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PEB2256HT Datasheet(PDF) 65 Page - Infineon Technologies AG

Part # PEB2256HT
Description  E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications
PDF  490 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

PEB2256HT Datasheet(HTML) 65 Page - Infineon Technologies AG

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FALC56 V1.2
PEB 2256
Functional Description E1
Data Sheet
65
2002-08-27
Figure 16
Protection Switching Application
4.1.8
Loss-of-Signal Detection (E1)
There are different definitions for detecting Loss-Of-Signal (LOS) alarms in the ITU-T
G.775 and ETS 300233. The FALC56 covers all these standards. The LOS indication is
performed by generating an interrupt (if not masked) and activating a status bit.
Additionally a LOS status change interrupt is programmable by using register GCR.SCI.
• Detection:
An alarm is generated if the incoming data stream has no pulses (no transitions) for a
certain number (N) of consecutive pulse periods. “No pulse” in the digital receive
interface means a logical zero on pins RDIP/RDIN/ROID. A pulse with an amplitude
less than Q dB below nominal is the criteria for “no pulse” in the analog receive
interface (LIM1.DRS = 0). The receive signal level Q is programmable by three control
E1/T1/J1
Receive Line
FALC®
(active)
RL1
RL2
RDO
FALC®
(stand by)
RL1
RL2
RDO
XL1
XL2
E1/T1/J1
Transmit
Line
XDI
XL1
XL2
XDI
TRIST
TRIST
1
F0075



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