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  • what is it TTL which shows on ping report and the value its showing . . .
    If the TTL value started at, say, 128 and you see a value of 28, then there were 100 hops between the system where the packet originated and the final destination My guess is that the initial TTL for the ping packets was 255, so the first ping traversal took 200 hops and the second took 9
  • Does TTL need to be set to 3600 for MX record? - Microsoft Community
    But the domain is still not getting verified I've hit the refresh button on the 'Domain Settings' page too but to no avail The only issue I'm having is that my domain host does not allow TTL values less than 14400 (4 hours) Thus I'm unable to set the TTL value specified in the instructions on the 'Domain Settings' page - 3600
  • digital logic - What is meant by TTL in this context? - Electrical . . .
    Additionally, a user might think that a high signal means "100%", and that a low signal means "0% " Depending on the specific TTL driver, this is not true because of the effective voltages The Chapter "CHANGE THE ANALOG INPUT MODULATION TRANSFER FUNCTION" on page 15 of the linked data sheet shows an example control circuit
  • USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and . . .
    Often any 5V logic is called TTL, although most circuits nowadays are built as CMOS Today there are also many circuits that work at 3 3V, which is no longer TTL With respect to the internal levels the levels on the RS-232 line are inverted, +12V corresponds to logical low and -12V corresponds to logical high, which can be confusing
  • ttl - 10k Resistor Pull Up Down Standard for 74 series chips . . .
    In TTL 74LS serie, a input signal between 0 and 0 8V is considered “LOW”, and a input signal between 2 0 and 5 0V is considered “HIGH” Any voltage between 0 8 and 2 0 volts is undefined Therefore, you have to guarantee in your design that you will never enter in the uncertainty zone Pull-up Resistor Value
  • rs232 - What is the difference between RS-232 and TTL UART . . .
    A TTL UART will output (and input) only TTL levels, essentially 0 bit = 0V and 1 bit = 5V And many modern-day gadgets (Arduino, et al ) simply use TTL voltage levels for serial communication But the "proper" definition of RS-232 used a rather HIGHER and BIPOLAR voltages to define zero and one
  • microcontroller - How does TTL serial work? - Electrical Engineering . . .
    Which would be different if it were really TTL, as in your question (the microcontroller is HCMOS) TTL outputs are highly asymmetrical: they can only supply little current, typically 0 4mA Sinking current is OK, at 8mA The low source current may be a problem if the line has a high capacitance and is high speed
  • arduino - What is difference between USB and TTL? - Electrical . . .
    The "TTL" on an Arduino board means that the signals are 5 V There is no TTL logic on an Arduino board at all The ATMega chip on the Arduino can work at 3 3 V to 5 5 V so that includes TTL level signals Many serial ports use TTL level (5 V) signals and you should not connect those directly to an ATMega chip unless it also runs on 5 V
  • Is an LVTTL output fully compatible to a TTL output?
    TTL outputs must be able to sink 16 mA with a voltage drop of no more than 0 4 V, and to source 0 4 mA while staying above 2 4 V (TTL inputs source 1 6 mA, so this is designed for a fanout of 10 ) LVTTL outputs, as specified in JEDEC standard No 8C 01, must be able to sink or source 2 mA at the same voltages
  • TTL在ping命令中代表什么？ - 知乎
    TTL（Time To Live）：数据包的存活周期，每经过一个三层设备减1，包括三层交换机，直到TTL为零时抛弃数据包，目的：防环路。默认值：Windows 128（Windows 10 后的版本）、UNIX 255、Linux 64 或 255。





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