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capacityTri-plex performs capacity analysis of all system components. This includes evaluating such elements as network loading, peak and average bandwidth requirements (T1s), disk size, memory size and the speed and number of the CPUs required. The process addresses all interactions of the system hardware and software as they operate under the expected system load. For example, no VIP in a pair should carry more than its predefined load-sharing capacity at its peak. This assures that the entire peak capacity can be assumed by the remaining VIP's should the need arise. The SIUs interface with the signaling network and the VIPs. The SIU is normally implemented as a dual redundant pair and has a minimum capacity that exceeds 100 calls per second. Maximum capacity of an SIU pair is about 500 calls per second. Normally the maximum number of SIU pairs per system is two. VIPs provide the call processing and billing functions and include up to 8 E1 / T1 interfaces for the Interactive Voice Response (IVR) functionality. VIP capacity is rated at 20,000 calls per hour. The number of VIPs per system is engineered for N plus K sparing. Any VIP can perform the IVR function for any call so that the amount of E1 / T1 resources can be engineered based on blocking probability. Administration workstations perform the network management functions such as provisioning and reporting. Typically one administration workstation is adequate. The database server capacity exceeds 800,000 busy hour calls and
normally only one is required for a customer network. It is equipped
with enough memory and storage for several million subscribers.
As long as there is enough drive space available, there is no limit
to the number of subscribers we support. For example, the system
uses approximately 50GB of disk space to store 3,800,000 subscribers
at 100 calls and 2 refills per month with 30 days of stored calls.
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