PEF2054NV21XT Infineon Technologies, PEF2054NV21XT Datasheet - Page 113

• Manufacturer Part Number: PEF2054NV21XT
• Manufacturer: Infineon Technologies

Specifications of PEF2054NV21XT

• Lead Free Status / Rohs Status: Compliant

PEB 2055
PEF 2055
Application Hints
FC Mode 3
FC mode 3 can be used for IOM-2 applications, but it should be noted that some IOM-2
layer-1 transceivers will interpret an FSC pulse of only one DCL period as a superframe
marker (e.g. SBCX PEB 2081, IEC-Q PEB 2091, … ), and it is not allowed to provide a
superframe marker in every frame. For these applications it is recommended to use
either FC mode 6 or FC mode 7.
FC Mode 4
FC mode 4 applies for special SLD applications like 2 ISAC-S devices connected to one
SIP line. Usually each SIP line carries the two 64 kbit/s B channels followed by a feature
control and a signaling channel. The feature control and signaling channels however are
not required for all applications. This is, for example, the case if a digital subscriber circuit
(S- or U- layer-1 transceiver) is connected via an ISDN Communication Controller
(ICC PEB 2070) to the EPIC. The task of the ICC is to handle the D-channel and to
switch the B1 and B2 channels from the SLD to the IOM-1 interface. The capacity of such
an SLD line card can be doubled if the unused time slots for the feature control and
signaling channels are also used as 64 kbit/s B channels. This is possible if the
additionally connected ICC (or ISAC-S) is synchronized with an FSC that is delayed by
2 time slots i.e. the rising FSC edge is at the beginning of time slot 2 instead of 0. The
CFI time slots 2, 3, 6 and 7 can then be programmed as normal B channels within the
EPIC instead of being programmed as feature control and signaling channels.
FC Mode 6
This is the most often used type of FSC signal, because it covers the standard IOM-1,
IOM-2 and SLD applications. The rising edge of FSC marks time slot 0, bit 7 of the CFI
frame.
The pulse width is 32 bits or 4 time slots, i.e. the FSC is symmetrical (duty cycle 1:1) if
the CFI frame consists of 8 time slots (SLD), and the FSC is high during the first IOM-2
channel if the CFI frame consists of 32 time slots (IOM-2).
Semiconductor Group
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