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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Preparing for Installation and Upgrades
1-11Determine ATM Switch Suitability
1
UNKNOWN
means that special engineering is required for this application
because of the transit traffic. The special treatment is necessary because the
feasibility depends on the volume of the transit traffic. Making any of the changes
suggested for
NO
above might make it feasible regardless of the transit traffic.
Constraint tests
If your calculations do not yield a
YES
, this section provides the resources of
which you are short. These tests check 7 ATM switch resource limitations against
6 different application scenarios. A 1 in the Test Results (Table 1-7
) indicates a
passed test; a 0 indicates a failed test. To achieve a
YES
feasibility, all 42 tests
must pass. To achieve a
PROBABLY
, only 21 tests (indicated in
bold
) must
pass.
Table 1-4. Constants
Timeslots per port network 500
Cache hit ratio 50%
EAL+PACL bandwidth 96
Table 1-5. Computed values
Number of nonlocal port networks 13
Effective number of port networks for PP 24
Effective number of port networks for PMP 24
Number of available timeslots 10064
Per-port SVCs (PP+PMP) needed 572
PP SVCs perPN 3
Total PP SVCs 72
PP cells per second required over trunks 15158
Aggregate cells per second available over trunks 366792
Bandwidth-limited maximum phone calls over trunks 2032
Timeslot-limited maximum phone calls over trunks 3000