Signalling equipment roads

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d-channel (often called " b + d"), but more commonly has b-channels and d-channels thus providing a backup signaling channel. the concept applies to e s as well and both can include more than pris. when configuring multiple t 's as isdn-pri's, it's possible to use nfas (non-facility associated signalling

pstn). the b-channels may be used flexibly and reassigned when necessary to meet special needs such as video conferences. pri channels and direct inward dialing are also common as a means of delivering inbound calls to voice over ip gateways from the pstn. see also[ edit ] non-facility associated signalling...

https://en.wikipedia.org/wiki/Primary_rate_interface

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protection station with nine rangers, who patrol over times every month with the longest round-trip distance up to kilometers. and in the winter, a critical period for forest fire prevention, they often have to patrol on foot as it is too dangerous to ride motorcycles on some parts of snow-covered mountain roads

protection station with nine rangers, who patrol over times every month with the longest round-trip distance up to kilometers. and in the winter, a critical period for forest fire prevention, they often have to patrol on foot as it is too dangerous to ride motorcycles on some parts of snow-covered mountain roads...

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residential retail sports & entertainment transport aviation major crossings, bridges & tunnels cut & cover tunnels hard rock tunneling immersed tunnels soft ground tunneling rail systems capacity analysis electrification intercity & high-speed railways metro & light rail rail safety rolling stock signalling

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