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參數(shù)資料
| 型號： | LXT6155LE |
| 元件分類： | 通信、網(wǎng)絡模塊及開發(fā)工具 |
| 英文描述： | Telecomm/Datacomm |
| 中文描述： | 電信/數(shù)據(jù)通信 |
| 文件頁數(shù)： | 12/48頁 |
| 文件大?。?/td> | 1105K |
| 代理商： | LXT6155LE |
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Intel
LXT6155 155 Mbps SDH/SONET/ATM Transceiver
12
Datasheet
2.0
Functional Description
The Intel
LXT6155 is a front-end transceiver designed for 155 Mbps OC3/STM1/ATM
transmission applications.
Table 2
lists the standards with which the Intel
LXT6155 is compliant.
The Intel
LXT6155 interfaces to either a fiber transceiver or a coax cable on the line side, and on
the system side, to an SDH/SONET Overhead Terminator or an ATM UNI. The Intel
LXT6155
can function in Hardware stand-alone mode, or in Software mode controlled through an industry
standard Motorola compatible 4-wire serial microprocessor interface.
The Intel
LXT6155 can be set to operate in either CMI mode for the 75
coax interface or NRZ
mode for the optical transceiver interface. The operating mode can be set in either hardware mode
by using the MODE pin, or software mode by using Primary Control Register, bit 0.
2.1
Transmitter
In serial mode, the Intel
LXT6155 accepts both data (TPOS, TNEG) and clock signals (TSICLKP,
TSICLKN). Serial clock signals are required for the Intel
LXT6155 to run internal logic, reshape
the line transmit pulses and generate the low-jitter clocks for Tx data generation.
In parallel mode, the Intel
LXT6155 accepts data TPID<7:0> and clock TPICLK. TPICLK is
internally multiplied by 8 to yield the 155.52 MHz clock for Tx data generation.
Both serial and parallel clocks (TSICLKP/TSICLKN and TPICLK) must conform to the SONET/
SDH standard frequency accuracy requirements.
Depending on whether the selected media interface is coax or fiber, the data is CMI or NRZ
encoded respectively, and passed to the appropriate line drivers. The Intel
LXT6155 line drivers
are high-speed buffers that meet the CMI templates and industry standard LVPECL signal
requirements. The CMI output pins are TTIP0 and TRING0, and the NRZ LVPECL pins, TTIP1
and TRING1.
59
TAGND
S
Transmit Analog Ground
.
60
TRING0
AO
Transmit Output Data, positive (TTIP0) and negative
(TRING0)
. Differential CMI driver outputs for coax interface.
61
TTIP0
62
TRING1
DO
Transmit Output Data, positive (TTIP1) and negative
(TRING1)
. Differential LVPECL NRZ driver outputs for a fiber
optic transceiver.
63
TTIP1
64
TAVCC
S
Transmit Analog Power Supply
.
Table 1. Intel
LXT6155 Pin Descriptions (Continued)
Pin #
Symbol
I/O
1
Type
2
Description
1. DI = Digital Input; DO = Digital Output; DI/O = Digital Input/Output; AI = Analog Input; AO = Analog Output; AI/O = Analog
Input/Output; S=Supply.
2. TTL = Transistor-to-Transistor Logic (5 V tolerant); LVPECL = Low-Voltage positive ECL.
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