6 Message Reference
54
Description:
This message is sent to the DSI SPCI Board to configure the operating mode
a line interface unit. All configuration parameters must be supplied in the
message (it is not possible to modify individual operating parameters in
isolation). On receipt of the message the board first verifies that the fitted
hardware options support the requested operating mode and then initializes
(or re-initializes) the line interface unit.
The confirmation message (if requested) indicates success by status of zero.
Parameter Description:
A description of the permitted parameter values are given below. When the
DSI SPCI Board is initially configured all the line interfaces are initialized to a
disabled condition.
liu_type
The physical type of interface according to the following table: (note that this
must be selected by the user to be appropriate for the actual hardware fitted
otherwise an error status is returned). The preferred method for configuring
an E1 interface is to select liu_type=5.
liu_type
Description
1
Disabled (used to deactivate a LIU). In this mode the LIU does not produce
an output signal.
2
E1 75ohm unbalanced interface (for future use).
3
E1 120ohm balanced interface.
4 T1
5
E1 75ohm or 120ohm setting based on fitted hardware.
line_code
The line coding technique taken from the following table:
line_code
Description
1 HDB3
(E1
only).
2
AMI with no Zero Code Suppression.
3
AMI with Zero Code Suppression (The appropriate bit in the clear_mask
parameter may be set to disable Zero Code Suppression for individual
timeslots if required.) (T1 only).
4
B8ZS (T1 only).
frame_format
The frame format taken from the following table:
