PEF20550HV21XT Lantiq, PEF20550HV21XT Datasheet - Page 193

• Manufacturer Part Number: PEF20550HV21XT
• Manufacturer: Lantiq

Specifications of PEF20550HV21XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Mode
IOM-1
Multiplexed IOM-1
IOM-2
IOM-2
IOM-2
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
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
LT
TE, NT, LT
LT
TE, NT
NT
®
-2 is a variation of the line card bus, designed for
193
256 kBit/s / 512 kHz
Data Rate / Clock Rate
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