PEB2054 Просмотр технического описания (PDF) - Infineon Technologies
Номер в каталоге
Компоненты Описание
производитель
PEB2054 Datasheet PDF : 269 Pages
| |||
1.7 System Integration and Application
The main application fields of the EPIC are:
– Digital line cards with different architectures,
– Central control units of key systems,
– Analog line cards,
– Concentrators.
PEB 2055
PEF 2055
Overview
1.7.1 Digital Line Card
1.7.1.1 Switching, Layer-1 Control
The EPIC provides a switching capability for up to 32 digital subscribers between the
PCM system highway and the IOM-2 interface (64 B-channels). Typically it switches
64-kbit/s channels between the PCM and the IOM-interfaces. Moreover it is able to
handle also 16-, 32- and 128-kbit/s channels.
The signaling handler supports the command/indication (C/I) channel which is used to
exchange predefined layer-1 information with the transceiver device.
A monitor handler supports the handshake protocol defined on the IOM-monitor channel.
It allows programming of layer-1 devices which do not have a dedicated µP interface.
The EPIC can be operated in tandem, i.e. one device is active, another one is a backup
device. The backup device can instantaneously take over from the active device when
the active device fails. Due to this tandem operation capability and the high number of
ISDN subscribers which can be connected to one EPIC, the use of single line cards is
feasible.
Several line card architectures are possible.
1.7.1.2 Decentralized D-Channel Handling
In completely decentral D-channel processing architectures (see figure 6), the
processing capacity of the line card is usually designed to avoid blocking situations even
under maximum conceivable D-channel traffic conditions. In such an architecture the
EPIC switches the B-channels and performs C/I and monitor channel control.
The IDECs handle the layer 2 functions for signaling and data packets in the D-channel.
They transfer the extracted data via the µP and an HDLC controller, e.g. the HSCX (High
Level Serial Controller Extended SAB 82525) to the system. One of the channels of the
HSCX may access either a time slot of programmable bandwidth on one of the system
highways or a separate signalling highway.
In both cases the highway capacity used for packet traffic can be shared among several
line cards due to the statistical multiplexing capabilities of the HSCX.
Semiconductor Group
18
Share Link: 