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参数资料
| 型号： | LXT6251A |
| 英文描述： | ATM/SONET MAPPER|CMOS|QFP|208PIN|PLASTIC |
| 中文描述： | 的ATM / SONET的映射器|的CMOS | QFP封装| 208PIN |塑料 |
| 文件页数： | 17/76页 |
| 文件大小： | 995K |
| 代理商： | LXT6251A |
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21 E1 SDH Mapper
—
LXT6251A
Datasheet
17
3.2.1
Receive Alarms
There are two alarms associated with the Telecom bus interface.
3.2.1.1
Parity Alarm
The receive telecom bus data integrity is monitored with a single odd parity bit. The parity is
calculated over the DTBDATA bus only. The mapper checks the parity for errors every 500mS
multiframe and indicates an alarm in
“
GLOB_INTS
—
Global Interrupt Source (00CH)
”
on page 60
if there are more than 16 errors within the 500mS time window. The interrupt is maskable in
“
INT_CONF
—
Interrupt Configuration Register (00BH)
”
on page 59
.
3.2.1.2
Loss of Multiframe
A loss of multiframe alarm is detected if the DTBH4EN signal is always low. The alarm status and
interrupt is indicated in
“
GLOB_INTS
—
Global Interrupt Source (00CH)
”
on page 60
.
Consequent Actions:
An LOM alarm will cause the SF alarm bit on the SAP bus to be high for all 21 tributaries. The
SF alarm is used to indicate errors that should cause a VC path protection event. The SAP bus
is described in detail in
“
Serial/Remote Alarm Processing Port
”
on page 40
.
Figure 3. LXT6251A Block Diagram
FIFO
MTD<1:21>
Lower order Path
Adaption
DTD<1:21>
DTC<1:21>
DTBDATA<7:0>
MTBDATA<7:0>
MTBPAR
MTBPAYEN
MTBH4EN
Serial
Alarm
Processing
A<8:0>
DSAPCLK
DSPAFRM
S/P
LPA
MTC<1:21>
Lower order Path
Termination
VC-12
POH
LPT
Unequipped
Generator
TU Pointer
Generation
LUG
HPA
Desynchronizer
& FIFO
Lower order Path Adaption
P/S
LPA
Low order
Connection
Supervision
Higher order
Path Adaption
Lower order Path Termination
and Overhead Monitor
VC-12
POH
LPT/LPOM
TU Pointer
Processing
HPA
Higher order Path
Adaption
CS
WR/RW
RD/E
DSAPDATA
MTBTUGEN
DTBYCK
DTBJ0J1EN
DTBPAYEN
DTBTUGEN
DTBH4EN
DTBPAR
Remote
Alarm
Processing
MRAPCLK
MRAPFRM
MRAPDATA
DATA<7:0>
MCUTYPE
AS
INT
STMMODE
OEN
RST
MTBJ0J1EN
PTSOH
PTTUGA
PTTUGB
ADM
Control
Timing Control
Synchronous Equipment Management Function (SEMF) Interface
Alarm & Control Memory
MTBDOE
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