Joint Test Action Group (JTAG) was developed in the 1980s and refers to an integrated testing method for making connections on printed circuit boards (PCBs). JTAGs are implemented at the integrated circuit (IC) level. JTAG cables allow users to test connections between integrated circuits on PCBs without needing to use physical test probes. JTAGs result in shorter test times, higher test coverage and improved testing capability at a lower cost. You can test the performance of your Motorola Surfboard modem with a JTAG.
- Skill level:
- Moderately Challenging
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Things you need
- Surfboard modem
- JTAG cable
- Port connector
- JTAG adaptor
Examine the JTAG cable and the end of your modem's connections. Locate six connections or pins on the modem's connector front component side. The pin positions move from one through 10, starting in the bottom, right corner and moving up from left to right. Locate similar pins numbering one through 10 on your router. Locate the coloured, flexible cables on your JTAG (red, yellow, green, blue, white and black).
Locate the D6 position on your PC by counting up from the bottom, right hole, which is number one; the hole directly above it is D2, the position above that is D3 and so on up to D6, which is the sixth hole from the bottom, right side. Connect one end of the red, flexible cable to D6 on your PC and the other end to pin position one on your modem. The rest of the connections will be made to your Internet router.
Insert one end of the yellow, flexible cable to the D7 position (located directly above D6 position) on your PC and the other end to pin position seven on your router. Insert one end of the green, flexible cable to D8 on your PC and the other end to pin position three on your router. Insert one end of the blue, flexible cable to D9 on your PC and the other end to pin position nine on your router. Insert one end of the white, flexible cable to D11 on your PC and the other end to pin position five on your router. Insert one end of the black, flexible cable to "GND" which is an abbreviation for "Ground" and is located on the bottom, left of your PC; connect the other end to pin position two, four, six, eight and 10 on your router.
Connect the universal JTAG adaptor into your port connector's parallel port and turn on the modem.
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