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7 Configuration Command Reference
7.1.3 LIU_SC_DRIVE – Set Up Path Between LIU
Synopsis
This command is used during initialization to set up a static switch path between the Line Interface Units
(LIUs) and the cross connect switch. It connects selected incoming voice timeslots from one T1/E1/J1 LIU to
a sequential block of channels on the internal switch and prepares the outgoing timeslots for subsequent use
by the MVD_MSG_SC_LISTEN message.
Note: For DSI SS7MD Boards, the <sc_channel> must originate from the same board as identified by
the <liu_id> parameter.
Syntax
LIU_SC_DRIVE <board_id> <liu_id> <sc_channel> <ts_mask> [<mode>]
Example
LIU_SC_DRIVE 0 0 512 0xfffefffe
Parameters
The LIU_SC_DRIVE command includes the following parameters:
• <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/J1 Line Interface Unit (LIU) in the range 0 to one less than the number of
LIUs.
• <sc_channel>
The channel number of the first channel to be used on the switch. This parameter should be in the range
from 0 to one less than the total number of channels on the switch.
• <ts_mask>
A 32-bit timeslot mask where each bit position is set to 1 if the corresponding timeslot on the T1/E1/J1
interface is required to be connected to the switch. The least significant bit (bit 0) represents timeslot 0.
Each timeslot for which the corresponding bit is set in <ts_mask> is connected to the switch, other
timeslots are not affected. Typically, 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, since timeslot 0 for an
E1 interface contains synchronization information, while timeslot 0 for a T1/J1 interface does not exist.
Some examples:
— 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.
• <mode>
The mode of operation that controls how the switch channels are allocated. Typically, when <mode> is
set to 1, the first timeslot connected to the switch is connected to the channel identified by
<sc_channel> and each subsequent timeslot that is connected will be connected to the next switch
channel. This allows maximum utilization of channels on the switch. An alternative, with <mode> set to
2, which should only be used if there is a specific requirement for it, associates (but does not necessarily
connect) timeslot 0 on the LIU with the channel identified by <sc_channel> and subsequent timeslots
on the LIU with subsequent switch 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 T1/E1/J1 interface but does result in a number of switch channels not being used.
The <mode> parameter is optional and may be omitted. This has the same effect as setting it to 1.