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参数资料
| 型号： | LXT6155LE |
| 元件分类： | 通信、网络模块及开发工具 |
| 英文描述： | Telecomm/Datacomm |
| 中文描述： | 电信/数据通信 |
| 文件页数： | 33/48页 |
| 文件大小： | 1105K |
| 代理商： | LXT6155LE |
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Intel
LXT6155 155 Mbps SDH/SONET/ATM Transceiver
Datasheet
33
4.0
Application Information
The following provides application examples of interfacing the Intel
LXT6155 to the line side and
the overhead terminator side. Line side encoding schemes can be one of two types: LVPECL NRZ
encoded for a fiber optic module, or CMI encoded for a 75
coax cable. On the systems side,
serial differential or parallel eight-bit modes can be used. All signals are TTL level compatible,
except serial interface signals (TPOS, TNEG, TSICLKP, TSICLKN, RSOCLKP, RSOCLKN,
RPOS, and RNEG) which are 3.3 V LVPECL compatible.
4.1
Fiber Optic Module Interface
The Intel
LXT6155 is designed to directly drive a 3.3 V LVPECL fiber optic transceiver. The
LVPECL drivers require the proper transmission line impedance to correctly drive the fiber
module. Signal traces should be 50
controlled impedance lines and should be biased to the
appropriate level. Please refer to
Figure 16
for the proper interface.
To interface the Intel
LXT6155 LVPECL signals to a 5 V PECL fiber optic module, please refer
to the Intel
LXT6155
155 Mbps SDH/SONET/ATM Transceiver Application Note
(Intel order
number 249280).
4.2
Coax Interface
As shown in Figure 17 on page 35, the Intel
LXT6155 directly drives a transformer connected to
a 75
coaxial cable, up to12.7 dB cable loss at 78 MHz. This is approximately 110 m of RG59U.
Please refer to manufacturers specifications for maximum cable lengths. Output CMI waveform
conform to the ITU G.703 specifications. Rise and fall times are less than 2.0 ns.
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