User guide

148 RealCT Direct API Developer Guide
Chapter 5: MVIP-90
Understanding Framing
Data in DSix or DSox streams are formatted into frames. Each
frame contains 8 bits of information for each of the 32 timeslots,
as shown in Figure 26. Each 8 bit timeslot has a period of 125
µs, for a total of 8000 timeslots per second (8 bits/timeslot x 8000
timeslots/second = 64 Kb/s).
.
Figure 26. Timeslots in an MVIP Frame
The MVIP-90 clock carries timing information to synchronize
the frames. The clocking information travels on a dedicated pair
of wires rather than taking up space in the stream. Since
streams are devoted to transmitting data rather than signaling
information, they are called clear channels. For more
information on setting the MVIP clocks, see Configuring the
MVIP-90 Clock on page 150.
TS0 TS1 TS2 TS3 TS4
TS28
TS31
TS30
TS29
Frame 1 Frame 3 Frame 4Frame 2
8 bits per timeslot