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It is well known that the performance of a data receiver for an intersymbol interference (ISI) channel can depend strongly on the detection delay 6. For a discrete-time communication system, this paper derives a lower bound on the bit-error probability as a function of 6. This "restricted delay bound" is governed by a "restricted-delay distance" d(6). In many instances, it improves upon Forney's bound, which is governed by the minimum distance &in. For instance, for partial-response channels,doi:10.1109/26.293683 fatcat:jvnmy7akr5b6zhnsxdrcgj3boe