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Cable modem termination system A cable modem termination system ( CMTS , also called a CMTS Edge Router ) [ 1 ] is a piece of equipment, typically located in a cable company's headend or hubsite, which is used to provide data services, such as cable Internet or Voice over IP , to cable subscribers.
The modem also provides handshake protocols, so that the devices on each end of the connection are able to recognize each other. [6] However, a modem generally provides few other network functions. A USB modem plugs into a single PC and allows a connection of that single PC to a WAN. If properly configured, the PC can also function as the ...
Xfinity Voice (formerly Comcast Digital Voice) is a Voice Over IP cable telephony service that was launched in 2005 in some markets, [75] and to all of Comcast's markets in 2006. Comcast's older service, Comcast Digital Phone, continued to offer service for a brief period, until Comcast shut it down around in late 2007. [ 76 ]
Data mode in which the modem sends the data to the remote modem. (A modem in data mode treats everything it receives from the computer as data and sends it across the phone line). Command mode in which data is interpreted as commands to the local modem (commands the local modem should execute).
The modem connects to a single computer or router, through an Ethernet port, USB port, or is installed in a computer PCI slot. The more common DSL router is a standalone device that combines the function of a DSL modem and a router , and can connect multiple computers through multiple Ethernet ports or an integral wireless access point .
When the modem wants to tell the host about these, it sends a DLE byte, plus a (usually) 1-byte message describing the event. The list of supported events varies by modem, but usually a digit (as well as * and #) mean touch-tones pressed, and the letter "s" means silence detected.
The modem allowed digital data to be transmitted over regular unconditioned telephone lines at a speed of 110 bits per second (bit/s). In 1959, Christopher Strachey filed a patent application for time-sharing in the United Kingdom and John McCarthy initiated the first project to implement time-sharing of user programs at MIT.
Unix-like operating systems usually label the serial port devices /dev/tty*. TTY is a common trademark-free abbreviation for teletype , a device commonly attached to early computers' serial ports, and * represents a string identifying the specific port; the syntax of that string depends on the operating system and the device.