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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
1-12Determine ATM Switch Suitability
1
Final notes
The goal is to engineer the network so that in all reasonable applications, you
always run out of DEFINITY time slots before running out of ATM switch
resources. This is required to provide acceptable service to the customer.
These calculations factor in phone calls only. There is no specific
accommodation for the ATM SVC cache, or for special features such as music,
announcements, and group paging. The theory behind using 500 as the number
of timeslots in a port network rather than the real number (484) is to allow for a
normal amount of these special features. If you use multiple music on hold, group
paging, and so forth, you may need special engineering.
This calculator determines that an application is
PROBABLY
feasible if it can
handle reasonable activity mixes. The three columns in Table 1-7
that have bold
entries define what is meant by reasonable. These tests require that the switch
be able to handle a complete suite of 2-party calls, a complete suite of 3-party
calls, and a mixed suite that involves some calls of each type. For best results,
your application should pass all the constraint tests.
Any ATM switch that processes transit traffic (that is, connections that do not
either originate or terminate on any of the port networks directly attached to it)
may require special engineering. This is possible if the number of trunks on the
Table 1-6. Application scenarios
Number of 2-party calls 2516 0 0 0 0 1258
Number of 3-party calls 0 1118 0 0 0 279
Number of 4-party calls 0 0 629 0 0 78
Number of 5-party calls 0 0 0 402 0 25
Number of 6-party calls 0 0 0 0 279 18
Table 1-7. Test results
Constraint 1: Timeslots 11
111
1
Constraint 2: PMP roots 11
111
1
Constraint 3: PP 11
111
1
Constraint 4: PMP leaves 11
110
1
Constraint 5: PMP endpoints 11
111
1
Constraint 6: Total SVCs 11
111
1
Constraint 7: Per-port SVCs 11
111
1
Constraint 8:Performance 11
111
1
Constraint 9:Trunk bandwidth 11
111
1