PEB2260N

Manufacturer Part NumberPEB2260N
DescriptionPLCC-28
ManufacturerInfineon Technologies AG
PEB2260N datasheet
 

Specifications of PEB2260N

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1
Introduction
1.1
General
The introduction of digital switching systems has led to a significant reduction of the central
part of the hardware constituent. In order to achieve further integration at the periphery, i.e. at
the interface to the analog subscriber, the state of the art is to split up the analog subscriber
circuit into a line driver and sensor chip (solid state SLIC: Subscriber Line Interface Circuit) on
the one hand and a signal processor (in our case SICOFI) on the other; an even more cost
effective possibility is to use a dual channel SICOFI
(SICOFI-2) and two SLIC’s for a group of two analog subscribers.
In this note, we will call SLIC the combination of the solid state SLIC and the other discrete
components which are not integrated and have an influence on the transmission
characteristics.
We will call Subscriber Line MODULE the combination SLIC + SICOFI.
The aim of this paper is to describe an example of design of such a module for given
specifications. It includes the corresponding hardware, the calculations necessary to build up
a mathematical model of the SLIC, the software using this model and the results of the
calculations with the SLIC and SICOFI software, which will permit to adapt the module to the
specifications.
The Siemens SIgnal processing COdec FIlter (SICOFI) PEB 2060 is a fully integrated PCM
Codec (coder/decoder) and transmit/receive filter produced in an advanced low power CMOS
technology.
It can be used in combination with a variety of solid state Subscriber Line Interface Circuits
(SLIC).
This note describes an example of application with the ERICSSON SLIC PBL 3762 which
allows a compact and low cost realisation of PABX subscriber line cards.
Other realisations (e.g. in central offices) are also possible with the full feature Ericsson SLIC’s
PBL 3736 and 3739. The corresponding software will be included in an other application note.
The combination of SICOFI and PBL 3762 provides a costeffective solution because few ex-
ternal components are necessary and a high flexibility because of the flexibility of the digital
signal processing:
– The ERICSSON PBL 3762 performs BORSCHT functions as loop current, resistive battery
feed, ring relay driver and signaling functions as well as signal transmission including 2- to
4-wire and 4- to 2-wire conversion. The 2-wire termination impedance ("hybrid function" or
"impedance matching") is adjustable by external impedances.
– The PEB 2060 (SICOFI) consists of several digital filters (Z,B,GR,GX,R and X-filters), which
provide software controlled adjustment of the analog behavior of the digital switching
system.
– These adjustments include improved hybrid function ("Z-filter"), transhybrid balancing
function ("B-filter") as well as frequency correction ("R and X-filters") and level control in
receive and transmit direction ("GR and GX-filters").
Semiconductor Group
Application Notes II
503