MT8979
BIT
7
6
5
ISO-CMOS
DESCRIPTION
Keep at ‘1‘ for normal operation.
Keep at ‘0‘ for normal operation.
Common Channel Signalling:
If 1, then the MT8979 operates in its common channel
signalling mode. Channel 16 on the DSTi pin is transmitted on timeslot 16 of the CEPT
link, and timeslot 16 from the received CEPT link is output on channel 16 on the DSTo
pin. Channel 15 on the CSTi0 pin contains the information for the control of timeslot 16.
Channels 0 to 15 on CSTi1 and CSTo are unused.
If ‘0‘, the device is in channel associated signalling mode where channel 16 is used to
transmit the ABCD signalling bits.
8KHz Select:
If ‘1‘, then an 8 kHz signal synchronized to the received CEPT 2048 kbit/s
link is output on the E8Ko pin. This feature is only valid when frame synchronization is
received from the CEPT link.
If ‘0‘, then the E8Ko pin goes into its high impedance state.
Transmit Alarm Indication Signal:
If ‘1‘, then an all 1’ s alarm signal is transmitted on all timeslots.
If ‘0‘, then the timeslots functions normally.
Transmit Timeslot 16 Alarm Indication Signal:
If ‘1‘, then an all 1’s alarm signal is transmitted on timeslot 16.
If ‘0‘, then timeslot 16 functions normally.
External Control:
If ‘1‘, then the XCtl pin is driven high.
If ‘0‘, then the XCtl pin is driven low.
(unused)
NAME
(N/A)
(N/A)
CCS
4
8KHzSEL
3
TXAIS
2
TXTS16AIS
1
XCTL
0
(N/A)
Table 4. Master Control 2 (MCW2): Data Format for CSTi0 Channel 31
BIT
7-4
NAME
MA1-4
DESCRIPTION
Transmit Multiframe Alignment Bits 1 to 4:
These bits are transmitted on the CEPT
2048 kbit/s link in bit positions 1 to 4 of timeslot 16 of frame 0 of the multiframe. They
should be kept at ‘0‘ to allow multiframe alignment to be detected.
This bit is transmitted on the CEPT 2048 kbit/s link in bit position 5 of timeslot 16 of
frame 0 of the multiframe. It is a spare bit which should be kept at ‘1‘ if unused.
This bit is transmitted on the CEPT 2048 kbit/s link in bit position 6 of timeslot 16 of
frame 0 of the multiframe. It is used to indicate the loss of multiframe alignment to the
remote end of the link. A ‘1‘ on this bit is the signal that multiframe alignment on the
received link has been lost. A ‘0’ indicates that multiframe alignment is detected.
These bits are transmitted on the CEPT 2048 kbit/s link in bit positions 7 and 8
respectively, of timeslot 16 of frame 0 of the multiframe. They are spare bits which
should be kept at ‘1‘ if unused.
3
2
X1
Y
1,0
X2,X3
Table 5. Multiframe Alignment Signal: Data Format for CSTi1 Channel 0
on the Transmitted CEPT Link
4-172
MITEL [ MITEL NETWORKS CORPORATION ]
