James-san, Thanks for reply.
I reported to customer. Bestregards, 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. > _______________________________________________ networking-discuss mailing list [email protected]
