Teledyne 6 RU Chassis, Руководство по эксплуатации

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6 RU SSPA Chassis Operations Manual 202058 REV AA 57
2.4 N+1 Operational Basics (Single Unit)
A single SSPA unit may be operated in N+1 mode in order to take advantage of the
Auto Gain Control features described in
Section 2.3.6.6.3
. In this case, each SSPA
module within the SSPA chassis is counted as a separate N+1 entity. For example, a
two-module 4RU chassis acts like a two-way N+1 array.
N+1 array indexing also accounts this type of functioning. Each 4RU chassis occupies
a segment of N+1 addressing equal to the number of modules; i.e., 2 modules = 2
addresses.
The remaining N+1 functions remain the same. When one of the internal modules
develops a failure, it will be forced to mute by the internal SSPA controller. The unit will
develop a summary alarm, but will remain in N+1 master mode (if it was prior to
failure). Multi-module units will delegate a new master mode only when all internal
modules develop a failure.
Note
: With multi-module RM SSPA chassis configurations, the N+1 sys-
tem will require fewer chassis to form a N+1 redundancy array.
Examples of 4-way N+1 systems:
•
1 four-module 6RU, 7RU or 10RU chassis;
•
2 two-module 4RU or 3RU chassis;
•
4 one-module 4RU or 3RU chassis.
2.5 N+1 Operational Basics (Two or More Units)
A system which utilizes two or more SSPA chassis in an N+1 configuration may be
operated directly from the front panel as if it was a single very high power SSPA. Any
SSPA chassis in the system can serve as the Master SSPA single point of control.
2.5.1 Selecting the Master Unit
The selection of the Master chassis is fully automatic and shifts from one 4RU SSPA
chassis to another based on the priority ranking assigned to the modules comprising
each SSPA unit. A lower priority index number (referred hereafter as the N+1 Address)
means a higher rank in the N+1 hierarchy. The fault-free unit with the lowest N+1 ad-
dress is selected as the N+1 Master unit. The remainder of the units become N+1
Slave units.
Slave unit settings are under full control of the Master unit. Any system-related setting
change made on the Master unit automatically propagates to the Slave units to keep
all units under N+1 control in sync.