Welltech SPCI2S Intel NetStructure SS7 Boards - Manual (Page 42)

SS7 Programmer’s Manual for SPCI2, SPCI4 and CPM8 Issue 2 Page 42
Bit 6 and 7 together select the initial CT bus clocking mode as shown in the
following table. The clocking mode can subsequently modified dynamically
using the MVD_MSG_CNFCLOCK message.
Bit 7 Bit 6 CT bus clocking mode
0 0 The CT bus interface is disabled - In this mode the card is
electrically isolated from the other cards using the CT bus. The CT
bus connection commands may still be used, but the connections
made will only be visible to this card. When using this mode, the on-
board clocks will be synchronised to the source selected by bit 0 of
this flags parameter.
0 1 Primary Master, A Channel - The board will drive CT bus clock set
A using the clock source selected by bit 0 of this flags parameter.
1 0 Secondary Master, B Channel - The board is configured to drive
clock set B in Secondary Master mode. It will automatically switch to
become Primary Master if the board driving clock set A fails. While
acting as Secondary Master the on-board clocks will be
synchronised to the CT bus clock set A.
1 1 Slave, initially A Channel – The board uses the CT bus clocks,
which must be generated by another board on the CT bus. Initially
the board will recover from clock set A, though will switch over
automatically to recover from clock set B should set A fail.
Bit 13 causes the board to drive the CT_NETREF1 clocks on the CT bus when
set to 1. The highest priority in-sync line interface will be used as a clock
source. If this bit is set to zero then the CT_NETREF1 clock will not be driven.
All other bits are reserved and should be set to zero.
l2_flags - level 2 flags
Bit 1 should be set to 1 for ANSI operation or zero for ITU-T operation.
Bit 3 should be set to 1 for ANSI operation or zero for ITU-T operation.
Bit 5 is set to 1 to cause Link Status Signal Units (LSSU) to have a two octet
status field. Otherwise LSSUs will have a single octet status field. Usually this
bit should be set to 0.
All other bits are reserved for future use and should be set to zero.
max_sif_len - maximum Signalling Information Field length
The maximum Signalling Information Field length in octets that is permitted
over the signalling link. Usually this should be set to 272 although it can also be
set to 62 for inter-working to switches that do not support 272 octet messages.