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參數(shù)資料
| 型號(hào)： | CN8333EXF |
| 英文描述： | PCM Transceiver |
| 中文描述： | 收發(fā)器的PCM |
| 文件頁(yè)數(shù)： | 15/48頁(yè) |
| 文件大?。?/td> | 434K |
| 代理商： | CN8333EXF |
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CN8331/CN8332/CN8333
1.0 Pin Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.1 Pin Assignments
100604B
Conexant
1-7
Control Signals
59
59
59
ENDECDIS
Encoder/decoder
disable (for all
channels)
I
1 = Dual rail pulse coded data format. Input
transmit data pins TPOS, TNRZ, TNEG and
NC are interpreted as TPOS and TNEG
(encoded positive and negative rail data).
Output receive data pins RPOS and RNRZ,
and RNEG and RLCV are interpreted as
RPOS and RNEG, with RPOS having a
positive pulse in place of every positive AMI
pulse and RNEG having a negative pulse in
place of every negative AMI pulse.
0 = NRZ format. Transmit data pins TPOS
and TNEG are interpreted as TNRZ and NC
(not connected). Receive data pins RPOS
and RNEG are interpreted as RNRZ and
RLCV. In this mode, all line code violations
are reported as active high on RLCV.
—
61
61
TAIS1
Transmit Ch1 AIS mode
enable
I
Transmission of Alarm Indication Signal
(AIS) for a given channel. Replace transmit
data with AIS signal. The AMI form of AIS
supported is alternating 1s.
(+1, -1, +1, -1, +1, ...)
Looping takes precedence over AIS.
1 = AIS mode enabled
0 = AIS mode disabled
51
—
51
TAIS/
TAIS2
Transmit Ch2 AIS mode
enable
I
40
40
40
TAIS2/
TAIS3
Transmit Ch3 AIS mode
enable
I
43
43
43
E3MODE
E3MODE
I
When the pin is set to high, it enables the
E3 mode on all channels, instead of the
DS3/STS-1 mode. This also changes the
pulse shaper to E3 mode and overrides all
LBO pins. It also changes the
encoder/decoder from B3ZS mode to HDB3
mode.
1 = E3 mode
0 = DS3/STS-1 mode
44
72
72
LBO/
LBO1
Transmit line Ch1
build-out mode
I
Line build-out mode per channel, based on
the length of cable on the transmit side of
the cross-connect block. This bit is
overridden and the pulse shaper is disabled
(no pulse shaping) if E3MODE =1.
1 = Inserts line build-out into the transmit
channel. Usually used when the transmit
cable is less than 350 feet in length.
0 = Line build-out bypassed (not inserted).
Usually used when the transmit cable is
greater than 350 feet in length.
—
29
44
LBO2
Transmit line Ch2
build-out mode
I
—
—
29
LBO3
Transmit line Ch3
build-out mode
I
Table 1-1. CN8331/CN8332/CN8333 Pin Definitions
(3 of 6)
Pin #
Signal Name
Description
I/O/P
Notes
CN8331
CN8332
CN8333
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