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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)： | 29/50頁(yè) |
| 文件大?。?/td> | 1197K |
| 代理商： | LXT350PE |
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T1/E1 Short Haul Transceiver with Crystal-less Jitter Attenuation
—
LXT350
Datasheet
29
Table 9. Control Register #1
Read/Write, Address (A7-A0) = x010000x
Bit
Name
Function
Jitter Attenuator
JASEL0
JASEL1
Position
0
EC1
Sets mode (T1 or E1) and equalizer
(see
Table 10
below for control codes).
1
0
Transmit
1
EC2
1
1
Receive
2
EC3
0
X
Disabled
3
-
Reserved, set this bit to 0, ignore when reading.
4
UNIENB
1 = Enable Unipolar I/O mode and allow insertion/detection of BPVs.
0 = Enable Bipolar I/O mode
5
ENCEN
B
1 = Enable B8ZS/HDB3 encoders/decoders and force Unipolar I/O
mode.
0 = Disable B8ZS/HDB3 encoders/decoders
6
JASEL0
Select jitter attenuation circuitry position in data path or disables the
JA. See right hand section of table for codes.
7
JASEL1
Table 10. Equalizer Control Input Settings
EC3
EC2
EC1
Function
Pulse
Cable
Coding
1
0
0
0
E1
ITU Rec G.703
75
Coax/120
TP
HDB3
0
1
1
T1
0-133 ft / 0.6 dB
100
TP
B8ZS
1
0
0
T1
133-266 ft / 1.2 dB
100
TP
B8ZS
1
0
1
T1
266-399 ft / 1.8 dB
100
TP
B8ZS
1
1
0
T1
399-533 ft / 2.4 dB
100
TP
B8ZS
1
1
1
T1
533-655 ft / 3.0 dB
100
TP
B8ZS
1. When enabled.
Table 11. Control Register #2
Read/Write, Address (A7-A0) = x010001x
Bit
Name
Function
Pattern
EPAT0
EPAT1
Selected
0
ERLOOP
1
1 = Enable Remote loopback mode
0 = Disable Remote loopback mode
0
0
Transmit TPOS/TNEG
1
ELLOOP
1
1 = Enable Local loopback mode
0 = Disable Local loopback mode
0
1
Detect and transmit QRSS
2
EALOOP
1 = Enable Analog loopback mode
0 = Disable Analog loopback mode
1
0
In-band Loop Up Code
00001
3
-
Reserved, set to 0, ignore when reading.
1
1
In-band Loop Down Code
001
1. To enable Dual loopback (DLOOP), set both ERLOOP = 1 and ELLOOP = 1.
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