PEB2256E INFINEON [Infineon Technologies AG], PEB2256E Datasheet - Page 91

• Manufacturer Part Number: PEB2256E
• Description: E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications
• Manufacturer: INFINEON [Infineon Technologies AG]

Table 20
Alarm
Remote Alarm in
time slot 16 (TS16RA)
Loss-of-Signal in
time slot 16
(TS16LOS)
Alarm Indication
Signal in time slot 16
(TS16AIS)
Transmit Line Short
(XLS)
Transmit Ones-
Density
(XLO)
4.3.2
• Automatic remote alarm access
• Automatic E-bit access
• Automatic AIS to system interface
• Automatic clock source switching
• Automatic freeze signaling:
Data Sheet
If the receiver has lost its synchronization a remote alarm can be sent automatically,
if enabled by bit FMR2.AXRA to the distant end. The remote alarm bit is set
automatically in the outgoing data stream, if the receiver is in asynchronous state
(FRS0.LFA bit is set). In synchronous state the remote alarm bit is removed.
By setting bit XSP.AXS status information of received submultiframes is automatically
inserted at the E-bit position of the outgoing CRC Multiframe without any further
interventions of the microprocessor.
In asynchronous state the synchronizer enforces an AIS to the receive system
interface automatically. However, received data can be switched through
transparently, if bit FMR2.DAIS is set.
In slave mode (LIM0.MAS = 0) the DCO-R synchronizes to the recovered route clock.
In case of loss-of-signal (LOS) the DCO-R switches to Master mode automatically. If
bit CMR1.DCS is set, automatic switching from RCLK to SYNC is disabled.
Updating of the received signaling information is controlled by the freeze signaling
status. The freeze signaling status is automatically activated if a loss-of-signal or a
Auto Modes
Summary of Alarm Detection and Release (E1) (cont’d)
Detection Condition
Y-bit = 1 received in CAS
multiframe alignment word
all zeros for at least 16
consecutively received time
slots 16
time slot 16 containing less
than 4 zeros in each of two
consecutive CAS
multiframes periods
more than 3 pulse periods
with highly increased
transmit line current on
XL1/2
32 consecutive zeros in the
transmit data stream on
XL1/2
91
Clear Condition
Y-bit = 0 received in CAS
multiframe alignment word
receiving a one in
time slot 16
time slot 16 containing more than
3 zeros in one CAS multiframe
transmit line current limiter
inactive
Cleared with each transmitted
pulse
Functional Description E1
FALC56 V1.2
PEB 2256
2002-08-27