### Configuring C/X and EPC/X Synchronous Lines

While using the configuration utilities for the C/X and EPC/X products, you are asked to set values for the synchronous Line between the adapter and the concentrators.

If you are using the cables that come with the concentrators, and are cabling locally only, you should choose 8-wire, Internal, and leave the maximum line speed at the rate presented by the program.

Otherwise, to determine the values to use, keep these general notes in mind:

- Line speed refers to the rate at which data can be sent over the cables connecting the components, without compromising signal strength. It is inversely proportional to the length of the line over which signals are sent. The longer the line, the lower the speed.

- Wiring mode refers to the number of wires used in the cable. For longer distances, four wires is more economical, but the maximum transfer rate is lower because clock signals are not used. The cables that come with the adapter and concentrators are eight wire.

- For the Host Adapter Sync Line Speed setting, you should choose a value based on the total length of cable from the adapter to the last concentrator, according to the following:

  C/X adapters
  1000 feet | up to 1.2M bps
  2000 feet | up to 460K bps
  EPC/X adapters
  30 feet | up to 10M bps
  120 feet | up to 5M bps
  300 feet | up to 2.5M bps
  1000 feet | up to 1.2M bps
  2000 feet | up to 460K bps

- The Concentrator Sync Line Speed value is automatically set by the utility to the highest value available for the wiring mode. In most cases this value is the right one to use.

- Choose External clocking only if you will be using a modem to remotely communicate between the adapter and a concentrator.