ifc98 - Electrical and Computer EngineeringABR CBR/VBR includes ABR excludes ABR 0 10 20 30 40 50 60...

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Transcript of ifc98 - Electrical and Computer EngineeringABR CBR/VBR includes ABR excludes ABR 0 10 20 30 40 50 60...

ATM

switch

ATM

switch

ATM

switchB-TE

B-TE

B-TE

B-TE

B-TE

B-TE

B-TE

B-TE

ATM

switch

ABR queue

CBR/VBR queueArriving cells

Separate queues at output port of ATM switch

To link

B-TE 1

ATMswitch

1

ATMswitch

1

B-TE 8

B-TE 7

B-TE 6

B-TE 5

B-TE 4

B-TE 3

B-TE 2

ATMswitch

4

ATMswitch

4

ATMswitch

3

ATMswitch

3

ATMswitch

2

ATMswitch

2

L11

L21

LS12

LS23

L43

L53L63

LS34

L74

L84

L32

VP Source Destination Path

1 B-TE1 B-TE7

B-TE2 B-TE3

B-TE4 B-TE8

B-TE5 B-TE8

B-TE6 B-TE7

2

3

4

5

ON OFF

PCR PCRPCR

ABRCBR/VBR

includes ABRexcludes ABR

0 10 20 30 40 50 60 70 80 90 1000

50

100

150

200

250

300Total Peak & Mean Bit Rate for CBR/VBR vs Time

Bit

Rat

e (M

bps)

0 10 20 30 40 50 60 70 80 90 1000

20

40

60

80

100

% U

tilis

atio

n

SW3 Output Link Utilisation vs Time

Mean Bit Rate

Peak Bit Rate

0 10 20 30 40 50 60 70 80 90 10010

−4

10−3

10−2

10−1

100

CLR vs Time

CLR

includes ABRexcludes ABR

0 10 20 30 40 50 60 70 80 90 1000

50

100

150

200

250

300Total Peak & Mean Bit Rate for CBR/VBR vs Time

Bit

Rat

e (M

bps)

ABRCBR/VBR

0 10 20 30 40 50 60 70 80 90 10010

−4

10−3

10−2

10−1

100

CLR vs Time

CLR

0 10 20 30 40 50 60 70 80 90 1000

20

40

60

80

100

% U

tilis

atio

n

SW3 Output Link Utilisation vs Time

Mean Bit Rate

Peak Bit Rate

ABRCBR/VBR

includes ABRexcludes ABR

0 10 20 30 40 50 60 70 80 90 1000

50

100

150

200

250

300Total Peak & Mean Bit Rate for CBR/VBR vs Time

Bit

Rat

e (M

bps)

0 10 20 30 40 50 60 70 80 90 10010

−4

10−3

10−2

10−1

100

CLR vs Time

CLR

0 10 20 30 40 50 60 70 80 90 1000

20

40

60

80

100

% U

tilis

atio

n

SW3 Output Link Utilisation vs Time

Mean Bit Rate

Peak Bit Rate

ABR

CBR/VBR

includes ABR

excludes ABR

0 10 20 30 40 50 60 70 80 90 10010

−4

10−3

10−2

10−1

100

CLR vs Time

CLR

0 10 20 30 40 50 60 70 80 90 1000

50

100

150

200

250

300Total Declared Peak & Mean Bit Rates for CBR/VBR vs Time

Bit

Rat

e (M

bps)

0 10 20 30 40 50 60 70 80 90 1000

20

40

60

80

100

% U

tilis

atio

n

SW3 Output Link Utilisation vs Time

Mean Bit Rate

Peak Bit Rate

ON

Cell transmitswith probability PCell transmitswith probability P

ON OFF

ABR

CBR/VBR

includes ABR

excludes ABR

0 10 20 30 40 50 60 70 80 90 10010

−4

10−3

10−2

10−1

100

CLR vs Time

CLR

0 10 20 30 40 50 60 70 80 90 1000

50

100

150

200

250

300Total Peak & Mean Bit Rate for CBR/VBR vs Time

Bit

Rat

e (M

bps)

0 10 20 30 40 50 60 70 80 90 1000

20

40

60

80

100

% U

tilis

atio

n

SW3 Output Link Utilisation vs Time

Mean Bit Rate

Peak Bit Rate

ABR

CBR/VBR

includes ABR

excludes ABR

0 10 20 30 40 50 60 70 80 90 1000

50

100

150

200

250

300Total Peak & Mean Bit Rate for CBR/VBR vs Time

Bit

Rat

e (M

bps)

0 10 20 30 40 50 60 70 80 90 1000

20

40

60

80

100

% U

tilis

atio

n

SW3 Output Link Utilisation vs Time

0 10 20 30 40 50 60 70 80 90 10010

−4

10−3

10−2

10−1

100

CLR vs Time

CLR