Chapter 9: Ethernet Cards
Standard Ethernet Features
SmartBits System Reference 121
Filters
Pre-capture filtering is available on one or more of the following criteria: CRC, alignment,
oversize, undersize, data integrity errors, Rx triggers, or All.
Flow Control
Supports flow control (PAUSE frames) according to the IEEE 802.3x standard. On the
receiver side, each port detects PAUSE frames as they are received and optionally initiates
the proper throttling of the transmitter. Additionally, each port supports a counter that
indicates the number of PAUSE frames received.
Frame Rates, Maximum
How to calculate the maximum frame rate:
• Constants:
Gap = 96 bits
Preamble = 64 bits
FrameSize=8
× N bits (N = number of bytes)
Speed = 10,000,000 (Ethernet), 100,000,000 (Fast Ethernet), 1,000,000,000 (Gigabit
Ethernet) in bits per second (bps)
• Formula:
Maximum Frame Rate = Speed
÷ (Gap + Preamble + Frame Size)
Size Ethernet (pps) Fast Ethernet (pps) GigabitEthernet(pps)
64 14,880 148,809 1,488,095
128 8,445 84,459 844,594
256 4,528 45,289 452,898
512 2,349 23,496 234,962
1024 1,197 11,973 119,731
1280 961 9,615 96,153
1518 812 8,127 81,274
To Next Page
Loading...