Welltech SPCI2S Intel NetStructure SS7 Boards - Manual (Page 95)

SS7 Programmer’s Manual for SPCI2, SPCI4 and CPM8 Issue 2 Page 95
A1.3 LIU_SC_DRIVE Command
Syntax: LIU_SC_DRIVE {}
Example: LIU_SC_DRIVE 0 0 512 0xfffefffe
This command is used during initialisation to set up a static switch path through the card between the
Line Interface Unit (LIU) and the CT bus. It connects selected incoming voice timeslots from an
E1/T1 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.
The logical identity of the board in the range from 0 to one less than the number of boards supported.
The identifier of the E1/T1 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 signalling processor
instead of an LIU. In this case timeslots 0..3 in the ts_mask correspond to signalling processor 0..3.
The channel number of the first channel to be used on the CT bus. This should be in the range from
0 up to one less than the total number of channels on the CT bus.
A 32 bit timeslot mask where each bit position is set to 1 if the corresponding timeslot on the E1/T1
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 will be connected up to the CT bus;
other timeslots will not be affected in any way.
Timeslots containing SS7 signalling that will be processed by the signalling processor on the card
should not be included in the timeslot mask. Usually the mask should be set to include all bearer
(voice) timeslots but no signalling timeslots. Bit 0 (corresponding to timeslot 0 on the LIU) must not
be set.
As an example, for an E1 interface with SS7 signalling 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 signalling
on timeslot 24, ts_mask should be set to the value 0x00fffffe
This parameter allows the user to select how the CT bus channels are allocated. Usually (mode=1)
the first timeslot connected to the CT bus is connected to sc_channel and each subsequent timeslot
that is connected will be connected to the next CT bus channel. This allows maximum utilisation of
channels on the CT bus.
An alternative mode (mode=2) (that should only be used if there is a specific requirement for it)
associates (but does not necessarily connect) timeslot 0 on the LIU with sc_channel and subsequent
timeslots on the LIU with subsequent CT bus channels. Connections are only made when the
corresponding bit in the timeslot mask is set to 1. This mode of operation preserves the spacing
between timeslots that was originally found on the E1/T1 interface but does result in a number of CT
bus channels being not used.
The mode parameter is optional and may be omitted altogether. This will have the same effect as
setting it to 1.