What Are the Relations Between the Delay Caused by DBA Rate Limitation and the Size of User Packets?

View the author · Created Apr 17, 2017 00:59:01

In general, if the size of user packets is fixed, the delay is the smaller when the DBA bandwidth is higher; if the DBA bandwidth is fixed, the delay is the longer when the size of user packets is larger. The following section uses an example to describe it:
•The highest DBA bandwidth is presumed to be 1024 kbit/s and the size of user packets 1024 bytes. Because the size of GPON frames is fixed to 125 us, the size of the GPON frames that can be transmitted through a T-CONT is 16 bytes (1024 kbit/s x 0.000125s/8 bit = 16 bytes). As described in the GPON protocol, each GEM frame is 5 bytes long, so the size of actually transmitted Ethernet packets is 11 bytes.
•The size of user packets is 1024 bytes, which will be transmitted for 94 times (1024/11=94) with a delay 11750 us (94 x 125 us = 11750 us). DBA jitter usually exists in actual networks, so the size of the packets that can be transmitted each time may be shorter than 11 bytes and the transmission of all packets can be completed only after 95 times; the delay is 11875 us (11750 us + 125 us = 11875 us).

View the author · Created Sep 24, 2018 07:04:33

you should keep the mtu as standerd

What Are the Relations Between the Delay Caused by DBA Rate Limitation and the Size of User Packets?

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What Are the Relations Between the Delay Caused by DBA Rate Limitation and the Size of User Packets?

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