Cyan Z-Series Engineering and Planning Guide
Release 5.0
P a g e
140
© 2013 Cyan, Inc. – All Rights Reserved.
700-0023-05-00 Rev. 1
2.22.2 Optical Protection Groups – Rules and Guidelines
Note: Planet Operate typically presents you with provisioning options that adhere to the rules and
guidelines described below when creating optical protection groups.
Follow the rules and guidelines below when planning and provisioning optical protection groups.
•
DTM-8, SFT-8, and SFT-10G16 modules support optical protection groups.
•
DTM-8 (or SFT-8 or SFT-10G16) ports used to create optical protection groups can be configured
on ports collocated on the same module.
•
A DTM-8 (or SFT-8 or SFT-10G16) port can only participate in one optical protection group.
•
If an optical protection group exists on a DTM-8 (or SFT-8 or SFT-10G16) module, the protect card
of the working line card must be the only protect card for other optical protection groups on the
working card.
•
If an optical protection group (working and protect) is initially created from ports collocated on the
same DTM-8 (or SFT-8 or SFT-10G16) module, additional ports on this module can only
participate in optical protection groups created on this module.
•
You must provision an optical protection group instance at the near-end node and the far-end node.
•
OTU2 or OTU2e is the preferred signal type for optical protection groups. An end-to-end signal
type of OTU2 or OTU2e provides the ability to monitor Alarm Indication Signal (AIS), Signal
Degrade (SD), and degrade conditions used in the protection switching process.
•
1+1 configurations are supported for optical protection groups. 1+1 protection transmits a copy of
the traffic on both the working and protection channels. The receiver determines which traffic
signal to accept based on the signal quality.
•
Optical protection groups are unidirectional. For a unidirectional failure (i.e. a failure affecting only
one direction of the transmission), only the affected direction of the transmission is switched to
protection.
•
Optical protection groups are non-revertive. When a failure occurs and the traffic switches from the
working facility to the protect facility, the traffic stays switched to the protect facility until it is
manually switched back or if a higher priority failure occurs.
•
An SFT-8 client port participating in a cross-connection cannot be included in an optical protection
group. Delete the cross-connection prior to creating the optical protection group.
•
To forward transport faults, such as LOS, to the far-end of an SFT-8 optical protection group, select
(check) the
Laser Shutdown as FDI
check box on the General tabs of the local and remote SFT-8
fiber ports participating in the optical protection group and the applicable SFT-8 fiber ports in all
transit nodes (hops) in the network.
Upgrading a Z-Series Shelf to CyOS Software Version 4.0 (or higher)
When upgrading a Z-Series shelf to software version 4.0 or higher, all previously installed DTM-8 and
SFT-8 line cards will be upgraded to include the complex programmable logic device (CPLD) code that
supports the full optical protection (dual card) feature using the TPM. However, for the CPLD code installed
on the DTM-8 and SFT-8 line cards during the Release 4.0 (or higher) system upgrade to take effect, the
DTM-8 and SFT-8 line cards require a hard reset. This is a service-affecting process and should only be
done during a scheduled maintenance window.
New DTM-8, SFT-8, and SFT-10G16 line cards with software version 4.0 (or higher) installed do not
require a hard reset.
