Introduction to Tandem X.25 Capabilities

Appendix B X25AM Parameters
065307 Tandem Computers Incorporated B–1
This appendix provides a summary of X25AM parameters. Tables B-1 through B-4 list
the X.25 standard characteristics and provide a summary of the Tandem X25AM
implementation of these characteristics. The tables include the X25AM range of
values, default values, SCF attributes, and SYSGEN modifiers for specifying these
characteristics.
For a complete list of SCF attributes for X25AM, refer to the SCF Reference Manual for
X25AM. For a complete list of SYSGEN modifiers for X25AM, refer to the System
Generation Manual for X25AM.
Table B-1 summarizes the X25AM parameters for link-level characteristics.
Table B-1. X25AM Link-Level Characteristics
Network
Subscription
Parameter
Possible
Values
Default
Values
SCF
Attribute
SYSGEN
Modifier Comments
Framing HDLC HDLC — — —
Link Protocol LAPB
LAP *
LAPB — — In software releases prior to
C30.08, the SYSGEN modifier
L2PROTOCOL was used to
specify the appropriate protocol
module. As of C30.08, this value
is generated automatically by
X25AM.
LAP is supported as an
alternative link protocol on
software releases prior to
C30.08.
Logical
Addressing
DTE
DCE
DTE FRAMEMODE DTE
DCE
T1 0 – 32767
(.01 seconds)
300
(3 secs)
T1TIMEOUT L2TIMEOUT Retransmission timer.
T3 0 – 32767
(.01 seconds)
1500
(15 secs)
IDLETIMEOUT L2IDLETIMEOUT Idle Line Timer.
N1 See formula. ((Packetsize + Hdr) x 8) +
FCS + (Ctrl +Addr fields)
N2 0 – 255 10 RETRIES L2RETRIES Maximum number of
retransmissions.
K 1 – 7 4 — L2WINDOW Maximum number of outstanding
Information frames.