參數(shù)資料
型號： MT9079
廠商： Mitel Networks Corporation
英文描述： Advanced Controller for E1(先進的E1幀調節(jié)器和控制器)
中文描述： 高級控制器素E1（先進的素E1幀調節(jié)器和控制器）
文件頁數(shù)： 11/60頁
文件大?。?/td> 347K
代理商： MT9079
MT9079
4-217
TAIS Operation
The TAIS (Transmit AIS) pin allows the PRI interface
to transmit an all ones signal form the point of
power-up without writing to any control registers.
After the interface has been initialized normal
operation can take place by making TAIS high.
National Bit Buffers
Table 4 shows the contents of the transmit and
receive Frame Alignment Signals (FAS) and
Non-frame Alignment Signals (NFAS) of time slot
zero of a PCM 30 signal. Even numbered frames
(CRC Frame # 0, 2, 4, ...) are FASs and odd
numbered frames (CRC Frame # 1, 3, 5, ...) are
NFASs. The bits of each channel are numbered 1 to
8, with 1 being the most significant and 8 the least
significant.
Table 4 - FAS and NFAS Structure
Table 5 illustrates the organization of the MT9079
transmit and receive national bit buffers. Each row is
an addressable byte of the MT9079 national bit
buffer, and each column contains the national bits of
an odd numbered frame of each CRC-4 Multiframe.
The transmit and receive national bit buffers are
selectible in microprocessor or microcontroller
modes, but cannot be accessed in ST-BUS mode. In
ST-BUS mode access to the national bits can be
achieved through the Transmit and Receive
Non-frame Alignment Signal (CSTi0 and CSTo).
When selected, the Data Link (DL) pin functions
override the transmit national bit buffer function.
The CALN (CRC-4 Alignment) status bit and
maskable interrupt CALNI indicate the beginning of
every received CRC-4 multiframe.
Table 5 - MT9079 National Bit Buffers
Note: NBB0 - NBB4 are addressable bytes of the MT9079
transmit and receive national bit buffers.
Data Link Operation
The MT9079 has a user defined 4 kbit/sec. data link
for the transport of maintenance and performance
monitoring information across the PCM 30 link. This
channel functions using one of the national bits (S
a4
,
S
a5
, S
a6
, S
a7
or S
a8
) of the PCM 30 channel zero
non-frame alignment signal. The S
a
bit used for the
DL is selected by making one of the bits, S
a4
- S
a8
,
high in the Data Link Select Word. Access to the DL
is provided by pins DLCLK, TxDL and RxDL, which
allow easy interfacing to an HDLC controller.
The 4 kHz DLCLK output signal is derived from the
ST-BUS clocks and is aligned with the receive data link
output RxDL. The DLCLK will not change phase with a
received frame slip, but the RxDL data has a 50%
chance of being lost or repeated when a slip occurs.
The TxDL input signal is clocked into the MT9079 by
the rising edge of an internal 4 kHz clock (e.g., internal
data link clock IDCLK). The IDCLK is 180 degrees out
of phase with the DLCLK. See Figures 20 and 21 for
timing requirements.
CRC
CRC
Frame/
Type
PCM 30 Channel Zero
1
2
3
4
5
6
7
8
S
0/FAS
C
1
0
0
1
1
0
1
1
1/NFAS
0
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
2/FAS
C
2
0
0
1
1
0
1
1
3/NFAS
0
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
4/FAS
C
3
0
0
1
1
0
1
1
5/NFAS
1
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
6/FAS
C
4
0
0
1
1
0
1
1
7/NFAS
0
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
8/FAS
C
1
0
0
1
1
0
1
1
9/NFAS
1
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
10/FAS
C
2
0
0
1
1
0
1
1
11/NFAS
1
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
12/FAS
C
3
0
0
1
1
0
1
1
13/NFAS
E
1
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
14/FAS
C
4
0
0
1
1
0
1
1
15/NFAS
E
2
1
ALM S
a4
S
a5
S
a6
S
a7
S
a8
i
ndicates position of CRC-4 multiframe alignment signal.
Addre
ssable
Bytes
Frames 1, 3, 5, 7, 9, 11, 13 & 15 of a CRC-4
Multiframe
F1
F3
F5
F7
F9
F11
F13
F15
NBB0
S
a4
S
a4
S
a4
S
a4
S
a4
S
a4
S
a4
S
a4
NBB1
S
a5
S
a5
S
a5
S
a5
S
a5
S
a5
S
a5
S
a5
NBB2
S
a6
S
a6
S
a6
S
a6
S
a6
S
a6
S
a6
S
a6
NBB3
S
a7
S
a7
S
a7
S
a7
S
a7
S
a7
S
a7
S
a7
NBB4
S
a8
S
a8
S
a8
S
a8
S
a8
S
a8
S
a8
S
a8
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相關代理商/技術參數(shù)
參數(shù)描述
MT9079AC 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS? FAMILY Advanced Controller for E1
MT9079AE 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS? FAMILY Advanced Controller for E1
MT9079AL 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS⑩ FAMILY Advanced Controller for E1
MT9079AP 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS⑩ FAMILY Advanced Controller for E1
MT9079APR 制造商:Microsemi Corporation 功能描述:FRAMER E1 5V 44PLCC - Tape and Reel
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