Page 110 - Optical Switching And Networking Handbook

05_200023_CH04/Batesx 1/17/01 8:18 AM Page 95

if we

Payload Bytes/Row* 86 258 260 1,032 1043 4,128 4,175 16,152 64,608 For example,

Payload Bytes 774 2,322 2,340 9,288 9,387 37,152 37,575 148,608 594,432

Rows/Frame 90 270 270 1,080 1,080 4,320 4,320 17,280 69,120

Frame Size 810 2,430 2,430 9,720 9,720 38,880 38,880 155,520 622,080 the concatenated payloads will produce more bytes because the payloads are all in one set of path overhead. eliminate the path overhead of two OC-1s when using an OC-3c, then the payload increases to 2,340 and the payload bytes per row increases by

Mbps 51.84 155.52 155.52 622.08 622.08 2,488.32 2,488.32 9,953.28 39.81312

Fiber OC-1 OC-3 OC-3c OC-12 OC-12c OC-48 OC-48c OC-192 OC-768

SONET STS-1 STS-3 STS-3c STS-12 STS-12c STS-48 STS-48c STS-192 STS-768

Table 4-5 Comparing SDH and SONET Frame Sizes and Nomenclature SDH STM-0 STM-1 STM-4 STM-16 STM-64 STM-256 *In some cases, two.

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