PEF2256 INFINEON [Infineon Technologies AG], PEF2256 Datasheet - Page 69

• Manufacturer Part Number: PEF2256
• Description: E1/T1/J1 Framer and Line Interface Component for Long- and Short-Haul Applications
• Manufacturer: INFINEON [Infineon Technologies AG]

Figure 19
4.1.9
There are different definitions for detecting Loss-Of-Signal (LOS) alarms in the ITU-T
G.775 and ETS 300233. The FALC
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.
•
User’s Manual
Hardware Description
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
E1/T1/J1
Transmit
E1/T1/J1
Receive
Line
Line
Loss-of-Signal Detection (E1)
Long Haul Protection Switching Application (E1)
®
56 covers all these standards. The LOS indication
69
XL1
XL2
RL1
RL2
XL1
XL2
RL1
RL2
stand-by device
active device
Functional Description E1
DS1.1, 2003-10-23
RDO
RDO
PEF 2256 H/E
XDI
XDI
F56V2_Receiver_3
FALC
®
56