Protection
Use the Protection subtab to view, create, edit, and delete node protection groups.
 
Item
Description
Type
Displays the protection group type:
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1:1—(ONS 15454 only) A working electrical card is paired with a protect electrical card of the same type. If the working card fails, the traffic from the working card switches to the protect card. 1:1 protection groups are created automatically and do not require provisioning. There are two sets of paired expansion slots for the electrical cards. Card slots 1 and 2 are a pair and slots 5 and 6 are a pair. The pairing is due to the configuration of the backplane connectors. When two electrical cards are plugged into either of the card slot pairs, a 1:1 protection group is automatically created for the two cards, if possible. The 1:1 automatic protection group is created when the second electrical card of a pair is either plugged in or is preprovisioned. The 1:1 protection group cannot be deleted.
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1:N—(ONS 15454 only) Allows a single card to protect up to five working cards of the same DS-N level. A DS1N-14 card protects DS1-14 cards, a DS3N-12 card protects DS3-12 cards, DS3N-12E cards protect DS3-12E cards, and DS3i-N-12 cards protect other DS3i-N-12 cards.
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1+1—A working OC-N port is paired with a protect port of the same type.
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Y Cable—(ONS 15454 only) A protection group for transponder or muxponder cards that are connected to a Y-cable. The cable splits the single client signal, sending one signal to the working transponder or muxponder card, and the second signal to the protect card.
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Splitter—Appears automatically when a TXPP_MR_2.5G or MXPP_MR_2.5G card is installed. These cards contain two trunk ports that provide trunk-side protection in dense wavelength division multiplexing (DWDM) networks.
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1+1 Optimized—(ONS 15454 only) For the ONS 15454, 1+1 optimized can be used with the OC-3-4, OC-3-8, MRC-12, and MRC-2.5G-4 cards. Ports must be provisioned to SDH. Optimized 1+1 protection is mainly used in networks that have linear 1+1 bidirectional protection schemes. Optimized 1+1 is a line-level protection scheme that includes two lines, working and protect. One of the two lines assumes the role of the primary channel, from which traffic gets selected, and the other port assumes the role of the secondary channel, which protects the primary channel. Traffic switches from the primary to the secondary channel based on either an external switching command or line conditions. After the line condition or the external switching command that was responsible for a switch clears, the roles of the two sides are reversed.
Name
Displays the protection group name. If the name is not defined by the user, the protect card slot and card name appear.
Protect
Displays the protect slot (for 1:1 and 1:N), or the protect card and port (for 1+1, Optimized 1+1, and Y Cable).
Working
Displays the working slot, card, and port.
Bidir Switch
Indicates whether a 1+1 protection group has bidirectional switching turned on. If it is on, both transmit (Tx) and receive (Rx) signals switch to the protect port when a failure occurs to one signal.
Revertive
Indicates whether the protection group is revertive, that is, whether traffic reverts to the working card or port after failure conditions remain corrected for the amount of time entered in the Rev Time field.
Rev Time (min)
Displays the number of minutes that must pass before the traffic reverts to the working card. Traffic can revert when conditions causing the switch are cleared. Available when Revertive is checked for 1:1, 1+1, and Y Cable protection. Always available for 1:N and 1+1 Optimized protection.
Verification Guard Time (sec)
(1+1 Optimized only) The range is 500ms to 1s. A verification guard timer is used to ensure the acceptance of a Force switch command from the far end node. When the Force command is received, if no Lockout is present or if Secondary section is not in a failed state, then the outgoing K1 byte is changed to indicate Force and the verification guard timer is started. If a Force switch command is not acknowledged by the far end within the verification guard timer duration, then the Force command is cleared.
Recovery Guard Time (sec)
(1+1 Optimized only) The range is 0s to 10s. The default is 1 second. A recovery guard timer is used for preventing rapid switches due to SD/SF (Signal Degrade/Signal Failure) failures. After the SD/SF failure is cleared on the line, a recovery guard timer is started. Recovery guard time is the amount of time elapsed before the system declares that a condition is cleared after the detection of an SD/SF failure.
Detection Guard Time (sec)
(1+1 Optimized only) The range is 0s to 5s. The default is 1 second. The detection guard timer is started after detecting an SD, SF, loss of signal (LOS), loss of frame (LOF), or alarm indication signal–line (AIS-L) failure. Detection guard time is the amount of time elapsed before a traffic switch is initiated to a standby port after the detection of an SD, SF, LOS, LOF, or AIS-L failure on the active port.
Create
Displays the Create Protection Group dialog box to create a new protection group.
Edit
Displays the Edit Protection Group dialog box to edit the highlighted protection group.
Delete
Deletes the highlighted protection group.
Help
Displays context-sensitive help

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