Specifications
Dialogic
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DSI SS7HD Network Interface Boards Programmer's Manual Issue 11
79
sc_channel
The channel number of the first channel to be used on the CT Bus. This should be in
the range from 0 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/J1 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 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. 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 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 CT Bus channels are allocated. Typically,
when mode is set to 1, the first timeslot connected to the CT Bus is connected to the
timeslot indicated by sc_channel and each subsequent timeslot that is connected will
be connected to the next CT Bus channel. This allows maximum utilization of channels
on the CT Bus.
An alternative, with mode is 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 CT Bus timeslot specified by 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 T1/E1/J1 interface but does result
in a number of CT Bus channels being not used.