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Q922 November
Identical to Q922 encoding except in the extended forms (three-byte and four-byte
address fields). Q922 November encoding lacks a control indicator (D/C) bit in the
least significant byte.
Yes
Disables the circuit when a connect failure occurs.
No
Allows the circuit to continue operating when a connect failure occurs.
Echo Request Time (sec)
Sets the interval, in seconds, between the transmission of Point-to-Point echo
request packets. The default time (zero seconds) disables echo requests. When PPP
Echo Request Times is enabled (set to a not zero value), the router sends a Point-to-
Point echo request with every packet and expects to receive a reply from the
destination to confirm arrival of the packet. The link between the router and
destination is considered down if the destination fails to echo a reply after five echo
request times elapse. The router automatically attempts to restart the link control
protocol if the link goes down and the LCP restart option is enabled.
Default: 0
Range:
Events for Error
Works in conjunction with Monitored Events parameter to define a quality of service
metric for the Frame Relay DCE/DTE connection.
Default: 3
Range: 1 to 10
The Events for Error and Monitored Events parameters work together to form a j
out of k relationship for measuring circuit reliability. If the number of faulty status
exchanges (Status Inquiry, Link Integrity Verification, Full Status Inquiry, and/or Full
Status Report messages) in a continuous sequence of k events(Monitored Events),
equals or exceeds j (Events for Error), the interface is declared down. While the
connection is down, status exchanges continue. Once j consecutive status
exchanges are transferred without error, the connection is restored to the active
state.
Extended (32-bit) CRC
Determines the error detection scheme for encapsulated packets. Point-to-Point or
SMDS circuits can use either a 16-bit (standard) or 32-bit (extended) encapsulation
scheme and a corresponding cyclic redundancy check (CRC) to detect errors in the
encapsulated packet.
Point-to-Point Default: No
SMDS Default: Yes
Yes
Enables extended 32-bit encapsulation and CRC.
No
Enables standard 16-bit encapsulation and CRC.
Circuit Parameters
Parameters and Options
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