| 摘要 |
In a communications arrangement, a first pulse code modulation (PCM) modem communicates data in the form of PCM words with a second PCM modem through a public switched telephone network (PSTN). The transmitted data may be affected by type A and/or type B robbed bit signaling occasioned by the PSTN such that the least significant bits (LSBs) of certain PCM words are "robbed" and substituted with signaling bits. Any such type A and/or type B robbed bit signaling is detected using two different training sequences during training of the second PCM modem. The would-be PCM words affected by either robbed bit signaling are identified to the first PCM modem. The latter then avoids transmitting data using the LSBs of those PCM words. In addition, through the training, a decision feed-back equalizer in the second PCM modem is properly adjusted, taking into account any robbed bit signaling affecting the transmitted training data.
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