Link Modes

You can access the Link Modes parameters window from the Link Editor window.

The parameter values are stored in the link configuration files /etc/opt/SUNWconn/x25/config/link_config_nnnn.cfg, where nnnn is the four-digit number that indicates the link number (for example, the file link_config_0004.cfg contains the parameters for link number 4).

These parameters deal with options and requirements of the PSDN to which you are connecting.

Allow omission of diagnostic packets (acc_nodiag)

Allow the omission of the diagnostic byte in incoming Restart, Clear and Reset Indications.

Use diagnostic packets (use_diag)

Force the use of the diagnostic byte in incoming Restart, Clear and Reset Indications.

Restrict Clear Lengths (ccitt_clear_len)

Restrict the length of a Clear Indication to 5 bytes and Clear Confirm to 3 bytes. This parameter only applies to 1980 networks.

Disallow diagnostic packets (bar_diag)

Disallow the use of the diagnostic byte in incoming Restart, Clear, and Reset Indications.

Discard diagnostics on non-Zero LCN (disc_nz_diag)

Some PSDNs use channels other than zero to transmit diagnostic information. This parameter lets you discard this information, should you need to.

Allow hex digits in DTE addresses (acc_hex_add)

Use this parameter if you want to be able to use addresses that do not conform with the X.121 specification.

Bar nonprivileged listeners (bar_nonpriv_listen)

Only the superuser can start a process, like the PAD daemon, that "listens".

Strict ISO8882 Conformance (iso_8882_mode)

This parameter is for test purposes only.

Keep X.121 address in Call Request to LAN(send_x121_to_lan)

Includes X.121 address in X.25 packet.

Insert X.121 address in Call Indications from LAN (insert_x121_from_lan)

Inserts the X.121 address into Call Indications.

Process Priority According the DATAPAC (1976) rules (datapac_priority)

Apply the rules used by the 1976 Datapac recommendations to calls.

Prioritize International Calls (intl_prioritised)

Some networks let you give priority to international calls. If you set this parameter, you need to set Priority Encoding. See Table 7-3 for information.

Priority Encoding (prty_encode_control)

The value of this parameter determines Solstice X.25's action with respect to prioritizing international calls.

Table 7-3 lists the available choices:

Table 7-3 Priority Encoding

Priority Encoding Parameter	Parameter Value	Meaning
No special action	0	Solstice X.25 performs no special encoding.
DATAPAC Priority Bit	1	The software encodes the priority request using the DATAPAC Priority Bit (1976 version).
DATAPAC Traffic Class	2	Priority request encoded using the DATAPAC Traffic Class (1980 version using the Calling Network facility marker).

Outgoing International calls (intl_addr_recogn)

The value of this parameter determines how outgoing international calls are handled.

Table 7-4 lists the available choices:

Table 7-4 Outgoing International Call Parameters

Outgoing International Call Parameter	Parameter Value	Meaning
Not distinguished:	0	No special action taken for international calls.
Check National DNIC:	1	Solstice X.25 compares the DNIC in the called address to the local DNIC. The software assumes that a mismatch indicates an international call.
Prefix digit of 1	2	The software assumes a called address with a prefix of 1 indicates an international call.
Prefix digit of 0	3	The software assumes a called address with a prefix of 0 indicates an international call.

National DNIC (dnic)

Enter your national DNIC number. You must enter this code if you choose Check National DNIC in the Outgoing International calls menu.

Forced Packet Size (prty_pkt_forced_value)

This sets the packet size for all priority call requests and incoming calls. The possible values are: Default, 16, 32, 64, 128, 256, 512, 1024, 2048, and 4096.

In the configuration file, the packet sizes are expressed as powers of 2. For example, to specify 128, enter 7.

Source Address Control (src_addr_control)

Determines the value inserted in the calling address field of outgoing call requests over a WAN link. It does not apply to LAN links.

The choices as shown in Table 7-5 are:

Table 7-5 Source Address Control Parameters

Source Address Control Parameter	Parameter Value	Meaning
No special action	0	Solstice X.25 puts the calling address in the outgoing call request exactly as it receives it from an application making the call.
Omit calling address	1	Solstice X.25 sets the calling address to null in the outgoing call request, regardless of what was specified by the calling application.
Default to local address	2	Solstice X.25 uses the local address as the calling address if no calling address is supplied by the application.
Force use of local address	3	Solstice X.25 uses the local address as the calling address, even if a calling address is supplied by the application.

The term local address refers to the value of the Local Address parameter in the Interface Configuration window.