS-449 synchronous ports.
FIGURE A-9 37-Pin RS-449 Loopback Cable Wiring Diagram
Use these wiring instructions to make a male 37-pin RS-449 loopback plug. This plug is also available from Sun (part number 530-1430).
FIGURE A-10 37-Pin RS-449 Loopback Plug Wiring Diagram
Use these wiring instructions for male 9-pin RS-232 and RS-423 single-port loopback plugs.
FIGURE A-11 9-Pin Male Single-Port Loopback Plug Wiring Diagram
Use these wiring directions for female 9-pin RS-232 and RS-423 single-port loopback plugs. Use this loopback plug with the pcmciatest.
FIGURE A-12 9-Pin Female Single-Port Loopback Plug Wiring Diagram
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. Both connectors are male.
FIGURE A-13 9-Pin to 25-Pin Port-to-Port Loopback Cable Wiring Diagram
Use these wiring instructions for 9-pin RS-232 and RS 423 port to 9-pin RS-232 and RS-423 port loopback cables. Both plugs are male.
FIGURE A-14 9-Pin to 9-Pin Port-to-Port Loopback Cable Wiring Diagram
This cable has no Sun part number assigned to it.
Using two standard RJ-45 connectors, and connect pin 1 to pin 1, pin 2 to pin 2, and so on, for all pins. This loopback is a straight-through connection.
Use the following wiring instructions for standard RJ-45 connectors for Fast Ethernet. Use loopback cable in netlbtest for eri devices.
FIGURE A-15 Twisted-Pair Ethernet (TPE) Loopback Cable Wiring Diagram for Fast Ethernet
Use the following wiring instructions for RJ-45 plugs for Gigabit and 10/100 Ethernet. This loopback cable is used in netlbtest for Gigabit and 10/100 devices.
FIGURE A-16 TPE Loopback Cable Wiring Diagram for Gigabit and 10/100 Ethernet
Use the following wiring instructions for x86 platform RJ-45 serial port loopback plugs.
FIGURE A-17 x86 Platform RJ-45 Serial Port Loopback Connector
Use these wiring instructions for male 9-pin RS-232 and RS-423 single-port loopback plugs.
FIGURE A-18 9-Pin Male Single-Port Loopback Plug Wiring Diagram
Use these wiring directions for female 9-pin RS-232 and RS-423 single-port loopback plugs. Use this loopback plug with the pcmciatest.
FIGURE A-19 9-Pin Female Single-Port Loopback Plug Wiring Diagram
Use these wiring instructions for male 9-pin DB-9 external loopback plugs.
FIGURE A-20 9-Pin Male DB-9 External Loopback Connector Wiring Diagram
The signals and names for the DB-9 connector are as follows.
Use these wiring instructions for female 9-pin DB-9 external loopback connectors. Use this loopback connector with the netlbtest on x86 platforms.
FIGURE A-21 9-Pin Female DB-9 External Loopback Connector Wiring Diagram
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