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C578M-A (4/05) 31
SECTION 4.0: APPENDICES
INTRODUCTORY REMARKS
All appendices (except
Appendix 4.5
), focus on specific installation issues or various situations of
interest to the user. Each deals with a separate aspect of integrating the current HS into the described
system environment. For completeness, all possibilities of interest are listed here, although some of
the topics have already been discussed thoroughly in the manual.
Appendix 4.5
extends the brief data cable parameter statement made in
Section 1.0 Introduction
,
1.4 Subunit Highlights
. Additional items related to data port cable specifications are covered.
APPENDIX 4.1 HS ADDITION TO AN EXISTING CONFIGURATION
(No Hot Switch Currently Installed)
Adding a hot switch to an existing system configuration that has no hot switch can increase the number of
Sercom ports required beyond the obvious one-port increase needed when the hot switch is added. Issues
associated with Sercom port requirements are discussed in the first section below. The second section
deals with SEU port requirement issues based upon the final Sercom port population.
Sercom Port Requirements
The “final count” for the number of Sercom ports required (on each duplicate switch**) can vary depend-
ing upon your current system configuration (prior to adding a hot switch). At a minimum, the final
Sercom port count will increase by one, as noted in the previous paragraph.
If an existing CC1 has two Sercom cards, and all 16 ports are used, then adding a hot switch will require
the addition of another Sercom card. That means three Sercom cards are installed in each switch.
The number of Sercom ports required (starting from your current base count) increases by “one” for
each of the following circumstances that apply:
• Addition of the hot switch = 1 port
• Connection to a network (NIU) = 1 port
If your standalone configuration is to become one of several nodes on a network, the connection to
the NIU will require a Sercom port. If your configuration was already a node on a network, that port
was included as part of your current base count.
• Access Control Device = 1 port
Any access control device, formerly connected to a CC1 COM port, must now be connected to a
Sercom port on the CC1 unless you have utilized the COM 2 port option described in Figure 1-6
(see item [1] of
Appendix 4.2
for additional information).
If each circumstance above is applicable, the final Sercom port count will be three more than the starting
base number. If the increase in Sercom ports required exceeds the number of ports available, it will be
necessary to add another Sercom card to the 9700-CC1 (as well as to the duplicate switch).
** Keep in mind that an additional 9700-CC1 is required when a hot switch is added to a configuration.
The added CC1 is configured as a duplicate backup of the current switch.
SEU Port Requirements
With one exception, the general statement can be made that one SEU port is needed to interface one
Sercom port. The exception arises because all cabling from each Sercom port does not go to an equal
number of SEU input ports. The one-port exception is the data line connection where the hot switch is
attached to the CC1. The addition of the hot switch does use a Sercom port (port 5 on the CC1) on the
CC1-side of the Sercom-SEU port interface. However, the data line coming from that connection does
not go to an SEU port at all. Instead, it goes to a communication port on the CM9760-CCC subunit of
the hot switch. The result is that the total number of SEU ports needed to interface the total number of
Sercom ports on a switch is one less than the Sercom port “final count” (determined above).
NOTE:
An interesting example occurs if you configure a basic CC1 that already utilizes 16
ports. The addition of a hot switch requires 16 + 1 or 17 Sercom ports, which, in turn, requires
the addition of another Sercom card to the CC1. However, you still need only one SEU unit to
interface this configuration (16 ports) as one of the 17 Sercom ports on the CC1-side is not
reflected in the total number of ports required for duplication at the SEU-side. Under this unique
circumstance, an additional SEU unit is not required.
Concluding Remarks
Other than considering port requirements for the CC1, the SEU, and related equipment items, a
duplicate CC1 is necessary (already mentioned). Once all equipment requirements are met, cabling is
installed according to the instructions in the manual. Likewise, identical configuration files are programmed
and loaded onto the interfaced CC1 units. Once these items are taken care of, system power can be
applied and the hot switch will, if configured for default, engage the system in A-side control (Master),
B-side backup (Slave), synchronous-mode operation.