Nortel-networks NN43001-563 Manual de usuario descargar pdf (Pagina 96)

96 ITG engineering guidelines

The number of VoIP users (telephones) is the potential population

in the system that can generate/receive trafﬁc through the IP Trunk

3.01 (and later) node. This number may be estimated for a new

Meridian 1 customer.

If the installation is for an existing customer, base the VoIP trafﬁc on

measured route trafﬁc from trafﬁc report TFC002, which provides

CCS for each route. A customer must determine the amount of

expected private network voice trafﬁc.

Calculate Fax on IP trafﬁc

CCS/user sending fax = # of pages sent/fax * Average Time to send

a page (default 48 seconds)/100

CCS/user receiving fax = # of pages received/fax * Average Time

to receive a page (default 48 seconds)/100

Total fax CCS (Tx) = CCS/fax sent*No. of users sending fax +

CCS/fax received* No. of users receiving fax

The user sending or receiving a fax can be the same person or

different persons. It is the number of faxed documents and the

average number of pages per faxed document that are important.

The time unit for fax trafﬁc is also the busy hour. The busy hour

selected must be the hour that gives the highest combined voice

and fax trafﬁc.

Total the ITG CCS.

Total IP Trunk 3.01 (and later) trafﬁc (T) = Tv + Tx

Refer to Poisson P.01 table to ﬁnd IP Trunk 3.01 (and later) ports

required to provide a blocking Grade of Service of 1% assuming

Poisson random distribution of call origination and zero correlation

among calls.

A lower Grade of Service, such as P.10, may be preferred if overﬂow

routing is available through the PSTN, circuit-switched VPN, or ITG

ISL TIE trunks.

For P.01 blocking Grade of Service, the number of trunks (IP Trunk

3.01 (and later) ports) in Table 10 "Trunk trafﬁc – Poisson 1% blocking

Grade of Service" (page 99) which provides a CCS higher than T is

the solution. For P.10 blocking Grade of Service, refer to Table 11

"Trunk trafﬁc – Poisson 10% blocking Grade of Service" (page 100).

Calculate bandwidth output. Refer to Table 17 "Silence Suppression

disabled TLAN Ethernet and WAN IP bandwidth usage per IP Trunk

3.01 (and later) " (page 113) (Silence Suppression disabled). Tv/36

and Tx/36 indicate the average number of simultaneous callers.

Nortel Communication Server 1000

IP Trunk Fundamentals

NN43001-563 01.01 Standard

Release 5.0 30 May 2007

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