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Traditional telephony uses twisted pairs of copper wire, bundled into large cables of hundreds or thousands of cables, from endpoints such as office building to the end office of the carrier If these cables are relatively new, they will be suitable for emerging digital technologies such as ISDN and xDSL Unfortunately, many performance-improving features used in the analog world are incompatible with digital transmission Digital end offices begin with channel banks where the analog signals are digitized The output of the channel bank, directed to the traditional second mile, is a digital T1 or E1 stream We have discussed T1/E1 channels as digital streams These facilities were developed as digital carriers for voice Formally, DS1 is a signal format and T1 is a specific transmission system that carries DS1 signals over twisted copper pairs, but the terms are interchangeable in practice In modern terms, you can think of the basic voice-data interface device, the channel bank (Figure 74), as a set of analog interfaces and codecs under a central multiplexing control Each analog channel converts to a 64-Kbps DS0 signal Algorithms used by the codecs differ in various parts of the world Canada, the United States, and Japan use -law, Europe uses A-law, and there are a few other algorithms such as the K-law used in Mexico Mexico also uses E1 rather than T1 links For end-to-end voice to work between different codecs, a gateway function will be needed Basic telephony multiplexing is fixed rather than statistical It is worth noting that 64 Kbps is the basic rate at which a single voice call is digitized North American channel banks combine 24 DS0 signals into a DS1 signal The Consultative Committee for International Telephony and Telegraphy (CCITT)/ITU version, used in Europe, is the E1 signal upc internet 30+ UPC internet zkušenosti - poradna Živě.cz
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