X.25 HOST Networking Access Support (HNAS) - Evolution SNA
Router to Host over IP Network using TCP. - Host runs VTAM ... Two Stages flow control with IBM routers. Multiplex all ... Restored with no SMP under OS/390.
Transports "NPSI non SNA X.25" traffic over TCP/IP
X.25
37XX NPSI
- NPSI to Host over SNA Network - Host runs VTAM and SNA Applications
Channel LAN/WAN
(PCNE,GATE,PAD)
SNA
NPSI Non-SNA Support
HOST VTAM
DTE
HOST HNAS TCP/IP
HNAS replaces NPSI
- Router to Host over IP Network using TCP - Host runs VTAM, SNA Applications, HNAS, TCP/I
Channel LAN/WAN
X.25
Router
DTE
HNAS Definition
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Call it: X.25 Host Network Access Support Runs on S/390 MVS/ESA or VM/ESA Interconnexion between IBM TCP/IP stack and VTAM API Keeps all Applications unchanged: Pelican/Interpel, CFT, CSFI, VIRTEL, IMS, CICS to support GATE and GATE Fast Connect PCNE (LLC0) PAD (LLC5) Integrated PAD (IPAD) Transparent XPAD (XPAD)
X.25 Handling
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0
1
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,
*
(+
+
+
()
*
X.25 Layers 1,2, and 3 run in routers Layer 3 call control in HNAS for PCNE,PAD Call control in CTCP VTAM Application for GATE Router to HOST over TCP/IP XTP for IBM Routers Two Stages flow control with IBM routers Multiplex all VCs over one TCP/IP session XOT RFC1613 for Cisco Routers end to end flow control one TCP/IP session per VC
Host Software Architecture with HNAS Application Application Application Application CTCP
CTCP
VTAM LU Pools LU Pools
PCNE (LLC0)
SNA
Interface
Gate Fast Connect (LLC4)
GATE (LLC4)
Integrated or XPAD
Detail Trace
X.25 NAS for S/390 Alerts
DTE LU Pools
IBM
TCP/IP
Interface
9
:
;
78
6
4
25
5
5
23
4
X.25 over TCP/IP: XTP with IBM Routers, XOT with Cisco Routers
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