T1 is a physical layer protocol for leased line transmissions. T1 lines carry twenty-four (24) 56 kbps or 64 kbps channels at 1.544 Mbps. Most of these channels are used for voice and data circuits, while one is used for signaling and another is used for framing and maintenance. Originally developed by Bell Labs, the T1 protocol is the fundamental building block of the DS (digital signal) circuit classification, and is used in transmission networks in North America. Outside of North America, a similar protocol called E1 is used.
RAD T1 access product solutions support T1 access on the user ports and T1 access to the network. The T1 access product family includes routers, channel service units (CSUs), data service units (DSUs), network termination units (NTUs), multiplexers, digital cross connects, and many other devices. These solutions support multiple services over T1 access lines, as well as T1 access over a variety of uplinks, such as Ethernet, T3 and OC-3.
