You will also not find any termination resistors on the backbone wiring. This is rarely a problem, as most J1708 networks consisted of no more than 4 ECMs (Engine, Transmission, ABS, & Cab Controller). There can also be a maximum of 20 ECMs, or “nodes”, on the J1708 network. Data on the J1708 moves at 9600 bits per second, which is much slower than today’s modern J1939 network. The J1708 network itself is very slow compared to today’s standards. There is also the standard of requiring 1 twist per inch of cable. The wiring itself is done in a 2-wire twisted pair of 18-gauge wires that can run up to 130 feet in length. The wiring for the datalink itself is not too terribly complicated. The J1708 network was the first real industry-wide accepted standard for commercial trucks. This is the primary protocol found on the 6-pin diagnostic connectors that were used from the early 1990s to the mid-2000s. In this post, we are going to get more in-depth on the J1708 datalink, also referred to as J1587. If you aren’t familiar with truck datalinks, we suggest you read our post regarding the Introduction to Truck Datalinks.
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