pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 193

• Manufacturer Part Number: pef20550
• Description: Extended Line Card Interface Controller Elic
• Manufacturer: Infineon Technologies Corporation

The terminal version of the IOM
ISDN terminal and NT1 applications. It consists of three IOM channels, each containing
four 8 bit timeslots. The resultant data transfer rate is therefore 768 kBit/s and the data
is clocked with a 1536 kHz double rate clock (DCL). The IOM channel structure is similar
to the line card case. The first channel is dedicated for controlling the layer-1 transceiver
(monitor and C/I channels) and passing the user data (B and D channels) to the layer-1
transceiver. The second and third channels are used for communication between a
controlling device and devices other than the layer-1 transceiver, or for transferring user
data between data processing devices (IC channels). The C/I channel of the third IOM
channel is used for TIC bus applications (D and C/I channel arbitration). The TIC bus
allows multiple layer-2 devices to individually gain access to the D and C/I channels
located in the first IOM channel.
Finally, for NT1 applications, it is also possible to operate the IOM-2 interface at a data
rate of 256 kBit/s (1 IOM channel). This is sufficient for the simple back to back
connection of layer-1 transceivers in Network Terminator (NT) and Repeater (RP)
applications.
The following table summarizes the different operation modes and applications of the
IOM-1 and IOM-2 standards (TE = Terminal Equipment, NT = Network Terminator,
LT = Line Terminator):
Table 22
Overview of IOM
Mode
IOM-1
Multiplexed IOM-1
IOM-2
IOM-2
IOM-2
The main application of the ELIC is on digital and analog line cards. The ELIC is
therefore primarily designed to support the line card modes (2048 kBit/s) of the IOM-2
standard. It can however be programmed to support all the above mentioned IOM data
rates and C/I and monitor processing schemes. However, it must be assured that the
desired PCM to IOM data rate ratio is feasible (refer to chapter 5.2.2.3).
Semiconductor Group
®
Applications and Data Rates
Applications
TE, NT, LT
LT
LT
TE, NT
NT
®
-2 is a variation of the line card bus, designed for
193
Data Rate / Clock Rate
256 kBit/s / 512 kHz
2048 kBit/s / 4096 kHz
2048 kBit/s / 4096 kHz
768 kBit/s / 1536 kHz
256 kBit/s / 512 kHz
Application Hints
PEB 20550
PEF 20550
01.96