Ethernet GPSS World , :
, (STARTTIME) (END_TIME) , (BLOCKS), (FACILITIES), (STORAGES);
, (NAME) (VALUE);
, (LOC), (BLOCKTYPE), , (ENTRY_COUNT), (CURRENTCOUNT);
, (FACILITY), (ENTRIES), (UTIL), (AVETIME);
, (QUEUE), (), (CONT), , (ENTRIES) (ENTRIES(O)), (AVECONT.), (AVE_TIME) (AVE(-O));
, (TABLE), (MEAN) (STD.DEV.) , (RANGE), (FREQUENCY) (CUM.%) ;
, (SAVEVALUE) (VALUE).
PREEMPT COLLISION.
Ethernet N TABLATE. X N, Y - N.
QTABLE. X (t), Y - , , , .
1. , .1 CSMA/CD Ethernet GPSS .2.
2. GPSS. .
3. (Command/Create Simulation), (Command/Start).
4. .
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5. : , , .
5.1. , - Node_Period t :
(Node_Period): 420,8; 210,4; 157,6; 105,2; 78,9; 52,6; 36,1. t QTABLE.
5.2. Node_Period .
5.3. Node_Period , t, () , .
- | Node_ Period | t | (ρ) | N | - . Nmax | |
420,8 | ||||||
210,4 | ||||||
157,6 | ||||||
105,2 | ||||||
78,9 | ||||||
52,6 | ||||||
36,1 |
5.4. , 40 %.
5.5. , , , t.
6. L . (Node_Period) = 105,2 Nmax L, L = 50, 100, 250, 500, 1000, 2500 .
7. . (Node_Period = 52,6 36,1) :
τ = RAND(0, 2min(10, N)) 512 ,
τ = RAND(0, 2 N) 512 ,
τ = RAND(0, 210) 512 ,
τ = RAND(0, 26) 512 ,
τ = RAND(0, 210) 96 .
8. Ethernet FastEthernet
8.1. , FastEthernet.
8.2. Node_Period = 36,1. Ethernet.
8.3. , FastEthernet , , t.
1. . 5 .
2. . 5 6 .
3. ρ = 0,4.
4. , , , t Ethernet FastEthernet.
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5. .
6. FastEthernet.
7. FastEthernet.
1. .
2. IPG. ?
3. jam-.
4. Ethernet.
5. ()?
6. ?
7. CSMA/CD?
8. ? ?
9. , 100 % .
10. Collide GPSS ?
11. CSMA/CD.
12. 512 ?
13. (Truncated binary exponential back off ), τ = RAND(0, 210) 512 ?
14. ?
15. GPSS.
16. .
17. Node_Period = 105,2 52,6?