NEC SL2100 Features And Specifications Manual page 57

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System Capacity

AspireNet allows a maximum of 50 systems to be networked. Each system will require a VoIPDB,

which by default will provide 16 channels to be shared for all IP related devices (e.g. IP Phones, IP

Trunks, AspireNet).

Network Requirements

The voice quality of VoIP depends on variables such as available bandwidth, network latency, and

quality of service initiatives (QoS), all of which are controlled by the network and internet service

providers. Because these variables are not within NEC's control, the performance of the users IP-

based voice solution cannot be guaranteed. Therefore, NEC recommends connecting the VoIP

equipment through a fully managed data network with Quality of Service (QOS) implemented.

For a network to be suitable for VoIP it must pass specific requirements. The requirements are:

• One way delay must not exceed 150 ms

• Round trip delay must not exceed 300 ms

• Packet loss must not exceed 1 %

• Data switches must be manageable

• No half-duplex equipment may be present in the network

• Routers must provide QOS

Depending upon how the QOS policies are built in the network, assignments may be needed in the CPU

(PRG 84-10).

• Adequate bandwidth for the estimated VoIP traffic must be available

See below chart for bandwidth calculations.

Below is a chart that shows the average bandwidth per VoIP call over Ethernet.

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