peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 149

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

Table 38
Alarm
Yellow Alarm
or
Remote Alarm
(RRA)
Excessive Zeros
(EXZD)
Pulse Density
Violation
(PDEN)
Transmit Line
Short
(XLS)
Transmit Ones
Density
(XLO)
RRA detection operates in the presence of 10
Data Sheet
Summary of Alarm Detection and Release (T1/J1) (cont’d)
Detection Condition
RC1.RRAM = 0:
bit 2 = 0 in 255 consecutive time
slots or
FS bit = 1 of frame12 in F12 (D4)
format or
8x1,8x0 in the DL channel (ESF )
RC1.RRAM = 1:
bit 2 = 0 in every time slot per
frame or
FS bit = 1 of frame12 in F12 (D4)
format or
8x1,8x0 in the DL channel (ESF )
more than 7 (B8ZS code) or
more than 15 (AMI code)
contiguous zeros
less than 23 ones received in a
floating time window of 192 bits
or
more than 15 consecutive zeros
(see
If XL1 and XL2 are shortened for
at least 32 pulses; pins XL1 and
XL2 are forced into a high
impedance state automatically, if
bit XPM2.DAXLT is reset.
32 consecutive zeros in the
transmit data stream on XL1/2
Chapter
5.5.9)
149
-3
bit error rate.
Clear Condition
RC1.RRAM = 0:
set conditions no longer
detected.
RC1.RRAM = 1:
bit 2 = 0 not detected in 3
consecutive frames or
FS bit not detected in 3
consecutive multiframes or
8x1,8x0 not detected for 3 times
in a row (ESF).
Latched Status: cleared on read
After 32 consecutive pulse
periods the outputs XL1/2 are
activated again and the internal
transmit current limiter is
checked. If a short between XL1/
2 is still existing, the outputs XL1/
2 are switched into high
impedance state again. When
the short disappears pins XL1/2
are activated automatically.
Cleared with each transmitted
pulse
Functional Description T1/J1
FALC-LH V1.3
PEB 2255
2000-07