Duplicated Hardware
Issue 4 May 2002
6-7
555-233-123
Each switch has three positions:
■
SPE-A (the left position)
■
AUTO (the middle position)
■
SPE-B (the right position)
To hard-select SPE A as the Active SPE, both SPE Select switches must be
moved one at a time to the SPE-A position. To hard-select SPE-B as the Active
SPE, both SPE Select switches must be moved to the SPE-B position. Any other
combination of SPE Select switches leave control of the Active SPE to the system
software.
Inter-Cabinet Cable
As described previously, the ICC connects the two TN772 Duplication Interface
circuit packs and is a basis of support for the Duplication Interface circuit pack
functionality described previously.
The ICC carries leads related to maintaining a High or Critical Reliability system.
The SPE Select lead indicates which SPE is the Active SPE. The Tone-Clock
Select leads indicate which Tone-Clock circuit pack is active. SPE Select switch
state leads indicate the position of the SPE Select switches. Emergency Transfer
leads indicate whether Emergency Transfer is on or off in the PPN cabinet. Other
leads “combine” the INADS, CDR, and the Customer-Provided Alarming device
channels from the two Maintenance/Tape Processors.
The ICC also carries an indication of whether memory shadowing is enabled or
disabled. Information to be shadowed is sent over the serial link between
Duplication Interface B and Duplication Interface A; this serial link is carried over
the ICC.
Communication between software on the Active SPE and the Standby SPE is
sent over the serial link between Duplication Interface A and the
Maintenance/Tape Processor in carrier B. This serial link is also carried over the
ICC.
The presence of the ICC also causes ID pins on the backplane to indicate that the
system is a high or critical reliability system rather than a standard reliability
system.
The ICC is difficult to connect, and its proper connection is critical to the operation
of the system. Refer to the
Summary of Contents for Definity SI
Page 1: ...0DLQWHQDQFH IRU YD D 1 7 6HUYHU 6 Volumes 1 2 and 3 555 233 123 Issue 4 May 2002...
Page 62: ...Maintenance Architecture 555 233 123 1 26 Issue 4 May 2002...
Page 92: ...Management Terminals 555 233 123 3 26 Issue 4 May 2002...
Page 204: ...Routine Maintenance Procedures 555 233 123 5 100 Issue 4 May 2002...
Page 250: ...LED Interpretation 555 233 123 7 10 Issue 4 May 2002...
Page 2804: ...Maintenance Object Repair Procedures 555 233 123 10 2018 Issue 4 May 2002...