User guide

Telephony and Multimedia Services

1/1551-HSC 901 35/3 Uen C 2005-12-02

Telephony over IP (ToIP) is a Voice over IP (VoIP) based carrier class

telephony application. The voice is transmitted in data packets, together

with other data packets, but with higher priority. It can be used for

replacement of POTS, and supports legacy telephony services including

supplementary services (Class 5 services). Services are supported with the

same functions as in local exchanges.

Multimedia services are supported using basic EDA data access. There is

however no higher priority, and the multimedia services are treated as data

applications.

All applications (that is Telephony over IP, Multimedia services and one

base band telephony either POTS or ISDN) may coexist within a single

EDA system and each subscriber can be allowed to access any of the

applications, including all in parallel. It should be noted, that while base

band POTS and ToIP are perceived by the user as high quality telephony,

the multimedia is perceived as lower quality.

8.1 Baseband POTS and ISDN in EDA

EDA innovatively supports base band telephony deployment based on

generic filter/splitter functionality, which separates low frequency analog

speech from high frequency digital ADSL information. A POTS/ADSL

splitter must be deployed at the Customer Premises as well as within the

Central Office (CO) site. The data traffic is delivered into the Ethernet

switch. The base band solution is recommended when an existing

narrowband (PSTN/ISDN) is updated to a broadband connection (ADSL)

and the existing narrowband infrastructure is maintained.

EDA offers IP DSLAM and splitter/filter combinations with either integrated

filters or external filters, as described below.

8.1.1 Baseband Solution with Integrated Filter

The 12-line IP DSLAM EDN312 has built-in base band POTS or ISDN filter,

which simplifies installation compared to an external filter. The EDN312 IP

DSLAM is shown in Figure 49 on page 71 and for an example please see

the EDN288 solution illustrated on Figure 10 on page 19.