參數(shù)資料
型號(hào)： LXT350PE
英文描述： PCM TRANSCEIVER|SINGLE|CEPT PCM-30/E-1|CMOS|LDCC|28PIN|PLASTIC
中文描述： 的PCM收發(fā)器|單|優(yōu)稅PCM-30/E-1 |的CMOS | LDCC | 28腳|塑料
文件頁(yè)數(shù)： 23/50頁(yè)
文件大小： 1197K
代理商： LXT350PE
T1/E1 Short Haul Transceiver with Crystal-less Jitter Attenuation
—
LXT350
Datasheet
23
2.7.1.4
Dual Loopback
(DLOOP)
See
Figure 9
. In Hardware mode, DLOOP is selected by setting both the RLOOP and LLOOP pins
High. In Host mode set bits CR2.ERLOOP = 1 and CR2.ELLOOP = 1. In DLOOP mode, the
transmit clock and data inputs (TCLK and TPOS/TNEG or TDATA) loop back through the Jitter
Attenuator (unless disabled) to RCLK and RPOS/RNEG or RDATA. The data and clock recovered
from the twisted-pair line loop back through the transmit circuits to TTIP and TRING without jitter
attenuation.
2.7.2
Internal Pattern Generation
2.7.2.1
Transmit All Ones
(TAOS)
See
Figure 10
. When TAOS is active, the transceiver ignores the TPOS and TNEG inputs and
transmits a continuous stream of 1
’
s at the TCLK frequency. When TCLK is not supplied, TAOS
timing is derived from MCLK. This can be used as the Alarm Indication Signal (AIS
–
also called
the Blue Alarm).
Both TAOS and LLOOP can operate simultaneously as shown in
Figure 5
, however, RLOOP
inhibits TAOS. When both TAOS and LLOOP are active, TCLK and TPOS/TNEG loop back to
RCLK and RPOS/RNEG (through the jitter attenuator if enabled), and the all ones pattern is also
routed to TTIP/TRING.
In Host mode, TAOS is activated when bit CR2.ETAOS = 1. In Hardware mode, setting the TAOS
pin High activates TAOS.
2.7.2.2
Quasi-Random Signal Source
(QRSS)
See
Figure 11
. For T1 operation, the Quasi-Random Signal Source (QRSS) is a 2
20
-1 pseudo-
random bit sequence (PRBS) with no more than 14 consecutive zeros. For E1 operation, QRSS is
2
15
-1 PRBS with inverted output.
Figure 9. Dual Loopback
Figure 10. TAOS Data Path
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LXT350QE 制造商:LEVEL1 功能描述:
LXT351 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:T1/E1 Short Haul Transceiver with Crystal-less Jitter Attenuation
LXT351PE 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:PCM TRANSCEIVER|SINGLE|CEPT PCM-30/E-1|CMOS|LDCC|28PIN|PLASTIC
LXT351QE 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:PCM TRANSCEIVER|SINGLE|CEPT PCM-30/E-1|CMOS|QFP|44PIN|PLASTIC
LXT360 制造商:LVL1 制造商全稱(chēng):LVL1 功能描述:Integrated T1/E1 LH/SH Transceivers for DS1/DSX-1/CSU or NTU/ISDN PRI Applications
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