HP 3000 Manuals HP 3000 Manuals
Differences in X.25 Support
There are differences in X.25 support between NS3000/V and NS3000/iX
which need to be considered when you migrate as described in the
following paragraphs.
1980 vs. 1984 CCITT
NS3000/V supports CCITT 1980 and NS3000/XL supports both 1980 and 1984.
General Level 3 Differences
In MPE V X.25, a Reset is sent to initialize or clear a Permanent Virtual
Circuit. In MPE/iX X.25, a Reset is not sent to initialize or clear a
Permanent Virtual Circuit.
MPE V X.25 has a timeout on an interrupt collision. MPE/iX X.25 does
not.
Level 3 Access with NetIPC
In addition to the X.25 features supported on NS3000/V, NetIPC 3000/XL
provides the following CCITT 1984 features:
* Fast select.
* The capability of modifying and reading the facility field in call
packets.
* A new option in IPCDEST (called the destination network address
option) allows you to directly specify an X.25 address or PVC
number instead of a remote node name. See the NetIPC3000/XL
Programmers Reference Manual for more information. If using this
feature, you can configure POOL as an X.25 Address Key with its
security option set to "O" (outbound) in the X.25 SVC Address Key
Paths screen to allow outbound calls to any destination address.
* IPCCONTROL request 12, reason for error or event, on NS3000/V can
return 14 (network shutdown), 15 (restart sent by local network),
16 (level 2 failure), 17 (restart sent by local protocol module),
and 18 (restart packet received). IPCCONTROL on NS3000/XL only
returns 10 (Clear), 11 (Reset), or 12 (Interrupt).
* In NS3000/V, IPCSHUTDOWN does not complete until a clear
confirmation arrives. In NS3000/XL, IPCSHUTDOWN completes
immediately.
* In NS3000/V, IPCCREATE requires that the network name be padded
with nulls. In NS3000/XL, IPCCREATE requires the network name be
padded with blanks.
Facilities
Following are the supported facilities of the DTC/X.25 XL Network Link.
Supported Facilities 1984 CCITT X.25 Reference
Extended packet sequence numbering 6.2
Incoming calls barred 6.5
Outgoing calls barred 6.6
Nonstandard default packet size 6.9
Nonstandard default window size 6.10
Flow control parameter negotiation 6.12
Throughput class negotiation 6.13
Closed user group selection (1980 CCITT) 6.14
Fast select request and acceptance 6.16-17
Reverse charging and acceptance 6.18-19
Local charging prevention 6.20
Hunt group 6.25
Supported Facilities with X.25 Level 3 Programmatic Access
Closed user group related facilities 6.14
Bilateral closed user groups 6.15
Network user identification 6.21
Called line modified address notification 6.26
Call redirection and notification 6.25-27
Transit delay selection and indication 6.28
Security
When configuring a host, you can now set security for each remote system
using the Security field on the X.25 SVC Address Key Paths screen.
System to System Local User Groups (LUGs) are now assigned on the DTC
instead of on the host. The LUG provides security in the same way a CUG
does, but you don't have to subscribe to a CUG.
PAD Support
For complete information on migrating PAD support from NS3000/V to
NS3000/iX Release 2.0, refer to appendix E.