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參數(shù)資料
| 型號： | 78P2241B-IH |
| 英文描述： | Single 2.3V 10 MHz OP w/ CS, I temp, -40C to +85C, 8-TSSOP, TUBE |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大?。?/td> | 294K |
| 代理商： | 78P2241B-IH |
78P2241B
E3/DS3/STS-1
Transceiver
3
Functional Description
(continued)
The decoder also detects Receive Line Code
Violations (RLCV) and outputs a pulse via the
RNEG/RLCV pin. Three different classes of line code
violations are detected.
1) Too many zeros: More than two (three)
consecutive zeros in B3ZS (HDB3) mode.
2) Not enough zeros between bipolar pulse (B) and
bipolar violation pulse (V): (B,V) for B3ZS, (B,V)
or (B,0,V) for HDB3.
3) Code violation: Even number of bipolar pulses
(B) detected between bipolar violation pulses (V).
On the transmit side, NRZ input data is internally
converted to Positive and Negative logic data
following the B3ZS (for DS3/STS-1) or HDB3 (for E3)
substitution codes. The NRZ data is input to the
TPOS/TNRZ pin as shown below.
Pin 20
ENDEC
High
Low
TPOS/TNRZ
Positive AMI
NRZ data
TNEG
Negative AMI
LCV
LOSS OF SIGNAL
Should the input signal fall below a minimum value for
175 +/- 75 cycles of the receive clock RCLK, the loss
of signal indication,
LOS
goes low.
LOS
goes high
when a valid signal is received at the input for at least
175 +/- 75 cycles of the receive clock.
TRANSMITTER
The transmitter accepts logic level clock (TCLK),
positive data (TPOS) and negative data (TNEG)
signals and generates current pulses on the LOUT+
and LOUT- pins. When properly connected to a
center-tapped 1:2 transformer, an AMI pulse is
generated which can drive a 75
coaxial cable.
When the recommended transformer is used and the
E#
pin is set high, the transmitted pulse shape at the
end of the 75
terminated cable of 0 to 450 feet will
fit the DS3 template in ANSI T1.102-1993 and
Telcordia GR-499-CORE standard documents.
For STS-1 applications, the transmitted pulse for a
short cable meets the requirements of Telcordia
GR-253-CORE. The
E#
pin should be allowed to
float.
For E3 applications, the transmitted pulse for a short
cable meets the requirements of ITU-T G.703. The
E#
pin is to be pulled low.
RCLK/TCLK polarity reversal:
To simplify the interface with framer circuitry, RCLK
and TCLK can be inverted with the ICKP pin.
Pin 10
ICKP
Low
Normal
Float
Invert
High
Normal
Loop-back modes:
The following loop-back modes allow for the
diagnostic test of the PC board. This function is
controlled by the
LPBK
pin.
Pin 28
LPBK
Low
Local loop-back (LLB)
Float
Remote loop-back (RLB)
High
Normal Operation
RCLK
TCLK
Normal
Invert
Invert
Loop-back
Local loop-back
:
When
LPBK
is low, the 78P2241B enters Local
loopback. In this mode, the LOUT+/- transmit signals
are internally routed to the receiver input circuit. The
incoming line receiver AMI signal on LIN+/- is
ignored. With the transmitter still tied to the cable,
this test mode can indicate a short circuit on the
transmitter external components or other problem in
the transmit path.
Remote loop-back:
When
LPBK pin
is allowed to float, the 78P2241B
enters remote loopback mode. The RPOS/RNEG
and RCLK pins are internally tied to the
TPOS/TNEG and TCLK so the same AMI signal that
is received by the framer is transmitted back to the
far end where a bit continuity test can be performed.
Line Build-Out:
The Line Build-Out function controls the amplitude in
DS3 and STS-1 mode. The selection of LBO
depends on the amount of cable the transmitter is
connected to. When used with less than 225 ft of
cable the LBO pin should be pulled high. With 225ft
or more cable the LBO pin should be low.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 78P2243 | Single 2.3V 10 MHz OP, -40C to +125C, 8-TSSOP, T/R |
| 78P2244 | Single 2.3V 10 MHz OP w/ CS, I temp, -40C to +85C, 8-SOIC 150mil, T/R |
| 78P2252 | Single 2.3V 10 MHZ OP, -40C to +125C, 14-PDIP, TUBE |
| 78P2252-IGT | Single 2.3V 10 MHZ OP, -40C to +125C, 14-TSSOP, TUBE |
| 78P2253 | Quad 2.3V 10 MHz OP, I temp, -40C to +85C, 14-SOIC 150mil, TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 78P2241B-IH/F | 制造商:Maxim Integrated Products 功能描述:MAXIM 78P2241B-IH/F LINE INTERFACE UNITS - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Maxim 78P2241B-IH/F Line Interface Units |
| 78P2241B-IHR/F | 制造商:Maxim Integrated Products 功能描述:DS3/E3/STS-1 LIU-LINE CDE VIO. DET. - Tape and Reel |
| 78P2241-IGT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transceiver |
| 78P2241-IH | 制造商:TDK 功能描述:TRANSCEIVER, 28 Pin Plastic PLCC |
| 78P2243 | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:Triple E3/DS3/STS-1 Transceiver |
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