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How are frames, channel time slots, and bits numbered in T1 and E1?

April 26, 2017Bits channel e1 frames numbered slots T1 time

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How are frames, channel time slots, and bits numbered in T1 and E1?

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A5. According to the ITU-T specification G.704, the numbering structures for T1 and E1 digital transmission systems are as follows: In T1 systems, the frames are numbered 1 to 12 in the SF/D4 format, and 1 to 24 in the ESF. The channel time slots are numbered 1 to 24. The bits are numbered 1 to 8, with the 8th bit being the least significant bit (LSB). In E1 systems, the frames are numbered 0 to 15 in the CRC-4 and CAS multiframe formats. The channel time slots are numbered 0 to 31. The bits are numbered 1 to 8, with the 8th bit being the least significant bit (LSB).