Chapter 13: Token Ring Cards
TR-8405 Token Ring 4/16Mbps SmartCard
SmartBits System Reference 175
TR-8405 Token Ring 4/16Mbps SmartCard
Card Type: Token Ring.
Where Used: SMB-200 and SMB-2000: one port per card; each card occupies one slot in a chassis.
Applications
Supported:
SmartWindow, SmartLib, and SmartApplications and AST for Token Ring.
Devices Tested: Token Ring devices and networks.
Test Objective: • Generate and monitor both 16 Mbps and 4 Mbps Token Ring traffic.
• Capable of sourcing frames and measuring ring activity at very high rates, to measure
Token Ring equipment accurately.
Per Port
Specifications:
• Sends up to 40,000 frames/sec (by sending multiple frames per token).
• Supports half-duplex and full-duplex Token Ring operation.
• User-selectable mode: between a station (connect through an MAU to a ring) and a
port (connect directly to another station).
• Supports both TKP ("Token Passing") and TXI ("Transmit Immediate") operation.
The card performance is effectively doubled when the card is running in TXI mode.
• Determines frame transit times to an accuracy of 0.1µSec that is fast enough to
measure the latency of individual ring components.
• Provides Early Token Release: User-specified option to release the token before
stripping the transmitted frame.
• Offers Transmission Error Insertion: FCS Error, Abort, Burst 5, Code Violation,
Error Bit Set, and Address Recognized Bit Set.
• Interpacket Gap. The Interpacket Gap at 16 Mbps can be set from 0 nanoseconds to
1.6 seconds in 62.5 nanosecond increments. The Random Gap function randomly
varies the gap from 0 nanoseconds to the user-specified maximum from 6.5 ms to
1600 ms. At 4 Mbps, gap resolution is 256 ns.
• Packet Length. From 1 to 18006 bytes fixed, or random varying from 18 to 18191
bytes (4096 bytes for 4 Mbps). The random packet length function allows the user to
control the range. The upper limit of the range is twice the length entered in the Fixed
Length field.
To Next Page
Loading...