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The E&M standards were initially developed by Bell Labs and extended by national PTT administrations. The standard defines two sides of the interface, the trunk circuit and the signaling unit. The trunk circuit is normally the side to which the PABX is connected.
2 lut 2006 · The most common form of analog trunking is the E&M interface. E&M Signaling is commonly referred to as 'ear & mouth' or 'recEive and transMit', but its origin comes from the term earth and magnet. Earth represents electrical ground and magnet represents the electromagnet used to generate tone.
2 lut 2006 · This document discusses the standard analog E & M interface types I, II, III, V (IV is not supported by Cisco platforms) and wiring arrangements. You can use this document as a troubleshooting reference for wiring problems between the router and private branch exchange (PBX)/Telco equipment.
An ear & mouth or rEceive & transMit (E&M) interface is a common trunk line that connects to a PBX through an RJ-48 connector. The E&M interface supports E&M signaling. The E signaling receives signals from the peer, and the M signaling sends signals to the peer.
Router A connects to the data processing center through an E&M interface, and Router B connects to the E&M data transceiver through an E&M interface. Router A and Router B have set up an MPLS tunnel between them.
PE1 on the backbone network uses an E&M interface to connect to the Voice Communication System of the ACC, and PE2 uses an E&M interface to connect to the broadcasting system.
An E&M interface supports E&M signaling and divides each voice connection into trunk circuit side and signaling unit side (similar to DCE and DTE). An E&M interface provides on-hook/off-hook signals with minimum interference.
