In this article we will discuss E-carrier, will make brief discussion on E-carrier, last article we discuss about Cisco Discovery Protocol.

E1 is a European digital transmission format devised by the ITU-TS and given the name by the Conference of European Postal and Telecommunication Administration (CEPT). It’s the equivalent of the North American T-carriersystem format. E2 through E5 are carriers in increasing multiples of the E1 format.

The E-carrier is a member of the series of carrier systems developed for digital transmission of many simultaneous telephone calls by time-division multiplexing. E1 consists of 32 channels, which can be used to carry simultaneous voice calls, and each channel is called as a Time Slot (TS). As per the ITU-T recommendations, 2 time slots are reserved for signalling and synchronization. Therefore, E1 can carry 30 voice calls or data communications simultaneously.

Similar to the North American T-1, E1 is the European format for digital transmission.E1 carries signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps).

An E1 link operates over two separate sets of wires, usually unshielded twisted pair (balanced cable) or using coaxial (unbalanced cable). A nominal 3 volt peak signal is encoded with pulses using a method avoiding long periods without polarity changes. The line data rate is 2.048 Mbit/s

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