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DLCI Encoding Length
Sets the length of the Frame Relay address field.
Default: Two Bytes
Four Bytes
Sets the DCLI encoding length for four-byte extended address fields. Use this value
only if your Frame Relay service supports extended four-byte address fields.
Three Bytes
Sets three-byte extended address fields. Use this value only if your Frame Relay
services supports extended three-byte address fields.
Three + Control
Sets Q922 encoding (not yet completely standardized). While this value can be
selected with the Q922 encoding type, the control field is undefined.
Two Bytes
Sets the length of the address field to two bytes.
Two + Control
Sets Two + Control Q922 encoding (not yet completely standardized). While this
value can be selected with the Q922 encoding type, the control field is undefined.
DLCI Encoding Type
Selects the DLCI encoding format.
Default: Q.922
Q921
Q.921 is a virtually obsolete method of setting a 13-bit DLCI within a two-byte
address field. It drops the FECN, BECN, and DE bits from the second byte of the
address field. Select DLCI encoding on the basis of the encoding format used by the
attached Frame Relay DCE device.
Q922
Selects DLCI encoding as described in CCITT draft standard Q.922. This standard
specifies a 10-bit DLCI. While the DLCI is most often contained within a two-byte
address field, the Q.922 standard allows for three-byte and four-byte address fields.
Regardless of the address field length, Q.9222 encoding provides for forward explicit
congestion notification (FECN), backward explicit congestion notification (BECN),
discard eligibility (DE), and address field extension (EA) within the second byte of
the address field.
Q922 March
Defines a 11-bit DLC and drops the DE bit from the second byte of the address field.
Circuit
Parameters
4
Circuit Parameters
Parameters and Options
4-13