 |
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|
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|
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| – |
follows
OSI stack
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| – |
CDPD
basically specifies physical layer and data link
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layer
protocols only
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| – |
nominal
channel rate: 19.2 kbps, maximum throughput
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after
coding & framing, ignoring contention, is 11.8
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kbps
on downlink (to mobile), 13.3 kbps on uplink
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| – |
standard
specifies support for CLNP (ConnectionLess
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Network
Protocol) and IP (Internet Protocol) at layer 3
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| – |
higher
layers can be TCP or TP4
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| – |
CDPD
also specifies a wide variety of upper-layer
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protocols
(directory management, electronic messaging,
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etc.),
based on OSI and Internet services
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