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| Electronic Industries Association/Telecommunications Industry Association 232 |
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| Common physical layer interface standard that supports unbalanced circuits at signal speeds of up to 64 kbps |
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| Closely resembles the V.24 specification |
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| protocol that allows signal speeds of up to 64 kb/s on a 25-pin D-connector over short distances |
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| ITU-T standard for a physical layer interface between DTE and DCE |
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| protocol that allows signal speeds of up to 2 Mbps on a 36-pin D-connector over longer cable runs |
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| also known as RS422 and RS-423 |
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| protocol that provides access to services up to 52 Mb/s on a 60-pin D-connector |
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| standard describes the High-Speed Serial Interface (HSSI) |
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| network standard for high-speed serial connections over WAN links up to 52 Mbps |
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| ITU-T standard describing a synchronous, physical layer protocol used for communications between a network access device and a packet network |
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| most common in Europe and the US with speeds up to 48 Kbps |
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| originally supported data rates of 48 kb/s, now supports up to 2.048 Mb/s using 34-pin rectangular connector |
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| ITU-T protocol standard for synchronous digital communications |
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| uses a 15-pin D-connector |
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| Data Circuit-Terminating Equipment |
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| User device with interface connecting to the WAN link |
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| End of the WAN provider side of the communication facility |
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