Mitel SX-200 EL Technician's Handbook page 18

Technician's Handbook
As a guideline to achieve a P.0001 grade of service (one
failure in 10,000 calls) for a bay connected via a Control
Triple FIM Carrier, the recommended maximum
calls/hour is 500 based on traffic tables. With a typical
call hold time of 2 minutes and 12 seconds the total
Erlang rate is 18.33 (660 CCS) for the whole bay. The
half bay would therefore be 9.17 Erlangs (330 CCS) at
250 calls/hour. It is important that calls be evenly
distributed across all bays.
If you provide three links to each bay
Maximum channel blocking ratio is 0.94.
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Connectivity from the Peripheral Bays
Peripheral bays connect to the main control cabinet with the use of an
interface module on the Peripheral FIM Carrier II card, Peripheral
Interface Module Carrier card (PIMCC), BCC III, or PRI card. The
Peripheral FIM Carrier II card supports a FIM. The PIMCC, BCC III, or
PRI card support a FIM II or a CIM. A FIM II or CIM sits on a PIMCC
when the peripheral cabinet does not have a BCC III.
Remember to use the same distance variant of FIM or FIM II
at both ends of the cable. You can connect a FIM to a FIM II.
.
Remember that the system sees the PRI card as a separate
bay and therefore a PRI card in a peripheral cabinet must
always have its own interface module (FIM II or CIM).
Remember that the CIM suits co-located systems; not remote
systems. The CIM comes in only one variant. The CIM
supports a distance of up to 30 meters or 100 feet between
cabinets.
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