James-san,
Thanks for reply.
I got additional question from CU.
Please give us your opinion if you know about it.
Q1. Could you tell us how time until port is opened is decided?
Does it depend on TA or hardware on server?
Q2. They want to issue TA command after port is actually opened,
but is there any way to do it via script like chat script?
Best regards,
Yozo Nitta
James Carlson wrote:
>Yozo Nitta writes:
>
>
>>They found description about TA CU use as following:
>>
>>
>
>TA == Terminal Adapter (for ISDN)
>CU == Customer (?)
>
>
>
>> - Communication is enabled via PC "ER signal on".
>>
>>
>
>I _think_ "ER signal" is DTR. I used to work in ISDN, and I don't
>recall "ER signal" being a common term.
>
>
>
>>They confirmed TA doesn't work unless Sun server
>>is in condition which enables to receive data.
>>
>>Considering above, please answer questions following:
>>
>>Q1. Is a signal "ER signal on" sent when PPP daemon is started?
>>
>>
>
>DTR is asserted on the serial port when *any* process opens the device
>node (e.g., /dev/cua/a). That includes the PPP daemon (pppd), so when
>pppd opens the port DTR is asserted.
>
>It's not specific to PPP.
>
>
>
>>Q2. Is "ER signal on" sent before script is run?
>>
>>
>
>Same as Q1: DTR is set when the port is opened, which is before a
>"connect" script is run. (I'm assuming you're talking about "connect"
>-- pppd has many different scripts.)
>
>
>
>>Q3. Is there timing "ER signal on" is issued?
>> e.g in xxx seconds after pppd is run
>>
>>
>
>It's as soon as pppd opens the port, which (by default) is
>immediately.
>
>If you use the "demand" option, then pppd won't try to open the port
>until there's traffic on the network interface.
>
>
>
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