Cyan Z-Series Engineering and Planning Guide Release 5.0
Page 138 © 2013 Cyan, Inc. – All Rights Reserved. 700-0023-05-00 Rev. 1
2.22 Optical Protection Groups
Planet Operate provides non-revertive 1+1 optical protection groups for DWDM/CWDM DTM-8, SFT-8,
and SFT-10G16 optical ports. Optical protection groups, created in conjunction with the passive Cyan
Transport Protection Module (TPM), provide reliable protection for facility and hardware failures.
1+1 protection transmits a diversely routed copy of the traffic on working and protection channels. The
receiver determines which traffic signal to accept based on the signal quality, i.e. signal degrade, signal fail.
Cyan optical protection groups support unidirectional switching mode that allows only the affected
direction of the transmission to be switched.
Note: Some of the early manufactured Cyan Transport Protection Modules are labeled as "OPM."
2.22.1 Optical Protection Groups Equipment
Transport Protection Module
The Transport Protection Module (TPM) provides optical protection capabilities with the Cyan Z-Series
packet-optical transport platform. Working in conjunction with the Z-Series multi-port transponder
modules, the TPM provides facility and/or equipment protection for wavelength services, including 1G to
2.5G (GbE, OC-48/STM-16, 1/2G FC) as well as 10G (10 GbE, OC-192/STM-64) optical services.
The TPM flexible optical protection capabilities make it ideally suited for applications when just a single,
un-protected port is available on the client-side device (switch or router), including:
• Data center connectivity
• Enterprise sites
• Co-location facilities
The TPM fully passive design avoids the need for an active protection switch – eliminating a single point of
failure. The unit provides sub-50 ms protection switching.
The TPM leverages the compact LGX form-factor, allowing up to three units to be housed in a 1
RU high
frame (shelf). For detailed information on installing the passive LGX frame, see the applicable Z-Series
shelf installation and safety guide.
Configuration Example
Optical protection groups require a single TPM connected to the client third-party device, one or two
DTM-8 module (or one or two SFT-8 modules or one or two SFT-10G16 modules), and two Z-Series
transport modules.
The example optical protection group configuration in the figure below shows a single client interface
(third-party device) connected to the TPM add/drop port, the working DTM-8 client port connected to the
TPM West port, a protect DTM-8 client port connected to the TPM East port, and DTM-8 associated trunk
ports connected to their respective LAD-8i transport modules. One LAD-8i module provides DWDM
transport for the working path in the West direction and the other LAD-8i module provides transport for the
redundant protected path in the East direction.
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