Spirent SmartBits System, Reference Manual

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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 0.1
µ
Sec 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.