Precautions in Using Socket Services | Section |
6-9-5 Maximum Transmission Delays (Ignoring other Network Delays)
The transmission delays for socket service is calculated as the sum of the communications processing times for both nodes.
Transmission delay = Remote node send processing time + Local node receive processing time + Local node send processing time + Remote node receive processing time
Calculate the maximum Ethernet Unit transmission delays for sending and receiving using the following formulas. These times are the same for both UDP and TCP.
■Requesting UDP Socket Services by Manipulating Dedicated Control Bits
CS/CJ CPU Units
Transmission processing time = reception processing time = CPU Unit cycle time ⋅ 7 + number of send/receive bytes ⋅ 0.002 + 22 (ms)
CS-H/CJ-H CPU Units
Transmission processing time = reception processing time = CPU Unit cycle time ⋅ 7 + number of send/receive bytes ⋅ 0.001 + 17 (ms)
■Requesting TCP Socket Services by Manipulating Dedicated Control Bits
CS/CJ CPU Units
Transmission processing time = reception processing time = CPU Unit cycle time ⋅ 7 + number of send/receive bytes ⋅ 0.002 + 29 (ms)
Transmission processing time = reception processing time = CPU Unit cycle time ⋅ 7 + number of send/receive bytes ⋅ 0.001 + 21 (ms)
■Requesting UDP Socket Services by Executing CMND(490)
CS/CJ CPU Units
transmission processing time = reception processing time = CPU Unit cycle time ⋅ 3 + number of send/receive bytes ⋅ 0.002 + A (ms) (See note 1.)
Note 1: When the CPU Unit cycle time is less than 2 ms, A=45, and when it is 2 ms or more, A = 67
transmission processing time = reception processing time = CPU Unit cycle time ⋅ 2 + number of send/receive bytes ⋅ 0.001 + A (ms) (See note 2.)
Note 2: When the CPU Unit cycle time is less than 2 ms, A = 26, and when it is 2 ms or more, A = 52
■TCP Socket Services Using CMND(490)
CS/CJ CPU Units
Transmission processing time = Reception processing time = CPU Unit cycle time ⋅ 3 + number of bytes sent/received ⋅ 0.002 + A (ms) (See note 3.)
Note 3: When the CPU Unit cycle time is less than 2 ms, A = 46, and when it is 2 ms or more, A = 68
transmission processing time = reception processing time = CPU Unit cycle time ⋅ 2 + number of bytes sent/received ⋅ 0.001+ A (ms) (See note 4.)
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