PEF 20550 H V2.1 Infineon Technologies, PEF 20550 H V2.1 Datasheet - Page 27

• Manufacturer Part Number: PEF 20550 H V2.1
• Description: IC INTERFACE CTRLR PCM MQFP80
• Manufacturer: Infineon Technologies
• Series: ELIC®r

Specifications of PEF 20550 H V2.1

• Function: Line Card Controller
• Interface: ISDN, PCM
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-SQFP
• Includes: Change Detection, Power-Up Reset Generation
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Other names: PEF20550HV2.1XT; PEF20550HV21XP; SP000007794; SP000007795

D-channel processing is supported by multiple different architectures:
1.6.1.2 Decentralized D-Channel Processing, Multiplexed HDLC-Controller.
Typically the D-channel load has a very bursty characteristic. Taking this into account,
the ELIC provides the capability to multiplex one HDLC-controller among several
subscribers. This feature results in a drastical reduction of hardware requirements while
maintaining all benefits of HDLC based signaling.
A D-channel arbiter is used to assign the receive and transmit HDLC-channel
independently to the subscriber terminals.
In downstream direction the arbiter links the transmit channel to one or more (broadcast)
programmable IOM-2 D-channels (ports).
In upstream direction the arbiter assigns the HDLC-receive channel to a requesting
subscriber and indicates to all other subscribers that their D-channels are blocked, using
a control channel.
This configuration supports full duplex layer-2 protocols with bus capability e.g. LAPD or
proprietary implementations. Consequently no polling overhead is necessary providing
the full 16-kbit/s bandwidth of the D-channel for data exchange.
Figure 7
D-Channel Handling with a Multiplexed HDLC-controller
Semiconductor Group
IOM -2
Interface
µP
R
D Channel
27
SACCO CH-A
SACCO CH-B
B Channels
ARBITER
D Channel
Controlling
ELIC
EPIC
R
R
ITS05808
PCM
Highway
Signaling
Highway
PEB 20550
PEF 20550
Overview
01.96