Transcription of Digital Telephony overview - Hermon Laboratories
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Digital Telephony overview - Hermon Laboratories
Digital T1 and E1 Interfaces Compliance Requirements overview 1 Digital T1 and E1 Interfaces Compliance Requirements overview T1 is a Digital transmission link with a total transmit and receive rate of Mbps (1544000 bits per second). E1 is a Digital transmission link with a total transmit and receive rate of Mbps (2048000 bits per second). T1 is used in North America and Asia and E1 is used in Europe and Australia. T1 and E1 links enable simultaneous transmission and receiving of several data or voice channels or of unchannelized raw bit stream. A T1 line uses two balanced pairs of copper wire. One pair is used for transmitting (Tip-Ring) and another pair for receiving (Tip1-Ring1). The nominal impedance of each transmit and receive pair is 100 ohm. An E1 interface uses the same type of line as T1 but has the nominal impedance of 120 ohm. There are also 75 ohm coax (unbalanced) E1 lines.
Digital T1 and E1 Interfaces Compliance Requirements Overview 2 network node and terminal equipment, as opposed to the asynchronous PDH structure.
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