参数资料
型号: XRT83VSH314IB
厂商: Exar Corporation
文件页数: 25/80页
文件大小: 0K
描述: IC LIU SH T1/E1/J1 14CH 304TBGA
标准包装: 27
类型: 线路接口装置(LIU)
驱动器/接收器数: 14/14
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 304-BBGA
供应商设备封装: 304-PBGA(31x31)
包装: 托盘
XRT83VSH314
28
REV. 1.0.1
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
4.5.1
ATAOS (Automatic Transmit All Ones)
If ATAOS is selected by programming the appropriate global register, an AMI all ones signal will be transmitted
for each channel that experiences an RLOS condition. If RLOS does not occur, the ATAOS will remain inactive
until an RLOS on a given channel occurs. A simplified block diagram of the ATAOS function is shown in
FIGURE 17. SIMPLIFIED BLOCK DIAGRAM OF THE ATAOS FUNCTION
4.5.2
QRSS/PRBS Generation
The XRT83VSH314 can transmit a QRSS/PRBS random sequence to a remote location from TTIP/TRING. To
select QRSS or PRBS, see the register map for programming details. The polynomial is shown in Table 9.
4.6
Transmit Pulse Shaper and Filter
If TCLK is not present, pulled "Low", or pulled "High" the transmitter outputs at TTIP/TRING will automatically
send an all ones or an all zero signal to the line by programming the appropriate global register. By default, the
transmitters will send all zeros. To send all ones, the TCLKCNL bit must be set "High".
4.6.1
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 10.
TABLE 9: RANDOM BIT SEQUENCE POLYNOMIALS
RANDOM PATTERN
T1
E1
QRSS
220 - 1
PRBS
215 - 1
TABLE 10: SHORT HAUL LINE BUILD OUT
LBO SETTING EQC[4:0]
RANGE OF CABLE ATTENUATION
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
RLOS
ATAOS
TAOS
TTIP
TRING
Tx
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