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Was (wer) ist DS1C - definition
TELEPHONE TRANSMISSION CARRIER SYSTEM IN USA AND CANADA
T1 line; Digital signal 1; T1/E1; T1/PRI; T-span; Yellow alarm; Blue alarm; T1(Networking); DS1C; T1 circuit
DS1C
<communications> A DS level and framing specification for
digital signals in the North American digital transmission
hierarchy. A DS1C signal uses 48 PCM channels and has a
transmission rate of 3.15 Megabits per second, twice that of
DS1.
DS1C uses two DS1 signals combined and sent on a 3.152
megabit per second carrier which allows 64 kilobits per
second for synchronisation and framing using "{pulse
stuffing}". The channel 2 signal is logically inverted, and a
framing bit is stuffed in two out of three code words,
resulting in 26-bit information units. The channels are
interleaved and then scrambled by the addition modulo 2 of
the signal with the previous bit. Finally the bit stream is
combined with a control bit sequence that permits the
demultiplexor to function by preceding each 52 bits with one
DS1C framing bit. A series of 24 such 53-bit frames forms a
1272-bit "M-frame".
(1995-02-07)
T1 line
Digital Signal 1
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. DS1 is the primary digital telephone standard used in the United States, Canada and Japan and is able to transmit up to 24 multiplexed voice and data calls over telephone lines.
Wikipedia
Digital Signal 1
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. DS1 is the primary digital telephone standard used in the United States, Canada and Japan and is able to transmit up to 24 multiplexed voice and data calls over telephone lines. E-carrier is used in place of T-carrier outside the United States, Canada, Japan, and South Korea. DS1 is the logical bit pattern used over a physical T1 line; in practice, the terms DS1 and T1 are often used interchangeably.
