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The LayerRule form is accessed from the IMS Main Menu, by first selecting Circuit, and then Speeds in the dropdown lists

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Create a new LayerRule by selecting the New down arrow in the button bar, followed by New LayerRule

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This opens up the New LayerRule popup window – seen below

Circuit Speed

The name of the speed that this Layer Rule will apply

ChannelType

The name to be displayed in the Speed Form’s Carrier Layer and Sub Layer tabs that best describes their Speed’s channelization i.e., CH, CBL (Cable), MHZ, FREQ, etc.

NumberOfChannels

The subdivision of this speed in terms of channel numbers i.e., a STS1 will have 28 channels.

CarrierSpeed

The parent speed i.e., a STS3 (itself has 3 channels of STS1)

AllowDuplicateChannels

Allows for multiple circuits to use the same channel. For the more dynamic type of speeds. Not used for fixed channel type technologies.

AllowChannelZero

Enable sub circuits to use channel zero on circuits with this speed

AllowProtection

Allow circuits with this speed to be protected in IMS – option to choose working or protection path (W/P) chooses a different sequence number in the carrier circuit

AllowLessChannels

In very rare cases, allow for circuits with this speed to use less channels on carrier circuits

AllowScatteredChannels

Allow sub circuits to occupy non contiguous channels on circuits with this speed

StartChannels

The channel numbers that a sub circuit can use on a carrier circuit using this speed i.e., a carrier circuit of speed OC192 will only allow a sub circuit of speed STS48 to start on its channel numbers 1, 49, 97, and 145 as a STS48 will consume 48 contiguous channels on its carrier (parent).