Browse Prior Art Database

Workstation Auto Configuration in a Dual Cabling Environment

IP.com Disclosure Number: IPCOM000108777D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 110K

Publishing Venue

IBM

Related People

Dancker, GA: AUTHOR [+4]

Abstract

This article describes a workstation controller (WSC) which supports two types of communication cables concurrently for attaching non-programmable terminals (NPTs). The WSC detects NPTs which attach to either cable type and also can report errors if NPTs are attached to both cable types at the same address.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Workstation Auto Configuration in a Dual Cabling Environment

       This article describes a workstation controller (WSC)
which supports two types of communication cables concurrently for
attaching non-programmable terminals (NPTs).  The WSC detects NPTs
which attach to either cable type and also can report errors if NPTs
are attached to both cable types at the same address.

      This article describes a workstation controller (WSC) which
attaches multiple non-programmable terminals (NPTs) via two different
types of communication cables concurrently:  standard cable and
fiber- optic cable.  The WSC has 8 ports where each port can attach
NPTs via either standard cable or fiber-optic cable, but not both.
Up to 7 NPTs can attach per port; each NPT on the port has a
different address.  The WSC has 56 different port/station addresses.

      The WSC has 8 standard ports and a fiber-optic connector.  The
cable from the WSC to the 8-port demultiplexer is a pair of fiber-
optic cables - one for transmit, one for receive.  Six ports are
multiplexed (or fiber-optic ports); the other two use standard cable
to attach to the NPTs located near the WSC (see the figure).

      The WSC supports full auto-configuration.  Each time an NPT
powers up or down, the host is notified.  The WSC guarantees a
powered-up NPT will be reported to the host within 10 seconds.

      The WSC licensed internal code (LIC) labels each port as
"standard," "fiber-optic," or "don't know" (depending on the
existence of a powered-up NPT).  If an NPT is powered-up on a
standard cable, the port is labeled as "standard" (similarly for
fiber-optic). Continued

      All unused addresses on "standard" ports and "fiber-optic"
ports are polled within 10 seconds.  If the port is "don't know" (no
NPT powered-up on the port), the port is polled in both methods
within 10 seconds.  If a NPT is detected, the port is then labeled as
"standard" or "fiber-optic."  Each time an NPT powers down, if this
was the last powered-up NPT on the port, the port is labeled as
"don't know."

      The WSC LIC performs the following functions:
o  The LIC sets the WSC hardware to poll in a standard method.
o  The WSC polls each unused address on a "standard" port and all
addresses on a "don't know" port.  If no response is received, the
LIC proceeds to the next port/station address.  If a poll response is
received, the host is notified, the port is labeled as "standar...