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Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. [1] 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.
Digital Signal Designation Bandwidth/data rate Channels (DS0s) Carrier designation DS0 64 kbit/s 1 DS1: 1.544 Mbit/s 24 T1 DS1 3.152 Mbit/s 48 T1c
A SONET 3/1 DCS will transmux and carry DS3 signals as STS-1 signals and groom TDM DS1/T1s using VT1.5 signals. The Central Office is where signals are generally switched and groomed to route DS1s needing to be mapped to other Optical or Electrical signals to get to different equipment or sent along to other Central Offices.
Intuitively, 5 out of 6 frames have 8-bit resolution equal to 64 kbit/s (8 bits × 8,000 samples per second = 64 kbit/s) and 1 out of every 6 frames has a 7-bit resolution (7 bits × 8,000 samples per second = 56 kbit/s). The distortion effect on voice and data signals is negligible when a modem is used for modulation.
Uniden was established on February 7, 1966, by its founder Hidero Fujimoto as "Uni Electronics Corp". Uniden became a well-known brand in the 1970s by manufacturing and marketing millions of citizens band radios (CB), under the Uniden brand as well as other companies such as Midland and Realistic, which rebranded the equipment under their own labels.
The STM-1 frame is transmitted in exactly 125 μs, therefore, there are 8,000 frames per second on a 155.52 Mbit/s OC-3 fiber-optic circuit. [nb 1] The STM-1 frame consists of overhead and pointers plus information payload. The first nine columns of each frame make up the section overhead and administrative unit pointers, and the last 261 ...