Source and Destination Address Format:
The addresses can be of two bytes (local address) or six bytes (global address).
local address format:
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I/G (1 BIT)
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NODE ADDRESS (15 BITS)
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alternatively
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I/G (1 BIT)
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RING ADDRESS (7 BITS)
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NODE ADDRESS (8 BITS)
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The 1st bit specifies individual or group address.
universal (global) address format:
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I/G (1 BIT)
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L/U (1 BIT)
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RING ADDRESS (14 BITS)
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NODE ADDRESS (32 BITS)
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The 1st bit shows individual or group address.
The 2nd bit specifies local or global (universal) address.
local group addresses (16 bits):
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I/G (1 BIT)
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T/B(1 BIT)
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GROUP ADDRESS (14 BITS)
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The 1st bit specifies an individual or group address.
The 2nd bit specifies traditional or bit signature group address.
Traditional Group Address: 2Exp14 groups can be defined.
Bit Signature Group Address: fourteen groups are defined. A host can be a part of none or any number of them. For multicasting, those set of bits are set to which the packet should go. For broadcasting, all fourteen bits are set. A host gets a packet only if it is a part of a group whose corresponding bit is set to one.
Universal group addresses (16 bits):
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I/G (1 BIT)
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RING NUMBER
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T/B (1 BIT)
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GROUP ADDRESS (14 BITS)
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The description is similar to as above.
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