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參數(shù)資料
| 型號： | MT90812 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Integrated Digital Switch (IDX)(集成數(shù)字開關(guān)) |
| 中文描述： | 綜合數(shù)字交換機（IDX的）（集成數(shù)字開關(guān)） |
| 文件頁數(shù)： | 46/105頁 |
| 文件大?。?/td> | 334K |
| 代理商： | MT90812 |
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MT90812
Advance Information
42
The second condition occurs if the Auto-hunt circuit manages to cycle back to monitor a peripheral which is
already the currently active receive channel. Because the peripheral continues to send request-to-sends
during the time when it is being acknowledged with a go-ahead from the RX circuitry, it is important that flags
not be detected twice for the same request. This condition is prevented by disabling scanning on a currently
active receive channel.
The third condition that causes the Auto-hunt circuit to skip a channel, is if it has been locked out by the
system. This allows the system to independently disable reception from any channel. On reset, all 16 D-
channels are locked out, and the system must specify which channels are to be enabled for receive activity.
The two HDLC CTRL Lockout registers are described in Section 22.30 and Section 22.31.
The fourth condition that will cause the Auto-hunt circuit to skip a channel occurs when the scanned-channel
number is the same as an active TX channel. The channel is skipped in this case to reduce the contention
between a system transmit packet and the transmission of a CTS. If a flag has been detected before the
transmitter goes active on the same channel, then the contention, described in “TX and RX Handshaking” on
page 38, will occur. However, if the transmitter goes active at any point before a flag is detected, then
contention will be avoided.
14.1.7
A receive packet will be terminated when the HDLC controller asserts the REOP strobe for one bit period, one
bit time after the closing flag is received. If desired, the system may assert its own SREOP flag via the micro
interface. The SREOP bit is in “HRA CTRL Register 2 (HC2)” on page 71. This flag has the same effect as the
normal REOP strobe, but may be written asynchronously and will be cleared by the RX circuit after it has been
acted upon. In either case, a receive end-of-packet will cause RXACT to go low, disabling RxCEN.
Receive Packet Termination
15.0 C-Channel Data
C-Channel access for Codec or DNIC control is provided through Message Mode (refer to “Connection
Memory” on page 10). The C-Channel information can be read from Data Memory or written to Connect
Memory.
C-Channel data status information is very static. Therefore, the interface as provided via Message Mode is
single buffered. Hence, the C-channel information may change every frame.
16.0 Tone Generation
The MT90812 generates the standard 16 DTMF frequencies within +/- 0.6% of the nominal standard
frequencies. Table 13 shows the standard DTMF frequencies, the coefficient used to generate the closest
frequency, the actual frequency generated and the percent deviation of the generated tone from the nominal.
Table 13 - DTMF Frequencies
Tone
Group
Frequency Hz
Coefficient
Actual Frequency
% Deviation
Low
697
59H
695.31
-0.24%
770
62H
765.63
-0.56%
852
6DH
851.56
-0.05%
941
78H
937.50
-0.37%
High
1209
8DH
1203.12
-0.49%
1336
96H
1343.75
+0.58%
1477
9FH
1484.38
+0.50%
1633
A9H
1640.62
+0.47%
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90812AL | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 64MQFP - Trays 制造商:Zarlink Semiconductor Inc 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 64MQFP - Trays |
| MT90812AL1 | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 64MQFP - Trays 制造商:Microsemi Corporation 功能描述:PB FREE INTEGRATED DIGITAL SWITCH |
| MT90812AP | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated Digital Switch (IDX) |
| MT90812AP1 | 制造商:Zarlink Semiconductor Inc 功能描述:SWIT FABRIC 192 X 192 16.384MBPS 5V 68PLCC /BAKE/DRYPACK - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:INTEGRATED DIGITAL SWCH |
| MT90812APR | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 192 X 192/64 X 64 1.048GBPS 5V 68PLCC - Tape and Reel |
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