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The following list summarizes the parameters that are provided
in the x25init configuration
files. There are parameters that are used by the X.25/9000 product
that are not shown here. These parameters are ignored by the ACC
Mux drivers when x25init is
executed; they have no effect whether defined or not. A detailed
explanation of each parameter can be found in the Installing
and Administering X.25/9000 manual. The default and
valid range of values are as documented in the HP X.25/9000 manuals
unless stated otherwise. - lci
Provides the circuit table definition for the subsystem, which
includes the starting value of the logical channel identifier (lci), the type of virtual circuits,
and the number of the specified type of virtual circuits. Parameter values are as documented in the X.25/9000 manuals.
There is no default. - def_inpacketsize
Specifies the default maximum
size, in octets, of a level 3 inbound packet. Valid values are 16,
32, 64, 128, 256, 512, 1024, 2048 or 4096 octets. Default value
is 128. - def_inthruput
Specifies the level 3 parameter for the rate of
data transmission, in bits per second, that is allowed inbound on
a switched virtual circuit. Valid values are 75, 150, 300, 600, 1200, 2400, 4800, 9600,
19200, 48000, 64000, 128,000, 192,000 or the corresponding CCITT
class numbers 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12, 13, 14 or 15 respectively.
Default value is 19200 (class 11). - def_inwindow
Specifies the default maximum
number of unacknowledged inbound packets between the DTE and the
DCE. Any value from 1 to 7 may be specified. Default value is 2. - def_outpacketsize
Specifies the default maximum
size, in octets, of a level 3 outbound packet. Valid values are
16, 32, 64, 128, 256, 512, 1024, 2048 or 4096 octets. Default value is
128. - def_outthruput
Specifies the level 3 parameter
for the rate of data transmission, in bits per second, that is allowed outbound
on a switched virtual circuit. Valid values are 75, 150, 300, 600, 1200, 2400, 4800, 9600,
19200, 48000, 64000, 128,000, 192,000 or the corresponding CCITT
class numbers 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12, 13, 14 or 15 respectively.
Default value is 19200 (class 11). - def_outwindow
Specifies the default maximum number of unacknowledged
outbound packets between the DTE and the DCE. Any value from 1 to 7 may be specified. Default value is 2. - device
Specifies the name of device
file that corresponds to the Mux port being configured. (Refer to Chapter 4 “ZCOM
Mux Subsystem Configuration”) The default value
is /dev/x25_0, which is an X.25/9000 format device file, and therefore
should not be used. For all interfaces, use the device file /dev/zx25mX
pY,
where the X refers
to the ACC Mux, and the Y refers to the mux port. - fastselectaccept
Level 3 parameter that specifies
if the use of the fast select facility is allowed. Default is disabled. - flow_control
Level 3 parameter that specifies
whether or not flow control negotiation will be used. If this is
on, the negotiated level 3 packet size and level 3 window size should
also be configured. Default is off. - holdtimer
IP-related parameter. Specifies
the hold timer in seconds. Default is 300. - idletimer
IP-related parameter. Specifies
the idle timer in seconds. Default is 600. - IPaddress
IP-related parameter. Specifies
the IP address for the port if IP is used. No default value. - l2_modulo
Level 2 parameter that specifies
the modulo value to use for window rotation. The ACC cards support
both modulo 8 and modulo 128. Default is 8. - l2window
Level 2 parameter that specifies
the maximum number of unacknowledged frames between the DTE and
DCE. Default is 7. On the ACC card, modulo 128 window sizes are
available allowing a window size value of 1-127. - mtu
IP-related parameter. Specifies
the maximum number of octets that may be transmitted in one IP packet. Default
is 2048. - l3_modulo
Level 3 parameter that specifies
the modulo value to use for window rotation. The ACC cards only
support modulo 8. - neg_inpacketsize
Specifies the default maximum
size, in octets, of a level 3 inbound packet when flow control negotiation
is on. This value is used as the “opening bid” in connection establishment
and the “counter offer” for incoming connections if
their “opening bid” is higher. Valid values are 16, 32, 64, 128, 256, 512, 1024, 2048
or 4096 octets. Default value is 128. - neg_inthruputclass
Specifies the level 3 parameter
for the rate of data transmission, in bits per second, that is allowed inbound
on a switched virtual circuit when throughput class negotiation
is enabled. This value is used as the “opening bid” in
connection establishment and the “counter offer” for
incoming connections if their “opening bid” is higher. Valid values are 75, 150, 300, 600, 1200, 2400, 4800, 9600,
19200, 48000, 64000, 128000, and 192000 or the corresponding CCITT
class numbers 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 respectively.
