參數(shù)資料
型號(hào)： XRT86VL3X
廠商： Exar Corporation
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù)： 54/149頁
文件大?。?/td> 1274K
代理商： XRT86VL3X
XRT86VL3X
47
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
REV. 1.2.0
4.3
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. To program the eight segments individually to optimize a
special line build out, see the arbitrary pulse section of this datasheet. The short haul LBO settings are shown
in
Table 4
4.3.1
Arbitrary Pulse Generator
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 49
.
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
4: 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
F
IGURE
49. A
RBITRARY
P
ULSE
S
EGMENT
A
SSIGNMENT
1
2
3
4
5
6
7
8
Segment
Register
1
2
3
4
5
6
7
8
0x0Fn8
0x0Fn9
0x0Fna
0x0Fnb
0x0Fnc
0x0Fnd
0x0Fne
0x0Fnf
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