Serial

Because X can run over any reliable octet-stream interface, X can be used over a serial line. X may be used where one or more of the following is true:

• bandwidth requirements are low
• installing higher bandwidth cabling is infeasible
• the user is mobile or at a remote site
• public voice-grade lines are the only available networking option

• data transfer is over public lines or over interceptable cellular channels
• encrypting modems are not widely used
• serial cables are easy to tap
• service quality over public networks degrades quickly under load