MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 80

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

MT90812
23.0 Applications
23.1
Fig. 28 shows the channel assignment for the local TDM streams used to support the stations, trunks and
analog ports for a typical configuration. There are 8 stations supported by MT9171/72 DNIC transceivers, 8
analog ports supported by 8 Codecs and 4 trunks supported by another 4 Codecs.
In this example, the B-channel information is on the STi/o0 streams. The C- and D-channel information is
placed on the STi/o1 streams (Dual Port mode).
The local STi/o0 and STi/o1 channel assignment is summarized in Table 21.
23.2
The MT90812 supports direct connection to the DNICs placed in Digital Network (DN), Dual Port mode. The
DNIC transfers four channels of information via the DV and CD ports. They are B1, B2, C and D-channels. The
B1 and B2 channels each have a bandwidth of 64 kbit/s and are used for carrying PCM encoded voice or data.
The C-channel, having a bandwidth of 64kbit/s, provides a means for the system microprocessor to control the
DNIC and for the DNIC to pass status information back to the system microprocessor. The D-Channel can be
transmitted and received on the line with either 8, 16, or up to 64 kbit/s bandwidth. To support this, the
MT90812 provides buffering of 1, 2 or 8 bits per frame to support D-Channel end to end signalling or low speed
data transfer.
76
Channel
12-15
16-19
20-27
28-31
4-11
0-3
Local TDM Channel Assignment
DNIC Channel Assignment
F0i
channel
STi/o0
STi/o1
Figure 28 - MT90812 Local TDM Channel Assignment for Typical Configuration
0-3
B1 Trunk
C Trunk
# of channels
i
1-4
1-4
4
8
4
4
8
4
4-7
B1 DNIC
D DNIC
Table 21 - TDM Channel Assignment
1-4
1-4
Trunk CODEC 1-4
DNIC 1-8
CODEC 1-4
CODEC 5-8
DNIC 1-8
Unused.
8-11
B1 DNIC
D DNIC
frame n
5-8
5-8
12-15
Codec
C Codec
Device
1-4
1-4
16-19
Codec
Codec
i+16
5-8
5-8
20-23
B2 DNIC
C DNIC
5-8
1-4
24-27
B2 DNIC
C DNIC
Advance Information
STi/o0
B1
B1
B1
B1
B2
-
5-8
5-8
28-31
Unused
Unused
i+32
STi/o1
C
D
C
C
C
-