PEB2055 Просмотр технического описания (PDF) - Siemens AG

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PEB2055

Extended PCM Interface Controller EPIC®-1, EPIC®-S

Siemens AG 

PEB 2055

PEF 2055

Overview

1.7.1.4 Mixed D-Channel Processing, Signaling Decentralized,

Packet Data Centralized

Another possibility is a mixed architecture with centralized packet data and decentralized

signaling handling. This is a very flexible architecture which reduces the dynamic load of

central processing units by evaluating the signaling information on the line card, but does

not require resources for packet data handling. Any increase of packet data traffic does

not necessitate a change in the line card architecture, the central packet handling unit

can be expanded.

In this application IDECs are employed to handle the data on the D-channel. The IDECs

separate signaling information from data packets. The signaling messages are

transferred to the µP, which in turn hands them over to the group controller using the

HSCX.

The packet data is processed differently. Together with the collision resolution

information it is transferred to one IOM-2 port of the EPIC. The EPIC switches the

channels to the PCM-highway, optionally combining four D-channels to one 64-kbit/s

channel. In this configuration one IOM-2 interface is occupied by IDECs, reducing the

total switching capability of the EPIC-1 to 24 ISDN-subscribers.

IOM R -2 Interface

p - Data

P + Coll

P

Sig.

Data

IDEC R

IDEC R

B, P, C

EPIC R

Example Frame Structure

B B ... B P B C B

Packet

Data

PCM

Highway

Collision

Data

Signaling

µP

HSCX

S Signaling

Highway

ITS09536

Figure 8

Line Card Architecture for Mixed D-Channel Processing

Semiconductor Group

21

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