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| 型號： | XRT83SH314_0610 |
| 廠商： | Exar Corporation |
| 英文描述： | 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT |
| 中文描述： | 14-CHANNEL的T1/E1/J1短途線路接口單元 |
| 文件頁數(shù)： | 33/101頁 |
| 文件大小： | 656K |
| 代理商： | XRT83SH314_0610 |
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XRT83SH314
29
REV. 1.0.4
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
3.6.1
T1 Short Haul Line Build Out (LBO)
The short haul transmitter output pulses are generated using a 7-Bit internal DAC (6-Bit plus the MSB sign bit).
The line build out can be set to interface to five different ranges of cable attenuation by programming the
appropriate channel register. The pulse shape is divided into eight discrete time segments which are set to
fixed values to comply with the pulse template. The short haul LBO settings are shown in
Table 11
.
3.6.2
Arbitrary Pulse Generator For T1 and E1
The arbitrary pulse generator divides the pulse into eight individual segments. Each segment is set by a 7-Bit
binary word by programming the appropriate channel register. This allows the system designer to set the
overshoot, amplitude, and undershoot for a unique line build out. The MSB (bit 7) is a sign-bit. If the sign-bit is
set to "0", the segment will move in a positive direction relative to a flat line (zero) condition. If this sign-bit is
set to "1", the segment will move in a negative direction relative to a flat line condition. The resolution of the
DAC is typically 60mV per LSB. Thus, writing 7-bit = 1111111 will clamp the output at either voltage rail
corresponding to a maximum amplitude. A pulse with numbered segments is shown in
Figure 20
.
F
IGURE
20. A
RBITRARY
P
ULSE
S
EGMENT
A
SSIGNMENT
N
OTE
:
By default, the arbitrary segments are programmed to 0x00h. The transmitter outputs will result in an all zero
pattern to the line interface.
T
ABLE
11: S
HORT
H
AUL
L
INE
B
UILD
O
UT
LBO
SETTING
EQC[4:0]
R
ANGE
OF
C
ABLE
A
TTENUATION
08h (01000)
0 - 133 Feet
09h (01001)
133 - 266 Feet
0Ah (01010)
266 - 399 Feet
0Bh (01011)
399 - 533 Feet
0Ch (01100)
533 - 655 Feet
1
2
3
4
5
6
7
8
Segment
Register
1
2
3
4
5
6
7
8
0xn8
0xn9
0xna
0xnb
0xnc
0xnd
0xne
0xnf
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| XRT83SH314ES | 功能描述:外圍驅(qū)動器與原件 - PCI 14 CHT1/E1LIU SH RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT83SH314IB | 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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| XRT83SH314IB-SAK | 制造商:Exar Corporation 功能描述:14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT 制造商:EXAR 功能描述:14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT |
| XRT83SH38 | 制造商:EXAR 制造商全稱:EXAR 功能描述:8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT |
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