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參數(shù)資料
| 型號： | MT9075B |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | E1 Single Chip Transceiver |
| 中文描述： | 素E1單芯片收發(fā)器 |
| 文件頁數(shù)： | 11/78頁 |
| 文件大?。?/td> | 347K |
| 代理商： | MT9075B |
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Preliminary Information
MT9075B
11
Depending on the mode selected, the Jitter
Attenuator (JA) can attenuate either transmit clock
jitter or receive clock jitter, or be disconnected.
Control bits JAS, JAT/JAR (address 18H of page
02H) determine the JA selection under certain
modes. Table 2 shows the configuration of related
control pins and control bits required to place the
MT9075B in the appropriate jitter attenuation mode.
Referring to the mode names given in Table 2, the
basic operation of the jitter attenuation modes is
summarized as follows:
In SysBusSync (1-3) modes, pins C4b and
F0b are always configured as inputs, while in
the Line Synchronous and Free-Run modes
C4b and F0b are configured as outputs.
In SysBusSync1mode, an external clock is
applied to
C4b. The applied clock is
dejittered by the internal PLL before being
used to transmit data. The clock extracted
(with no jitter attenuation performed) from
the receive data can be monitored on pin
E2o.
In SysBusSync2mode, the clock applied to
pin C4b is assumed to be jitter-free and is
directly used to transmit data. The internal
PLL is used to dejitter the extracted receive
clock. The dejittered receive clock is output
on pin E2o.
In SysBusSync3mode, no jitter attenuation
is applied to either the transmit or receive
clocks. The transmit data is synchronized to
clock applied to pin C4b. The extracted
receive clock is not dejittered and is supplied
directly to the E2o output.
In
extracted from the receive data is dejittered
using the internal PLL and then output on pin
C4b. Pin E2o provides the extracted receive
Line Synchronousmode, the clock
clock before it has been dejittered. The
transmit data is synchronous to the clean
receive clock.
In Free-Runmode the transmit data is
synchronized to the internally generated
clock. The internal clock is output on pin
C4b. The clock signal extracted from the
receive data is not dejittered and is output
directly on pin E2o.
The PCM 30 Interface
PCM 30 (E1) basic frames are 256 bits long and are
transmitted at a frame repetition rate of 8000 Hz,
which results in an aggregate bit rate of 256 bits x
8000/sec = 2.048 Mbits/sec. The actual bit rate is
2.048 Mbits/sec +/-50 ppm encoded in HDB3 format.
The HDB3 control bit (page 01H, address 15H, bit 5)
selects either HDB3 encoding or alternate mark
inversion (AMI) encoding. Basic frames are divided
into 32 time slots numbered 0 to 31, see Figure 31.
Each time slot is 8 bits in length and is transmitted
most significant bit first (numbered bit 1). This results
in a single time slot data rate of 8 bits x 8000/sec. =
64 kbits/sec.
It should be noted that the Mitel ST-BUS also has 32
channels numbered 0 to 31, but the most significant
bit of an eight bit channel is numbered bit 7 (see
Mitel Application Note MSAN-126). Therefore, ST-
BUS bit 7 is synonymous with PCM 30 bit 1; bit 6
with bit 2: and so on (Figure 31).
PCM 30 time slot 0 is reserved for basic frame
alignment, CRC-4 multiframe alignment and the
communication of maintenance information. In most
configurations time slot 16 is reserved for either
Channel Associated Signalling (CAS or ABCD bit
signalling) or Common Channel Signalling (CCS).
The remaining 30 time slots are called channels and
carry either PCM encoded voice signals or digital
Table 2 - Selection of Clock Jitter Attenuation Modes
Mode Name
BS/LS
BL/FR
JAS
JAT/JAR
Note
SysBusSync1
1
1
1
1
JA on Tx side; No JA on Rx side
SysBusSync2
1
1
1
0
JA on Rx side; No JA on Tx side
SysBusSync3
1
1
0
x
No JA on Tx or Rx side
Line
Synchronous
0
1
x
x
By default, JA is on the receive side.
Controls bits need not be selected.
Free-Run
x
0
x
x
In free-run mode JA will be automatically
disconnected
相關PDF資料 |
PDF描述 |
|---|---|
| MT9075B | E1 Single Chip Transceiver(E1單片收發(fā)器) |
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| MT9075A | E1 Single Chip Transceiver |
| MT9075AL | E1 Single Chip Transceiver |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT9075B-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:E1 Single Chip Transceiver |
| MT9075BL | 制造商:Microsemi Corporation 功能描述:FRAMER E1 5V 100MQFP - Trays |
| MT9075BL1 | 制造商:Microsemi Corporation 功能描述:FRAMER E1 5V 100MQFP - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX SGL E1 W/LIU 100MQFP 制造商:Microsemi Corporation 功能描述:IC TXRX SGL E1 W/LIU 100MQFP |
| MT9075BP | 制造商:Microsemi Corporation 功能描述: |
| MT9075BP1 | 制造商:Microsemi Corporation 功能描述:Single Chip Transceiver 1TX 1RX 2.048Mbps 68-Pin PLCC Tube 制造商:Microsemi Corporation 功能描述:FRAMER E1 5V 68PLCC - Rail/Tube 制造商:Microsemi Corporation 功能描述:PB FREE E1 SINGLE CHIP TRANSCEIVER 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX SGL E1 W/LIU 68PLCC 制造商:Microsemi Corporation 功能描述:IC TXRX SGL E1 W/LIU 68PLCC |
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