Frequently Asked Questions About the FCP
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/056-15
Beta Draft Confidential
What are the performance limitations of the FCP?
Under certain conditions, the FCP experiences performance limitations. Possible
performance-limiting conditions are:
• Increasing the number of VCs slightly affects performance on the FCP.
• Enabling the EFCI check affects performance because of increased processing
requirements. There is an extra check to determine if the EFCI bit is set.
• The IOM performs RM cell generation as a background process. Therefore,
decreasing the generation interval has little impact on data throughput. Increasing
the data rate has an impact on RM cell generation, because there are fewer cycles
left for background processing.
How many logical ports can I configure?
CBX 500 3-Port Channelized DS3/1 IMA IOM
Based on performance testing, Lucent provides the following guidelines for logical
port configuration when utilizing the ATM FCP on the 3-Port Channelized DS3/1
IMA IOM.
Configuration Options
The FCP subsystem for the 3-Port Channelized DS3/1 IMA IOM was designed to
support a variety of distinct T1 channels and/or IMA groups. IMA groups can bundle
up to eight T1 channels to form a single entity. The following logical port
configuration options are available:
Default Configuration — The FCP allocates a default amount of 1K cell buffer
memory per provisioned logical port, IMA group, or DS1 channel. Therefore, 64K
cells (the maximum available port buffering on the FCP subsystem) are allocated per
3-Port DS3/1 IMA IOM. Each logical port can have either a distinct T1 channel or an
IMA group containing up to eight T1 channels. Lucent does not recommend using the
maximum default cell buffer threshold when provisioning more than 64 logical ports.
User-defined Configuration — You can configure more than 64 logical ports with a
corresponding number of T1 and/or IMA groups by assigning less than 1K to each
logical port.
CBX 3500 3-Port Channelized DS3/1 Enhanced IMA Module
Based on performance testing, Lucent provides the following guidelines for logical
port configuration when utilizing the ATM FCP on the 3-Port Channelized DS3/1
Ehanced IMA module on the CBX 3500 switch.
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