3Com 3C780 User Guide - Page 98

Displaying SMT Parameters

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Setting Up the Hub 4-11 Displaying SMT Parameters These three SMT parameters, which you can display but cannot change, provide additional information about ring timer functions: s Maximum Token Rotation Time (T-Max) s Negotiated Time (T-Neg) s Valid Transmission Timer (TVX) Maximum Token Rotation Time (T-Max) The Maximum Token Rotation Time (T-Max) is the maximum length of time allowed for the token to move around the ring. The factory-set default is 167.77 milliseconds. To view the value of the T-Max parameter, enter the show tmax command. A display similar to the following appears: T-Max = 167772 microseconds Negotiated Time (T-Neg) The Negotiated Time (T-Neg) is the ring's operational Target Token Rotation Time that results from the stations' bidding process in which the station requesting the fastest token rotation time wins the right to initialize the ring. To view the current value of T-Neg, enter the show tneg command. A display similar to the following appears: T-Neg = 83886 microseconds Valid Transmission Timer (TVX) The Media Access Control (MAC) protocol is responsible for all frame-based functions and controls a station's access to the ring. Each MAC is required to maintain a Valid Transmission Timer (TVX). The expiration threshold of the TVX indicates the maximum time allowed between the receipt of valid frames or tokens. The factory-set default is 2621.40 microseconds. You cannot adjust the value of TVX, but you can display its value. To display the current value of TVX, enter the show tvx command. A display similar to the following appears: TVX Value in use = 2.62 milliseconds

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4-11
Setting Up the Hub
Displaying SMT Parameters
These three SMT parameters, which you can display but cannot change, provide
additional information about ring timer functions:
■
Maximum Token Rotation Time (T-Max)
■
Negotiated Time (T-Neg)
■
Valid Transmission Timer (TVX)
Maximum Token Rotation Time (T-Max)
The Maximum Token Rotation Time (T-Max) is the maximum length of time
allowed for the token to move around the ring.
The factory-set default is 167.77
milliseconds.
To view the value of the T-Max parameter, enter the
show tmax
command.
A display similar to the following appears:
T-Max = 167772 microseconds
Negotiated Time (T-Neg)
The Negotiated Time (T-Neg) is the ring’s operational Target Token Rotation
Time that results from the stations’ bidding process in which the station
requesting the fastest token rotation time wins the right to initialize the ring.
To
view the current value of T-Neg, enter the
show tneg
command.
A display
similar to the following appears:
T-Neg = 83886 microseconds
Valid Transmission Timer (TVX)
The Media Access Control (MAC) protocol is responsible for all frame-based
functions and controls a station’s access to the ring.
Each MAC is required to
maintain a Valid Transmission Timer (TVX).
The expiration threshold of the
TVX indicates the maximum time allowed between the receipt of valid frames
or tokens.
The factory-set default is 2621.40 microseconds.
You cannot adjust the value of
TVX, but you can display its value.
To display the current value of TVX, enter
the
show tvx
command.
A display similar to the following appears:
TVX Value in use = 2.62 milliseconds