Hmmm. I haven't seen the "P-level" phrase in a long time, but I distinctly
remember it being in a marketing brochure produced by Cerfnet called "The
Manager's Road Map To The Internet." I dug around and found a copy. Here's
what the author says:
"Availability in relation to dial up connectivity is measured by the number
of busy signals encountered in 100 attempts to connect. It is expressed as
a 'p level' of service where p.05 is equal to five busies per 100 attempts.
Ask your ISP what 'p level' they grade their dial up service to. An ideal
level for business use is p.02. An acceptable level is p.05. Anything
greater is unacceptable for business use."
Your customer is asking whether your level of service will provide him with
only 1 busy signal per 100 attempts to connect.
Damien
Ground Zero Communications, Inc.
[Above citation copyright 1996 CERFnet]