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DSI SPCI Network Interface Boards Programmer's Manual Issue 5
95
7.1.3 LIU_SC_DRIVE Command
Syntax: LIU_SC_DRIVE <board_id> <liu_id> <sc_channel>
<ts_mask> {<mode>}
Example: LIU_SC_DRIVE 0 0 512 0xfffefffe
This command is used during initialization to set up a static switch path
through the board between the Line Interface Unit (LIU) and the CT bus. It
connects selected incoming voice timeslots from an T1/E1 LIU to a sequential
block of channels on the CT bus and prepares the outgoing timeslots for
subsequent use by the MVD_MSG_SC_LISTEN message.
<board_id>
The logical identity of the board in the range from 0 to one less than the
number of boards supported.
<liu_id>
The identifier of the T1/E1 Line Interface Unit in the range 0 to one less than
the number of LIUs fitted. This parameter can also be set to the special value
0x83 to select the signaling processor instead of an LIU. In this case timeslots
0 ... 3 in the ts_mask correspond to signaling processor 0…3.
Note that, for the SPCI2S, valid values for the LIU identifiers are 2 and 3.
<sc_channel>
The channel number of the first channel to be used on the CT bus. This must
be in the range from 0 up to one less than the total number of channels on
the CT bus.
<ts_mask>
A 32 bit timeslot mask where each bit position is set to 1 if the corresponding
timeslot on the T1/E1 interface is required to be connected to the CT bus. The
least significant bit (bit 0) represents timeslot 0. Each timeslot for which the
corresponding bit is set in ts_mask is connected up to the CT bus; other
timeslots are not affected in any way.
Timeslots containing SS7 signaling that are processed by the signaling
processor on the board should not be included in the timeslot mask. Usually
the mask should be set to include all bearer (voice) timeslots but no signaling
timeslots. Bit 0 (corresponding to timeslot 0 on the LIU) must not be set.
As an example, for an E1 interface with SS7 signaling on timeslot 16, and the
remaining 30 timeslots used for voice circuits, ts_mask should be set to the
value 0xfffefffe. For a T1 interface with signaling on timeslot 24, ts_mask
should be set to the value 0x00fffffe.