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Figure 4-1 10Base-T network cable tester transmitter.
D1 P3
R8 R9 R10 R11 R12 R13 R14 R9 R10 R11 R12 R13 R14 R15
Figure 4-2 10Base-T network cable tester receiver.
PROGRAMMING THE CABLE TESTER 67
connector is wired to the series resistors from the outputs of the STAMP 2. A mating 8-pin male connector is wired by an 8-ft length of CAT5/CAT8 cable to an RJ-45 Ethernet connector plug at the opposite end of the cable. A power switch and power indicator LED are mounted on the front of the chassis box. An alternative cable could be constructed with an 8-pin male connector at one end and, at the opposite end of the cable, each individual wire would be brought out to separate alligator clips, used to test circuits without an RJ-45 connector. The prototype of the 10Base-T receiving unit is housed in a small 3- by 5-in plastic chassis box. Seven LEDs are mounted on the front of the enclosure. A series resistor is connected to each LED to prevent the LEDs from drawing excessive current and burning out prematurely. An 8-pin female miniconnector is mounted to the outside of the receiving unit chassis box. You will need to make up another cable, using a length of CAT5/CAT8 Ethernet cable. At one end of the cable, solder a mating 8-pin male miniconnector and at the opposite end of the cable you will need to attach an RJ-45 plug. Constructing RJ-45 patch cables can be simplified by referring to Table 4-1, which illustrates the color pair combinations for standard straight through Ethernet cable. Table 4-2 depicts a color-coded wiring chart for cross-over ethernet cables.
Programming the Cable Tester
Once both the sender and receiver sections of the 10Base-T cable tester have been completed, you can move on to loading the software into the new 10 Base-T network cable tester. First, you will need to connect up your newly made programming cable between the sending unit and your personal computer. Next, you will need to locate the Windows editor for the STAMP 2, titled STAMPW.EXE. Once the editor is running, and your programming cable is attached, apply power to the STAMP 2 microprocessor. Next, locate and download the CABTEST.BS2 software (Listing 4-1 on p.69) needed to animate the 10Base-T network cable tester. Finally, run the program and you re ready to begin using your new network cable tester. Most 10Base-T systems incorporate an RJ-45 patch panel at the computer switch/server side, so the above arrangement will work very well. In some instances, where no patch panel is used on the switch/server side, you could still use the cable tester but you would need to make a cable from the STAMP 2 sender with clip leads; the problem with this method is that you will have to pay strict attention to color codes used for each wire, since you are not using the standard RJ45 connector with its wiring sequence and conformity. The 10Base-T network cable tester will be a welcome addition to your test gear. You will wonder how you did wiring without it.
10Base-T Network Cable Tester Parts List
U1 R1, R2, R3, R4, R5, R6, R7 R9, R10, R11, R12, R13, R14, R15 BASIC STAMP 2 (original) 501501/4-W resistor 1/4-W resistor
68 10BASE-T NETWORK CABLE TESTER
R8 D1, D2, D3, D4 D5, D6, D7, D8 S1 S2 J1 P1 P2, P3 Battery Miscellaneous
330 LEDs LEDs
1/4W resistor
SPST toggle power switch Normally open SPST pushbutton switch 4-pin 0.010-in female header 4-pin 0.010-in male header RJ-45 8-pin 10Base-T connectors 9-V transistor radio battery 24-pin DIP socket, header, wire, PC board, battery clip, CAT5/CAT8 cable, alligator clips, etc.
TABLE 4-1 RJ-45 PIN NO.
STRAIGHT THROUGH ETHERNET CABLE WIRING CHART COLOR (BOTH SIDES IDENTICAL)
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
White with orange Orange White with green Blue White with blue Green White with brown Brown
TABLE 4-2 RJ-45 PIN NO.
CROSSOVER ETHERNET CABLE WIRING CHART SIDE 1 COLOR SIDE 2 COLOR
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
White with orange Orange White with green Blue White with blue Green White with brown Brown
White with green Green White with orange Blue White with blue Orange White with brown Brown
10BASE-T NETWORK CABLE TESTER PARTS LIST 69
'Cabtest.bs2 DIRA=%1111 DIRB=%1111 DIRC=%0000 DIRD=%0000
Top: OUTA=%0000 OUTB=%0000
pause 2000 OUT0=1 pause 300 OUT1=1 pause 300 OUT2=1 pause 300 OUT3=1 pause 300 OUT4=1 pause 300 OUT5=1 pause 300 OUT6=1 pause 300 OUT7=1 pause 300
OUTA=%0000 OUTB=%0000
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