Comtech EF Data C5 - Manual (Page 206)

Operation C5/K1/K3 Integrated Satellite Terminal System
4–80 Rev. 0
4.5.1.3 Frame/Multiframe Length
The depth of the receive buffer required has been discussed in Section 4.5.1, and is
applicable to all unframed data.
When the data is framed (such as 2048 kbit/s G.732 or 1544 kbit/s G.733), it is desirable
to provide slips in predefined locations. The advantage of organized slip locations (in
relation to the frame) is that multiplexing equipment does not lose sync and outages on
any channel are kept to a minimum.
A 2048 kbit/s frame structure commonly used is G.732. This has a frame length of
256 bits with 16 frames per multiframe (4096 bits total, or 2 ms).
4.5.1.4 Total Buffer Length
The size of the buffer will be determined as described in Sections 3.4.1.1 through 3.4.1.3.
Using the examples from the three previous sections, the total buffer depth (end to end)
will be:
Doppler + Plesiochronous (rounded up to the nearest multiframe)
1.15 ms + 6.98 ms = 8.13 ms
If the frame length is 2 ms, then the nearest multiframe will be 10 ms, or 20,480 bits.
4.5.2 Converting Between Bits and Seconds
4.5.2.1 Bits to Seconds
1/Data Rate x Bits = Seconds.
4.5.2.2 Seconds to Bits
Data Rate x Seconds = Bits.