Specifications

3-2
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 3 Shelf Configuration Rules
Shelf Rules for PSMs
• Connect west to east, never west to west or east to east, between nodes in a ring.
• Connect Thru OUT to Thru IN between the OADM modules for ring configurations.
For examples of OADM module cabling in a protected ring configuration, see Figure 1-17 on page 1-30.
Rules for Protected Configurations
The rules for OADM modules in protected configurations are as follows:
• You must use two OADM modules that support the same channel band.
• If the OSC is used for APS channel protocol messages, the OADM modules must both support the
OSC.
In trunk fiber protected configurations, only one OADM module can be used in single shelf
configurations because the PSM (protection switch module) occupies one of the subslots in slot 0.
Shelf Rules for PSMs
For trunk fiber protection to function when the PSM (protection switch module) is connected to an
OADM module, the OSC or the in-band message channel (or both) must be available on the shelf. If the
OSC is present, the PSM must connect to an OADM module that supports the OSC if it is a multiple
shelf node. If the PSM connects to an ITU trunk card, use the in-band message channel as the APS
message channel to support trunk fiber protection. If the PSM connects to a transponder line card, use
IP for the APS message channel.
Shelf Rules for 2.5-Gbps ITU Trunk Cards
The rules for 2.5-Gbps ITU trunk cards are as follows:
• The 2.5-Gbps ITU trunk cards must support channels in the same 4-channel band supported by the
OADM module.
• Two OADM modules are required when configuring splitter protection.
Shelf Rules for Transponder Line Cards
The rules for transponder line cards are as follows:
• When using y-cable protection, ensure that both transponder line cards are the same type
(single-mode or multimode) for a given client signal. For example, if client signal A connects by a
y-cable to transponders in slot 2 and slot 3, then both of those transponder line cards must either be
single-mode or multimode.
• The transponder line cards must support channels in the same 4-channel band supported by the
OADM module.