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參數(shù)資料
| 型號(hào)： | 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封裝| 208PIN |塑料 |
| 文件頁(yè)數(shù)： | 32/76頁(yè) |
| 文件大小： | 995K |
| 代理商： | LXT6251A |
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LXT6251A
—
21 E1 SDH Mapper
32
Datasheet
5.2.1.2
PTTUGx
The PTTUGA and PTTUGB pins are used only in STM-1 mode to control the pass through of the
other TUG-3 payloads not being processed by the device. The need for this function can arise if an
ADM site is configured to access data in only one TUG-3 payload, thereby requiring only one
LXT6251A. The LXT6251A will process the TUG-3 that corresponds with the TUG enable signal
connected to its input pin DTBTUGEN. The other two TUG-3 payloads can be passed through by
connecting the remaining two DTBTUGEN signals from the OHT to the PTTUGA and PTTUGB
pins. Whenever either of these pins is high, the data on the receive Telecom bus is passed through
to the transmit Telecom Bus. For example, if the ADM site contains two LXT6251A mappers
processing TUG-3 #1 and TUG-3 #3, then one of the mappers can be configured to pass through
the TUG-3 #2 payload by connecting the OHT DTBTUGEN2 signal to the PTTUGA pin and
connecting the DTTUGB pin to ground. The second mapper chip must have these two pins
connected to ground. The different configurations are shown schematically in Figure 6. The
functional timing diagram in Figure 9 provides examples of PTTUGA and PTTUGB.
5.2.2
MTBDATA Drive Enable
Table 6 on page 32
shows the drive of the MTBDATA bus in all configurations. The first column
gives the configuration, while the remaining four columns represent the four different data types
that can be output on this bus. For example, the STM-1 ADM multiplexer with PTSOH tied to
ground will drive the bus when MTBTUGEN is active, and will be in tri-state during the SOH,
HPOH (and two bytes of VC-3/VC-4 fixed stuff), and the other two TUG-3 payloads. It is
recommended that PTTUGA/B signals be active only on the device with PTSOH set high.
.
Table 6. Multiplex Telecom Bus Drive Matrix
Configuration
Section Overhead
POH and
VC Fixed Stuff
PTTUGA/B
= ‘1’
MTBTUGEN
= ‘1’
STM-1 ADM,
PTSOH =
‘
1
’
Data
Data
Data
Data
STM-1 ADM,
PTSOH =
‘
0
’
Hi-Z
Hi-Z
Hi-Z
Data
STM-1 Term
Hi-Z
Hi-Z
Hi-Z
Data
STM-0 ADM
Data
Data
N/A
Data
STM-0 Term
Data
Data
N/A
Data
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