This happened to me last night, and it still rankles. Nothing much to do about it, but still - thought I'd get it off my chest. At
There's just no way to catch up with somebody like that, and explain that T1 lines and PCs are different worlds. Yes, the synchronous protocols used in telephony require amazingly accurate synchronization - and achieve it. Your average PC, on the other hand, can drift by 10ms in a matter of minutes. The requirement for PCs used by brokers is that they be within 3 seconds of the correct time. In fact, our product spec is to be within 250ms, because it's achievable and sufficient for pretty much any network.
I've had a few interviews go wrong like that. Not fun.