PEF2256 INFINEON [Infineon Technologies AG], PEF2256 Datasheet - Page 96
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PEF2256
Manufacturer Part Number
PEF2256
Description
E1/T1/J1 Framer and Line Interface Component for Long- and Short-Haul Applications
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.PEF2256.pdf
(518 pages)
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an external second timer is possible which has to be provided on pin SEC/FSC.
Selecting the external second timer is done with GCR.SES. Refer also to register GPC1
for input/output selection.
4.3.6
The FALC
and loop-down (deactivate) pattern with bit error rates up to 10
in-band loop code is selected by LCR1.FLLB. Replacing transmit data with the in-band
loop codes is done by programming FMR3.XLD/XLU.
The FALC
loop-down pattern (LCR1.LLBP = 1). The loop-up and loop-down pattern is individually
programmable from 2 to 8 bits in length (LCR1.LAC1/0 and LCR1.LDC1/0).
Programming of loop codes is done in registers LCR2 and LCR3.
Status and interrupt status bits inform the user whether loop-up or loop-down code has
been detected.
4.3.7
The transparent modes are useful for loop-backs or for routing data unchanged through
the FALC
In receive direction, transparency for ternary or dual-/single-rail unipolar data is always
achieved if the receiver is in the synchronous state. In asynchronous state data is
transparently switched through if bit FMR2.DAIS is set. However, correct time slot
assignment cannot be guaranteed due to missing frame alignment between line and
system side.
Setting of bit LOOP.RTM disconnects control of the internal elastic store from the
receiver. The elastic buffer is now in a “free running” mode without any possibility to
update the time slot assignment to a new frame position in case of resynchronization of
the receiver. Together with FMR2.DAIS this function can be used to realize undisturbed
transparent reception.
Transparency in transmit direction can be achieved by activating the time slot 0
transparent mode (bit XSP.TT0 or TSWM.(7:0)). If XSP.TT0 = 1 all internal information
of the FALC
register TSWM the S
transparently from port XDI to the far end. For complete transparency the internal
signaling controller, idle code generation and AIS alarm generation, single channel and
payload loop-back have to be disabled.
User’s Manual
Hardware Description
®
®
®
56.
56 also offers the ability to generate and detect a flexible in-band loop-up and
In-Band Loop Generation and Detection
Time Slot 0 Transparent Mode
56 generates and detects a framed or unframed in-band loop-up (activate)
®
56 (framing, CRC, S
i
-bits, A-bit or the S
a
/S
i
-bit signaling, remote alarm) is ignored. With
a
-bits can be enabled selectively to send data
96
Functional Description E1
-2
. Framed or unframed
DS1.1, 2003-10-23
PEF 2256 H/E
FALC
®
56
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