参数资料
型号: WJLXT386LEB2
厂商: INTEL CORP
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP100
封装: 14 X 14MM, ROHS COMPLIANT, LQFP-100
文件页数: 21/86页
文件大小: 1081K
代理商: WJLXT386LEB2
LXT386 — QUAD T1/E1/J1 Transceiver
28
Datasheet
3.3.1
Transmit Pulse Shaping
The transmitted pulse shape is internally generated using a high speed D/A converter. Shaped
pulses are further applied to the line driver for transmission onto the line at TTIP and TRING. The
line driver provides a constant low output impedance regardless of whether it is driving marks,
spaces or if it is in transition. This well controlled dynamic impedance provides excellent return
loss when used with external precision resistors (± 1% accuracy) in series with the transformer.
3.3.1.1
Hardware Mode
In hardware mode, pins LEN0-2 determine the pulse shaping as described in Table 2. The LEN
settings also determine whether the operating mode is T1 or E1. Note that in T1 operation mode, all
four ports will share the same pulse shaping setting. Independent pulse shaping for each channel is
available in host mode
3.3.1.2
Host Mode
In Host Mode, the contents of the Pulse Shaping Data Register (PSDAT) determines the shape of
pulse output at TTIP/TRING. Refer to Table 24 and Table 25.
.
Table 2.
Line Length Equalizer Inputs
LEN2
LEN1
LEN0
Line Length1
Cable Loss2
Operation Mode
011
0 - 133 ft. ABAM
133 - 266 ft. ABAM
266 - 399 ft. ABAM
399 - 533 ft. ABAM
533 - 655 ft. ABAM
0.6 dB
1.2 dB
1.8 dB
2.4 dB
3.0 dB
T1
100
101
110
111
0
E1 G.703, 75
Ω coaxial cable and 120 Ω twisted pair cable.
E1
1. Line length from LXT386 to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
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