Default value is 19200 (class 11). - neg_inwindow
Specifies the default maximum
number of unacknowledged inbound packets between the DTE and the
DCE when flow control negotiation is turned on. This value is used
as the “opening bid” in connection establishment and
the “counter offer” for incoming connections if their
“opening bid” is higher. Any value from 1 to 7 may
be specified. Default value is 2. - neg_outpacketsize
Specifies the default maximum
size, in octets, of a level 3 outbound packet when flow control
negotiation is on. This value is used as the “opening bid” in connection
establishment and the “counter offer” for incoming
connections if their “opening bid” is higher. Valid values are 16, 32, 64, 128, 256, 512, 1024, 2048
or 4096 octets. Default value is 128. - neg_outthruputclass
Specifies the level 3 parameter
for the rate of data transmission, in bits per second, that is allowed outbound
on a switched virtual circuit when throughput class negotiation
is enabled. This value is used as the “opening bid” in
connection establishment and the “counter offer” for
incoming connections if their “opening bid” is higher. Valid values are 75, 150, 300, 600, 1200, 2400, 4800, 9600,
19200, 48000, 64000, 128000, 192000 or the corresponding CCITT class
numbers 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 respectively.
Default value is 19200 (class 11). - neg_outwindow
Specifies the default maximum
number of unacknowledged outbound packets between the DTE and the
DCE when flow control negotiation is turned on. This value is used
as the “opening bid” in connection establishment and
the “counter offer” for incoming connections if their
“opening bid” is higher. Any value from 1 to 7 may
be specified. Default value
is 2. - networktype
Specifies the network interface
type. (Supported values are DTE_80, DCE_80, DTE_84 and DCE_84.)
Default is DTE_84. - name
Specifies the programmatic
access name used for level 3. Default is x25pgmaccess, however a
unique name for each X.25 link in the system must be assigned. - pvc_inpacketsize
Specifies the default maximum
size, in octets, of a level 3 inbound packet on a permanent virtual
circuit. Valid values are 16, 32, 64, 128, 256, 512, 1024, 2048
or 4096 octets. Default value is 128. - pvc_inwindow
Specifies the maximum number of unacknowledged outbound
packets between DTE and DCE on a permanent virtual circuit. Any value from 1 to 7 may be specified. Default is 2. - pvc_outpacketsize
Specifies the default maximum size, in octets, of
a level 3 outbound packet on a permanent virtual circuit. Valid
values are 16, 32, 64, 128, 256, 512, 1024, 2048 or 4096 octets.
Default value is 128. - pvc_outwindow
Specifies the maximum number of unacknowledged outbound
packets between DTE and DCE on a permanent virtual circuit. Any value from 1 to 7 may be specified. Default is 2. - n2
Retransmission count specifies
the maximum number of times a given frame may be transmitted before
an error condition is identified. The valid range is limited to
1-31. Default is 20. - reverse_charge_accept
Specifies whether or not
reverse charging is accepted. Default is disabled. - t1
The t1 parameter specifies the amount of time to
wait for acknowledgment of a HDLC frame. The ACC Mux subsystem uses
different units to set this value than the other X.25/9000 interface
cards. The closest approximation to the value specified will be
used. The algorithm used by the ACC Mux subsystem for setting t1
is listed below. Default value is 3000 ms. 20 ms. £ t1 £ 1260 ms.
Nearest
20 ms. increment is used. 200 ms. £ t1 £ 12600 ms.
Nearest
200 ms. increment is used. - t2
The T2 timer parameter specifies
the amount of time available at the DTE or DCE/remote DTE before acknowledging
frame must be initiated in order to ensure its receipt by the DCE/remote
DTE or DTE, respectively, prior to Timer T1 running out at the DCE/remote
DTE or DTE. Note that timer T2 must be less than T1. The value used
is T1/2. - t3
The t3 (DCE) / t4 (DTE) parameter
is a level 2 parameter to specify the line idle time. It is used
to identify an excessive period of no-activity on the data link,
suggesting a possible faulty data link or physical link condition.
The value of T3/T4 should be greater than T1 and may be very large
for applications which are not concerned with early detection of
faulty data link or physical link conditions. - thruputclass
Specifies if throughput class
negotiation is allowed between peers. Default is off. - X.121
Specifies the X.121 address
for the subsystem. No default value. - X.121_packet
Specifies the X.121 packet
address of some networks having special characteristics, such as
TransPac. Default value is the X.121 address.
| | | |  | NOTE: Each X.25 link must have a unique X.121 address for
connection to a data network. | | | | |
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