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SNA Protocol Support 19

X.25/QLLC

X.25 is a widely supported internetworking protocol used by private and public

telecommunications networks. X.25 is designed to carry high volumes of data

quickly and without errors, and uses packet-switching to transmit data between

connected computers.

Eicon Networks’ products comply with X.25 network standards in over 45

countries and adhere to GOSIP (Government Open Systems Interconnection

Profile) requirements.

For SNA (System Network Architecture) communications over an X.25

connection, Eicon SNA Gateway uses the QLLC (Qualified Logical Link

Control) protocol. QLLC is SNA data packaged for transmission over an X.25

network.

An X.25/QLLC line can support multiple logical connections over a single

physical link. Once Eicon SNA Gateway is connected to the X.25 network, it

can then link to any X.25-attached IBM host. You must, however, make sure

that Network Packet Switching Interface (NPSI) is running on the front-end

processor (FEP) of the host. NPSI is an IBM program that allows IBM host

applications running VTAM to communicate over X.25-compliant networks.

This IBM program runs in an IBM communications controller with the

Network Control Program (NCP). NPSI is required to implement QLLC and

allow 3725 or 3745 FEPs to be accessible via an X.25 network.

X.25

Packet-Switched

Network

X.25 Link

(QLLC)

IBM AS/400

3745 (NPSI)

IBM Mainframe

X.25 Link

(QLLC)

X.25 Link

(QLLC)

Client Workstation

(SNA LAN Gateway only)

Gateway PC

Client Workstation

(SNA LAN Gateway only)

Client Workstation

(SNA LAN Gateway only)

Making an X.25 connection using Eicon SNA Gateway

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Eicon Networks C21 Guia de Instalação Página 19