Zhone Technologies 900 - Manual (Page 59)

Data Cards IMACS System Release 5.1.6 1-47
HSU Card HSU Card User Screens and Settings
1.3.16 V.25bis Dialing
The 821360 HSU card also recognizes V.25bis commands, as in-band protocol for dialing by
DTE equipment. V.25bis defines two modes, Addressed and Direct. The Direct call mode is
enabled by selecting dtr as the dial trigger from the Dial Screen on the HSU card. The
Addressed call mode is enabled by selecting v.25b as the dial trigger. Reference to V.25bis will
be for the Addressed mode only. Refers to dtr dialing will be for the Direct mode and can be
found in the HSU section. This method allows the use of control signals and commands sent
over the HSU Card data interface to establish and terminate calls. Addressed calls are
packaged in synchronous data frames and are sent when the interface is idle.
CRN commands can alter existing call profiles loaded to the HSU card with new telephone
numbers and bandwidth without having to access the call profile through the HSu card screen.
CRS commands can load call profiles form the Interface card without having to use the Load
command form the HSU card screen.
New call profiles and changes made to existing call profiles are permanent and will remain
with the card until changed by any of the procedures discussed in this chapter.
1.3.17 The CRN Command
The Call Request with Number command is sent form the DTE to the HSU card to request a
particular number to be dialed. The DTE may include parameters setting the call type, rate
bandwidth range, etc.
Other than the new phone number, type and bandwidth, the CRN command uses the data form
the currently loaded HSU call profile.
1.3.18 The SCT Parameter
The Switched Call Type parameter to the CRN command selects the type of call made. Call
types define the data rate of a single channel, the type of carrier service for the call and indicate
if multiple channels can be aggregated for this call. If this parameter is not specified, the value
in the HSU Card current call profile is used.
1.3.19 The BWR Parameter
The Bandwidth Request parameter to the CRN command selects the desired bandwidth in
terms of the minimum and maximum number of channels the HSU Card can allocate to a call.
This parameter is ignored if the SCT does not allow aggregating channels (if N is specified for
the SCT parameter). If this parameter is not specified, the value in the HSU Card current call
profile is used.