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PCM24 vs PCM30 | difference between PCM24 and PCM30

This page on PCM24 vs PCM30 describes difference between PCM24 and PCM30. PCM stands for Pulse Code Modulation. It involves sampling, quantisation and coding process which converts voice into 64 Kbps standard rate. It is basic transmission level in telephone systems.

It is basically multiplexing technique with which multiple voice and/or data signals are combined and transmitted over single high speed link. This is done using TDM (Time Division Multiplexing) which has either 24 or 30 time slots, each having information at 64 Kbps rate.

PCM24-Pulse Code Modulation 24 channel systems

PCM T1 frame

As mentioned it is 24 channel system used on USA and Japan. It is also referred as T1 link. PCM24 has aggregate rate of 1.544 Mbps.
Refer PCM24 channels carried by T1 Frame➤➤

PCM30-Pulse Code Modulation 30 channel systems

PCM E1 frame

As mentioned it is 30 channel system used on Europe and else where as defined by CCITT. It is also referred as E1 link. PCM30 has aggregate rate of 2.048 Mbps.
Refer PCM30 channels carried by E1 Frame➤➤

Following table mentions difference between PCM24 and PCM30 systems.

Specifications PCM24 PCM30
Sampling Frequency (KHz) 8 8
Duration of time slot (µS) 5.2 3.9
Bit Width (µS) 0.65 0.49
Bit Transfer Rate (Mbps) 1.544 2.048
Frame Period (µS) 125 125
No. of bits per word 8 8
No. of frames per multiframe 12 16
Multiframe period (ms) 1.5 2
Frame alignment signal in Odd frames Even Frames
Frame alignment word 101010 0011011
Multiframe alignment word 001110 0000

Also refer channel associated signalling and common channel signalling types used in PCM based exchanges, Difference between CAS and CCS➤➤

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