IBM 3745 Problem Determination Manual page 188

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Host Messages
Usage Tier Problems
Beginning with NCP Version 5, usage tiers are available to give you more
flexibility in selecting the option that best suits your needs. This flexibility allows
you to select the optimal NCP adapted to the 3745 configuration.
The usage tier is defined at NCP generation in the USGTIER keyword belonging
to the BUILD macro.
Throughout the next tables the following terms are used:
LSS Low-speed scanner
HSS
High-speed scanner
TRA
Token-ring adapter
ELA
Ethernet LAN adapter
CA
Channel adapter
Chapter 2. Host Messages
2-3