MT8982-1 Datasheet, PDF (10/19 Pages) Mitel Networks Corporation – ISO-CMOS ST-BUS™ FAMILY Small Digital Switch (MiniDX)

MT8982 ISO-CMOS
PCM
Streams
GCI CLK
(4.096 MHz)
MT8982 MiniDx
STo0
STi0
C4i
F0i F0o
STi1
STo1
Mitel Basic Rate
Phone Components
STo
STi
C4i
F0i
GCI Frame Pulse
ST-BUS 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
C4i
F0o
F0i
C4i
F0o
ST-BUS
Channel 0
Channel 4
Channel 5
Figure 9 - ST-BUS/GCI Timing with ST-BUS as Master
Channel 0
Channel 4
Channel 5
Figure 10 - ST-BUS/GCI Timing with GCI as Master
CH0
CH1
CH2
CH3
- ST-BUS and MiniDx Channels
D
C
B₁
B₂
GCI
B₁
B₂
M
D and C/I
CH0(5)
CH1(6)
CH2(7)
CH3(8)
- GCI (MiniDx) Channels
Figure 11 - Switching GCI and ST-BUS Basic Rate Access Channels
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