The asynchronous family of adapters offers a wide variety of choices where distance topology is concerned.
The maximum cable lengths from the standard- and direct-attach adapters is generally the distance between the port and the asynchronous device, operating at the maximum specified data rate. The 128-port adapter is measured from the adapter card to the daisy-chained RAN attached to it. With the 128-port, unlimited distances can effectively be achieved by using the EIA 422 synchronous modems to attach the RANs to the adapter.
The distance from an Ethernet port on a system 7318 communications server is dependent on standard Ethernet wiring limitations. Depending on whether the server is 10BaseT, 10Base2, or 10Base5, and depending on the number of segments used, the distance can vary between 100 and 2500 meters.
Proper cabling is extremely important and is unique to each environment.