參數(shù)資料
型號: CN8333EXF
英文描述: PCM Transceiver
中文描述: 收發(fā)器的PCM
文件頁數(shù): 26/48頁
文件大?。?/td> 434K
代理商: CN8333EXF
2.0 Functional Description
CN8331/CN8332/CN8333
2.2 Transmitter
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
2-8
Conexant
100604B
2.2.5 Alarm Indication Signal (AIS) Generator
When selected by asserting TAIS, an AIS replaces the transmit data at TPOS and
TNEG. The E3 type of AIS signal (all 1s) is supported. In three-level signal form,
this is a continuously alternating positive and negative pulse stream, as if the
transmit data were a continuous string of logical 1s.
Figure 2-6
illustrates the AIS
signal.
The TAIS pin has the same data latency as the TX data pins and can be used to
replace single symbols within a data stream. When the encoder is disabled
(ENDECDIS = 1), the TAIS mode maintains the proper phase, based upon the
polarity of the last 1 received.
The AIS signal follows the same path as the TX data during remote or local
loopback.
2.2.6 Jitter Generation (Intrinsic)
The CN833x device meets the jitter generation requirements for various rates
with large margins, with the condition that the input transmit clock (TCLK) is
jitter-free. Data rates and jitter generation requirements are defined in the
following documents:
E3 rate
ETSI TBR24
,
ITU-T 9.823
DS3 rate
Bellcore Telecardia GR499
,
AT&T Accunet TR54014,
ITU-T 9.824
STS-1 rate
Bellcore
Telecardia
GR253
Figure 2-6. AIS Signal
POSITIVE
PULSE
NEGATIVE
PULSE
TLINEP
(output voltage)
TLINEM
(output voltage)
8333_009
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