參數(shù)資料
型號: 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): 55/153頁
文件大小: 1316K
代理商: XRT86VL3X
XRT86VL3X
48
REV. 1.2.2
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
5.1.4
Network Loop Down Code
By setting the LIU to generate a NLDC, the transmitters will send out a repeating "001" pattern. The output
waveform is shown in
Figure 49
.
5.1.5
QRSS Generation
The XRT86VL3x can transmit a QRSS random sequence to a remote location from TTIP/TRING. The
polynomial is shown in
Table 3
.
5.2
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 50
, a
pulse with -15dB attenuation is shown in
Figure 51
, and a pulse with -22.5dB attenuation is shown in
Figure 52
.
F
IGURE
48. N
ETWORK
L
OOP
U
P
C
ODE
G
ENERATION
F
IGURE
49. N
ETWORK
L
OOP
D
OWN
C
ODE
G
ENERATION
T
ABLE
3: R
ANDOM
B
IT
S
EQUENCE
P
OLYNOMIALS
R
ANDOM
P
ATTERN
T1
E1
QRSS/PRBS
2
20
- 1
2
15
- 1
Network
Loop-Up
Code
1
1
0
0
0
0
0
0
0
0
1
Network
Loop-Down
Code
1
1
1
1
0
0
0
0
0
0
0
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