Power Redundancy on PTX10004 and PTX10008

Source Redundancy

The JNP10K-PWR-AC3 PSM has four inputs, and enabling source redundancy ensures the reliability of the system. When source redundancy is enabled, it applies to all PSMs in the chassis.

If you have two independent power sources (source A and source B), you can have two sets of independent power feeds—one from source A and one from source B. To provide source distribution redundancy capability to the power supply, you must connect the feed from source A to terminal A0 or/and A1, and the other feed from source B to terminals B0 or/and B1.

Please note the following conditions before setting up the source redundancy:

• At present, the software supports only one redundant source. For example, source A (main source) along with source B (backup or redundant source).

• Each JNP10K-PWR-AC3 power supply in the chassis should have two inputs connected to Source A and the remaining two inputs connected to Source B.

• By default, source redundancy will be disabled. A CLI knob is provided to the user to enable source redundancy, which must be set by the user

• Source redundancy is only applicable if all the PSMs in the system are JNP10K-PWR-AC3 PSMs. If there is a mix of JNP10K-PWR-AC2 PSMs in the system, “PSM Source Redundancy Unsupported PSM” alarm will be raised.

• The user must ensure that the feed distribution is even.

• Source redundancy cannot be used in conjunction with feed redundancy, and vice versa. Therefore, feed redundancy must be disabled before enabling source redundancy. To disable feed redundancy, use the following CLI command.

• The DIP switches for all four PSM input feeds should be set to the "feed expected" position, otherwise, the

  alarm will be raised in the system.

Please note the following conditions after setting up the redundancy feature:

• The Power Manager will only consider the capacity of each Obsidian PSM as 2-feed capacity. Please refer to <Hardware guide link> for more information

• If any one of the source becomes unavailable, the PSM platform software will raise an feed-missing alarm corresponding to the failed feeds of connected source for all PSMs. Also there will be a “PSM Source Redundancy Failure” alarm and Source redundancy will be disabled in the system, until user fix the source failure

• Keep in mind that enabling source redundancy will result in a reduction of overall system power capacity to protect against a source failure

• When source redundancy is enabled at the configuration level, the software will simulate the feature and determine the new system power capacity. If the system’s new power capacity cannot accommodate the existing system load, source redundancy will not be applied. In such cases, “Psm Source Redundancy Unsupported” alarm will be raised and system will continue to operate in normal mode

• When a PSM fault or failure occurs in the setup after enabling source redundancy and there is no source failure, the system capacity is expected to reduce further. If this new system capacity can’t support existing load, source redundancy feature will be disabled, “Psm Source Redundancy Unsupported” alarm will be raised and system will continue to operate in normal mode. The customer should replace the failed PSM as soon as possible

Feed Redundancy

The JNP10K-PWR-AC3 PSM has four inputs, and enabling feed redundancy enhances the reliability of the system by providing uninterrupted power supply. The four input feeds (A0, A1, B0, and B1) present in the JNP10K-PWR-AC3 enables you to connect four feeds from the one or more power-supplies. when one feed is down, the other feed will continue providing the power and keep the platform live.

For example, if you have two independent power sources (source A and source B), you can have four sets of independent power feeds—two from source A and two from source B. On the power supply, you must connect the feeds from source A to terminal A0 and A1, and the other feeds from source B to terminals B0 and B1. It will provide the feed distribution redundancy capability to the power supply.

Please note the following conditions before setting up the feed redundancy:

• To enable feed redundancy, the PSM must have at least two feeds connected

• Software currently only supports one redundant feed.

• On a PSM, where feed-redundancy to be enabled, DIP switches must be set to the "feed expected" position for both primary and redundant feeds. Else, feed redundancy will not be applied to the system and “PSM %d Feed Switches Wrong for Feed Redundancy” alarm will be raised. User need to make sure, DIP switch config should match appropriate feeds connected (Example: A0 feed to be expected, when A0 feed is connected) when configuring feed redundancy, as this is a prerequisite.

• Feed redundancy will be disabled by default, below CLI knob option will be provided for the user to enable it.

• Feed redundancy cannot be used in conjunction with source redundancy, and vice versa. Therefore, source redundancy must be disabled before enabling feed redundancy. To disable source redundancy, use the following CLI command.

Please note the following conditions after setting up the feed redundancy feature:

• The Power Manager will calculate the capacity of the Obsidian PSM with feed redundancy enabled by subtracting one feed from the number of connected feeds. Please refer to the <hardware link> for more information.

• If the redundant feed becomes unavailable, the PSM platform software will raise an feed-missing alarm corresponding to the failed feed for the feed-redundancy enabled PSM. Also there will be a “PSM %d FEED RED FAILURE” alarm and Feed redundancy will be disabled for that PSM, until user fix the feed failure

• Keep in mind that enabling feed redundancy will result in a reduction of overall system power capacity to protect against feed failure.

• When feed redundancy is enabled at the configuration level, the software will simulate the feature and determine the new system power capacity. If the system’s new power capacity cannot accommodate the existing system load, feed redundancy will be disabled for all the PSMs, with alarm “PSM Feed Redundancy Unsupported” and system will continue to operate normally.

• When a PSM fault or failure occurs in the setup after enabling feed redundancy and there is no feed failure, the system capacity is expected to reduce further. If this new system capacity can’t support existing load, feed redundancy feature will be disabled, “Psm Feed Redundancy Unsupported” alarm will be raised and system will continue to operate in normal mode. The customer should replace the failed PSM as soon as possible.

  Note:

  Feed-redudancy is unsupported for Joule/Scapa PEM variants & Obsidian Active blank PSM Module (ABPM). In Junos, if feed-redundancy is applied on these unsupported PEM variants, it will ignored and a print will be available in LCMD logs for debug purpose