Zhone Technologies 900 - Manual (Page 53)

Data Cards IMACS System Release 5.1.6 1-41
HSU Card HSU Card User Screens and Settings
1.3.8.1 Basic HSU Dialing
Any port on any model HSU card can load a call profile into its dialing memory. Once a call
profile is loaded, the HSU port can be set to initiate dialing (using the currently loaded call
profile information) whenever it senses a raised DTR (Data Terminal Ready) lead from the
attached DTE device. Since this DTR lead can have only two values (low-don’t dial, and
high-go ahead and dial), any call must use the currently-loaded call profile. If the user wants
an HSU port to dial a different call profile when DTR goes high, the user must first use the
Dial menu to load a different call profile into the HSU port’s dialing memory.
1.3.8.2 RS366 and V.25bis HSU Dialing
As described in the previous paragraph, all models of HSU cards can initiate dialing when they
sense DTR high, but must use the currently-loaded call profile information to dial.
The HSU 8213 card switched services provides two methods for the DTE to dynamically
signal an HSU port to cause it to load a new call profile or to permanently modify the
currently-loaded call profile information.
One method uses the RS366 dialing port that is associated with the HSU data port to accept
RS366 dialing commands form the DTE. The other method provides dialing commands over
the data port using the V.25bis protocol. In both cases, the DTE can command the HSU port
to load a call profile into the HSU’s dialing memory, then can command the HSU to modify
some of the call profile information (e.g. data rate of the call or phone number to dial).
1.3.9 Master Dialing
As described in the previous paragraphs, call profile information can be changed by the DTE
prior to making a call only by using RS366 or V.25bis commands. Normally this would limit
dynamic DTE dialing to ports on the Model 8213 switched services HSU card. However, there
is a way for the DTE to indicate to the system that it wants to do dynamic dialing for an HSU
port other than itself.
This type of dialing is called “master” dialing. With master dialing, the DTE will signal the
Model 821360 HSU master port (via RS366 or V.25bis) that the following commands should
be applied to another HSu port, not to itself. Once the master HSU port receives the command
that says “apply all subsequent commands received on this dialing port to a different HSU
port,” the master port will process dialing information for another HSU port until it receives
a command that says, “apply all subsequent commands to yourself.”
A detailed description of both RS366 and V.25bis dialing command structures are provided on
the following pages.