Browse Prior Art Database

Initialization Procedure for a B-loop Single-station Access Unit

IP.com Disclosure Number: IPCOM000099383D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Related People

Grady, PE: AUTHOR

Abstract

Disclosed is a procedure for initializing a B-Loop Single-Station Access Unit (SSAU), running IBM Token-Ring signals, without using a dedicated hardware reset tool (1).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 92% of the total text.

Initialization Procedure for a B-loop Single-station Access Unit

       Disclosed is a procedure for initializing a B-Loop
Single-Station Access Unit (SSAU), running IBM Token-Ring signals,
without using a dedicated hardware reset tool (1).

      The procedure uses existing hardware and software, including an
attaching device and diagnostic program (a PC, Token-Ring Adapter
Card, and the Ring Diagnostic program or equivalent), to initialize
the SSAU before connecting it to the main ring.  The diagnostic
program initiates the phantom drive signal, which resets the relay
inside the access unit (2, 3).  The initialization is done on a test
ring with the hardware shown in the figure.

      The unit to be initialized is SSAU 1.  The Ring-In (RI) and
Ring-Out (RO) terminals are connected through either a jumper cable
or a second SSAU, as shown.  The lobe receptacle has a self-shorting
feature when unplugged; however, the RI and RO terminals do not.

      Once the diagnostic program is started, it indicates, through
appropriate interpretation of its messages, if SSAU 1 successfully
attached to the test ring.  The second SSAU (or patch cable) is then
unplugged, breaking the signal path on the test ring, causing the
diagnostic program to post an error indicating the ring is open.
Exiting the diagnostic program completes the initialization
procedure. References

      (1)  IBM Token-Ring Network Installation Guide, IBM publication
#GA27-3678.
    (2) ...