WAN Subsystem Configuration and Management Manual

Overview of the WAN Subsystem

WAN Subsystem Configuration and Management Manual—522463-011

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SWAN Firmware File

The SWAN firmware file is the 510 disk file that resides on an

Integrity NonStop NS-series server or NonStop S-series server disk file and is

downloaded to the SWAN concentrator. The SWAN firmware file contains the

following:

•

SWAN Bootcode (T7954), which is written into the flash programmable memory

(PROM) on each CLIP on the SWAN concentrator. This file contains:

SWAN Loader (T7955), which tests the SWAN concentrator hardware with the

power-on self-test (POST) and then copies the SWAN Kernel file from

essential flash PROM into dynamic random access memory (DRAM) for faster

execution.

SWAN Kernel (T7848), which is downloaded through the KERNELCODE

attribute of the Subsystem Control Facility (SCF) ADD ADAPTER command,

the OSM Service Connection, or the TSM Service Application (G-series RVUs

only). The SWAN Kernel file resides in the essential part of the flash PROM.

•

SWAN Firmtask (T5814), which is downloaded into the SWAN concentrator’s

DRAM along with the PROM image. This file updates the flash image in the SWAN

concentrator’s flash PROM.

Updating SWAN concentrator firmware is described in the SWAN Concentrator

Installation and Support Guide.

Data Link Control (DLC) Tasks

The DLC tasks support the equivalent to Layer 2 of the ISO/OSI Seven-Layer Model.

Each DLC task controls one line interface. DLC0 task runs on WAN port 0 and DLC1

task runs on WAN port 1. More than one type of DLC task can run in the same CLIP.

Downloading the DLC software to the SWAN concentrator is initiated when an SCF

START LINE command starts a data communications line. Lines are started using the

SCF interface that is provided for the data communications subsystem. The ConMgr

process, the WAN manager process, the TFTP server process, and the TFTP client

running in the SWAN concentrator firmware work together to control the downloading

of the DLC task files to the SWAN concentrator.

The WAN driver software provides a procedure interface for use by the DLC tasks to

access the SCC3 and SCC4 interfaces to the two WAN ports on each CLIP. In

addition, the CAP/CLIP interface procedures are called by the DLC tasks to perform

certain functions, such as providing support for updating the SWAN concentrator IP

addresses.