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Definition of "D4 Frame" |
A D4 frame consists of 192 data bits: 24 8-bit channels and a single framing bit. The single framing bit is part of a 12-bit framing sequence. The 193rd bit in each T1 frame is set to a value, and every 12 consecutive frames are examined to determine the framing bit pattern for the 12-bit superframe. / The two-layer semiconductor diode has led to three-, four, and even five-layer devices. A family of four-layer pnpn devices will first be considered: the SCR silicon-controlled rectifier, the SCS silicon-controlled switch, the GTO gate turn-off switch, the LASCR light-activated SCR, and then an increasingly important device the UJT unijunction transistor. Those four-layer devices with a control mechanism are commonly referred to as thyristors, although the term is most frequently applied to the SCR. |
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