peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 104
peb2255
Manufacturer Part Number
peb2255
Description
E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB2255.pdf
(374 pages)
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optical interface with NRZ coding, the decoder is by-passed and no code violations are
detected.
Additionally, the receive line interface contains the alarm detection for Alarm Indication
Signal AIS (Blue Alarm) and the Loss of Signal LOS (Red Alarm).
Pulse density violations are detected and indicated via bit FRS1.PDEN.
The signal at the ternary interface is received at both ends of a transformer.
Figure 32
•
Table 22
Parameter
R
t
5.1.5
There are different definitions for detecting Loss of Signal alarms (LOS) in the ITU-T
G.775 and AT&T TR 54016. The FALC
indication is performed by generating an interrupt (if not masked) and activating a status
bit. Additionally a LOS status change interrupt is programmable via register IPC.SCI.
• Detection:
Data Sheet
2
2
: t
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). In short haul mode (LIM0.EQON = 0), the receive signal level
Q is programmable via three control bits LIM1.RIL2...0 in a range of about 1400 to 200
mV differential voltage between pins RL1/2 (see
( 1 %) [ ]
1
Loss of Signal Detection (T1/J1)
Receiver Configuration (T1/J1)
Recommended Receiver Configuration Values (T1/J1)
Line
t
2
t
1
104
®
-LH covers all these standards. The LOS
R
2
Chapter 11.3
Characteristic Impedance
1 :
100
RL1
RL2
200
T1
Functional Description T1/J1
FALC
2
R
ITS10967
on page 357). In long
FALC-LH V1.3
1 :
110
220
PEB 2255
J1
2
2000-07
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