Right, but what's your question? Just like I said, each T1 frame of
192 data bits (of which there are 8000 each second), carries eight bits from each of the 24 (23B+1D) 64kbps channels in a PRI (assuming the T1 is carrying a PRI, of course). And each frame has a 193rd bit for framing, which is the source of the 8000bps you were missing.
The 193x8000 frame format is inherent in a T1. You can channelize that many different ways, but with voice-like circuits, the sub channels are invariably bit sliced across the frame in such a way that no jitter, burstyness, or lag is introduced. Remember that basic voice service is 8000 eight bit samples per second, and that you'll find line/frame formats all over the (telco) network synchronized in some fashion to the 8000 samples-per-second rate for the precise reason that you can carry that data rate without jitter, burstyness, or lag.