Configuration / GPON OLT Redundancy

The system supports GPON type B redundancy as specified in the ITU-T G.984.1 standards specification.

Type B GPON redundancy doubles both the OLT ports on the GPON line card and the optical fiber between the OLT ports and the optical splitter which is closest to the OLTs. You must use a splitter with two input/output ports on the OLT side. Outages on fiber from the OLT to the first splitter can be recovered from; With Type B redundancy there is no redundancy from the splitter to the ONT.

With GPON type B redundancy, a GPON redundancy group can have two GPON OLT ports and the two GPON OLT ports must be on different GPON line cards. The ports can be on a 4 port or 8 port GPON line card. So even though the cards themselves are not redundant, their ports may be. Two 4 port GPON line cards can provide redundancy for a single 8 port GPON line card. Since it is port level redundancy and not card level redundancy, the port numbers on one card do not need to match the port number on the second card.

A single GPON port cannot be configured in two groups at the same time.

When the GPON ports in a GPON redundancy group are added, the active and standby port are based on whether they are added as a primary or secondary interface in the Configuration / GPON / Port / OLT / Redundancy. If you reboot the system (or reboot both cards which have the redundant ports), the OLT port which comes up first and is able to pass traffic will be the active port.

In a redundancy group one OLT port is always assigned as active and the other standby. If an active OLT port fails, the standby takes over and becomes active. Note that OLT redundancy is non-revertive; that is, a previously active OLT port which has failed does not become active when the reason for the failover is resolved. The current active port will stay active until that port/line fails, then the standby (if the initial issue was resolved) will once again become the active port.

When a standby port is added to the redundancy group and comes up, the card with the active port copies over the configuration database and routing tables t the standby OLT port on the second card. As configuration changes aremade to the active port, the standby port is automatically updated.

To update the displayed settings, click the Refresh button.

Slot Displays the slot number and the card description.

Port OLT port number.

Type

Whether the OLT is primary or secondary in the redundancy group.

Oper State

Current redundancy configuration for this interface.

Values:

inactive: interface is registered as part of a redundancy group, but it is neither active nor standby.

standby: interface is acting a standby for an active interface.

active: interface is either not part of a redundancy group or it is the active interface in a redundancy group.

unavailable: status not available.

Oper Status

Current status of this interface.

values:

Active: interface means line is up as standalone or the working line in a redundant pair

OOS: interface is out of service.

trafficDisabled: interface is up and acting as a standby interface.

unavailable: status not available

 

March 24, 2012