System Availability: All systems
In any telephone system, deploying many IP telephones on a data LAN can have some unexpected pitfalls if the network does not have the bandwidth and speed required to handle VoIP traffic. To prevent delay, jitter, and data loss for VoIP traffic and retain the performance of your other business-critical network applications a Network Voice Readiness Assessment must be completed before installing VoIP. Toshiba is not responsible for Network Voice Readiness Assessments.
More information about Voice Readiness Assessment can be found at http://www.netiq.com/ products/vm/whitepapers.asp.
CIX IP provides a number of adjustable tuning parameters dealing with sharing of network resources, collectively referred to as Quality of Service (QoS). Expected voice QoS as it relates to network parameters, including bandwidth, is shown in Table 46 on page 175.
Some CIX IP voice quality adjustable parameters are listed below: System Wide Parameters
| • | Software selectable G.7 11 or G.729A codecs with variable interval timing |
| • | Type of Service (TOS) precedence, delay, throughput and reliability types can be individually selected |
| • | Differentiated Services (Diffserv) can be enabled |
IP Telephone Group Parameters
| • | IP Telephone Groups (CIX670: 256 groups; CIX200, CIX100 and CIX40: 128 groups) |
| • | Voice Packet Transmission Interval |
| • | Jitter buffer type |
| • | Jitter buffer length |
| • | Packet loss threshold |
Priority Control
Priority Control can be enabled system wide. It provides a framework in which voice traffic flowing on an IP network is given priority for processing. The CIX supports IEEE802.1p and Differentiated Services “Diffserv” priority control protocols- selectable. In order to have priority control processing work accurately, network equipment (router, switch, etc.) must support this
function and appropriate service must be ordered from the ISP provider or carrier.
QoS Measurement
eManager can measure the IPT QoS parameters listed below:
| • | Packets (sent/received) |
| • | Delay (msec.) |
| • | Jitter (msec.) |
| • | Loss (%) |
Analog CO Line Interface Compatibility
To provide optimum voice quality of IP telephones and Strata Net IP networks on Strata CIX
systems, there are some compatibility requirements that must be followed when using analog CO line cards in the system.
| • | Toshiba highly recommends only using RCOU3A, RCOS3A, BCOCIU1A, BCOCIS1A, REMU2A (two-wire/four-wire), REMU1A (four-wire), RDDU2A, and RGLU3A analog CO line interfaces in IP phone and Strata Net IP applications. These circuit cards provide optimum speech quality for Toshiba IP telephones. |
| • | Do not use RCOU1A, RCOS1A, REMU1A (two-wire), RDDU1A, RGLU1A, or RGLU2A analog CO line interfaces in IP telephone applications. These circuit cards will work, but will cause IP telephone users to experience unacceptable voice quality and echo return loss. |
| • | CIX40 Base cabinet CO lines, GCDU1A, GCDU2A and GCOCIH1A circuit cards provide optimum speech quality for Toshiba IP telephones. |
Power Over Ethernet System Availability: All systems Toshiba has a strategic relationship with SMC to resell the 24-port, 802.3af certified SMC6824MPE PoE switch (shown right) through authorized Toshiba dealers. |
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The SMC6824MPE PoE switch is sized and priced Figure 25 SMC6824MPE PoE Switch
to fit well with Strata CIX systems to serve
applications in which customers want to power their
IP telephones over Ethernet, instead of using local power with each IP telephone. This switch works with the IP5000-series and IPT 2000-series telephones.
Notes
| • | The 5000-series and 2000-series IP telephones require local power for operation unless connected to a LAN that has been equipped with special equipment to provide telephone PoE. The AC adapter supplied with it powers the telephone and is included in the price. |