參數(shù)資料
型號(hào): XRT83L314IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA304
封裝: TBGA-304
文件頁(yè)數(shù): 34/84頁(yè)
文件大?。?/td> 631K
代理商: XRT83L314IB
XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
30
3.5.4
The XRT83L314 can transmit a QRSS random sequence to a remote location from TTIP/TRING. The
polynomial is shown in Table 11.
QRSS Generation
3.6
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".
3.6.1
T1 Long Haul Line Build Out (LBO)
The long haul transmitter output pulses are generated using a 7-Bit internal DAC (6-Bits plus the MSB sign bit).
The line build out can be set to -7.5dB, -15dB, or -22dB cable attenuation by programming the appropriate
channel register. The long haul LBO consist of 32 discrete time segments extending over four consecutive
periods of TCLK. As the LBO attenuation is increased, the pulse amplitude is reduced so that the waveform
complies with ANSI T1.403 specifications. A long haul pulse with -7.5dB attenuation is shown in Figure 26, a
pulse with -15dB attenuation is shown in Figure 27, and a pulse with -22.5dB attenuation is shown in
Figure 28.
F
IGURE
26. L
ONG
H
AUL
L
INE
B
UILD
O
UT
WITH
-7.5
D
B A
TTENUATION
Transmit Pulse Shaper and Filter
T
ABLE
11: R
ANDOM
B
IT
S
EQUENCE
P
OLYNOMIALS
R
ANDOM
P
ATTERN
T1
E1
QRSS
2
20
- 1
2
15
- 1
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