Filter
Top Products
Table 13-1. X.25 PDN Parameter Bitmap Argument Values
Bit Number
Function
ON (logical 1)
OFF (logical 0)
10
COLLISION
REJECT
If a Clear Collision occurs, and the
received CLEAR packet has a bad
length, a new CLEAR packet is
sent with a diagnostic code.
If a Clear Collision occurs, and the
received CLEAR packet has a bad
length, a new CLEAR packet is
dropped.
9
D BIT
CONFIRMATION
Disables the D bit in CALL
CONFIRM packets.
Enables the D bit in CALL CONFIRM
packets.
8
CALL DATA X.25 will accept a CALL ACCEPT
packet containing a User Data
field, even if Fast Select was not
specified in the call request.
X.25 will not accept a CALL
ACCEPT packet containing a User
Data field, unless Fast Select was
specified in the call request.
7
ACTIVE
CONNECTION
X.25 begins sending SABMs as
soon as the physical connection is
established.
X.25 waits for an SABM from the
remote end to initiate establishment
of Frame Level.
6
N2 ACTION If X.25 is waiting for a UA, and
receives either a T1 timeout or a
DM, it retries the SABM up to N2
times. If after N2 retries, it has still
not received a UA, it goes to
disconnect mode and ceases to
transmit SABMs.
If X.25 is waiting for a UA, and
receives either a T1 timeout or a
DM, it retries the SABM up to N2
times. If after N2 retries, it has still
not received a UA, it goes to
disconnect mode and continues
sending SABMs at intervals of T3
(20) seconds.
5
INFO COUNT If the X.25 (1) enters the T1 time-
out state, (2) sends an RR, (3)
obtains an RR response, and (4)
then retransmits the
unacknowledged INFO frame—the
retry counter is not cleared until
the retransmitted INFO frame is
acknowledged. This procedure
avoids an endless loop that would
occur if the DCE were processing
RR frames, but not INFO frames.
If the X.25 (1) enters the T1 timeout
state, (2) sends an RR, (3) obtains an
RR response, and (4) retransmits the
unacknowledged INFO frame — the
retry counter clears immediately per
the CCCIT definition. This
procedure leaves open the
possibility of an endless loop if the
DCE were processing RR frames,
but not INFO frames.
4
DISC ACTION If X.25 sends an SABM (or is
waiting for one), and receives a
DISC, it sends an SABM
immediately after responding to
the previous flag.
If X.25 sends an SABM (or is waiting
for one), and receives a DISC, it dis-
connects the link after responding to
the previous flag.
(Continued)
X.25 Service Parameters
Parameters and Options
13-14