MT8982 ISO-CMOS
Mitel Basic Rate
Phone Components
MT8982 MiniDx
STo0
STi0
STo
STi
PCM
Streams
STi1
STo1
GCI CLK
(4.096 MHz)
C4i
C4i
F0i
F0o
F0i
ST-BUS Frame Pulse
GCI Frame Pulse
Figure 8 - GCI/ST-BUS Interface
MT8982. Therefore, to connect GCI channel B1 to
ST-BUS channel B1, the MT8982 must be
programmed to connect channel 5 to channel 2. The
five channel offset ensures that all four basic rate
channels will be switched together within one frame
period, regardless which direction the data is being
switched.
The five channel offset for GCI channels is required
even in GCI to GCI switching systems. For example,
to switch GCI channel B1 to GCI channel B2, the
MT8982 must be programmed to connect channel 5
to channel 6.
F0i
Channel 0
Channel 4
Channel 5
C4i
F0o
Figure 9 - ST-BUS/GCI Timing with ST-BUS as Master
Channel 0
Channel 4
Channel 5
F0i
C4i
F0o
Figure 10 - ST-BUS/GCI Timing with GCI as Master
- ST-BUS and MiniDx Channels
CH0
D
CH1
C
CH2
CH3
ST-BUS
B
B
2
1
GCI
D and C/I
CH3(8)
B
B
M
1
2
CH0(5)
CH1(6)
CH2(7)
- GCI (MiniDx) Channels
Figure 11 - Switching GCI and ST-BUS Basic Rate Access Channels
2-40
MITEL [ MITEL NETWORKS CORPORATION ]
