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To address a node on the SMDS network, all you need do is put
the node's SMDS address in the destination field of the SMDS frame.
In this way, SMDS behaves in a fashion similar to Ethernet or
Token-Ring, which delivers frames according to MAC addresses. A key
difference between SMDS and these LAN technologies, however, is the
maximum frame size allowed. Ethernet allows just over 1500 bytes,
and Token-Ring just over 4000 bytes, but SMDS allows up to 9188
bytes. These SMDS frames are segmented into ATM-sized 53-byte cells
for transfer across the network. A large frame size gives SMDS the
ability to encapsulate complete LAN frames, such as Ethernet,
Token-Ring, and FDDI, for transportation over the SMDS
network. |
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