技术在快速发展进步。因此，我们建立了易于使用的术语汇编，帮助您更好地了解影响您业务的术语、技术和趋势。
A digital carrier signal that transmits the DS – 1 signal over copper. It is a North American standard It has a data rate of about 1.544 megabits / second. It contains twenty four digital channels and hence requires a device that has digital connection. Over Sonet it is an optical connection
