Hp MPX200 Multifunction Router Manual do Utilizador descarregar pdf (Página 124)

Then, convert the MWS to a recommended scale factor by dividing it by the default window size

(32,768 bytes). Use Table 21 (page 124) to determine the scale factor.

Table 21 TCP window size scale factors

Scale factor / TCP Window sizeMWS scale result

0 / 32KB0 to 2

1 / 64KB2 to 4

2 / 128KB4 to 8

3 / 256KB8 to 16

4 / 512KB16 to 32

5 / 1MB32 to 64

6 / 2MB64 to 128

7 / 4MB128 to 256

8 / 8MB256 to 512

9 / 16MB512 or greater

TCP window size and scaling factor recommendations

Table 22 (page 124) through Table 28 (page 126) provide TCP window size and scaling factor

settings for specific WAN environments. These tables are organized by typical link speed.

NOTE: The TCP window size recommendations listed in Table 22 (page 124) through

Table 28 (page 126) are based on low-loss networks (0.0012% average packet-loss ratio over 24

hours). For higher-loss, longer-latency networks, you should reduce the recommended window size

and scaling factor by one setting to compensate for the increased number of packet retransmissions.

Table 22 T1/DS-1 1.554 Mb/sec (bandwidth = 1 Mb)

Scaling factor (2

)Window size (bytes)Round trip time (RTT) in ms

164K250

032K100

032K50

032K25

032K20

032K15

032K10

032K5

032K2.5

032K1 or less

Table 23 T3/DS-3 45 Mb/sec (bandwidth = 43 Mb)

Scaling factor (2

)Window size (bytes)Round trip time (RTT) in ms

51M250

4512K100

3256K50

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