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SDL framing is in general accomplished by the use of a four octet header on the packet.
With the SDL Datagram Offset set to 4, the value placed in the Packet Length field is exactly the length in octets of the PPP frame itself, including the address and control fields but not including the CRC field (the RFC 1662 PPP FCS field is not used with SDL).
SDL Scrambler Synchronization As described in the previous section, the special value of 1 for Packet Length is reserved to transfer the scrambler state from the transmitter to the receiver.
SDL processes have separate memory spaces (i.e., data is local to a process or procedure).
SDL defines clear interfaces between blocks and processes by means of a combined channel and signal route architecture.
SDL time is abstract in the sense that it can be efficiently mapped to the time of the target system, be it an operating system timer or hardware timer.
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