Performance of Random Error Correcting Codes on the Switched Telephone Network

The performance of perfect codes on the switched telephone network is evaluated in terms of output block error and output bit error probability. By evaluating these codes against experimental data describing the switched telephone network, it is shown that significant improvement in the block error rate is possible, but that only negligible improvement in the bit error rate is obtained even with block lengths as long as 230 bits and with redundancies approaching unity.