- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384759 > MT90220AL (Mitel Networks Corporation) Octal IMA/UNI PHY Device PDF資料下載
參數(shù)資料
| 型號： | MT90220AL |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Octal IMA/UNI PHY Device |
| 中文描述： | 八路IMA的/單向物理層設(shè)備 |
| 文件頁數(shù)： | 20/116頁 |
| 文件大?。?/td> | 306K |
| 代理商： | MT90220AL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當(dāng)前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁
MT90220
12
The clocking mode and reference link are fixed once
an IMA Group is setup and should remain
unchanged so long as that group is operational. The
reference link should not change unless problems
are reported with the link.
2.4.4
The Stuff event algorithm differs between CTC and
ITC modes. In CTC mode, the Stuff event is typically
fixed and appears in the same IMA frame on all IMA
Group links. In ITC mode, the Stuff event is
determined using an adaptive algorithm that relates
the level of the internal TX Link FIFO to that of the
TX link FIFO of the Reference link.
Stuff Cell Rate
The MT90220 implements 2 different stuffing
algorithms: a fixed stuffing rate and an adaptive
stuffing rate. The Stuffing events do not happen
more frequently than once every five IMA frames.
TX Group Control Mode
register bit 3 selects either
the adaptive or fixed algorithm. Bit 4 determines the
timing mode declared in the ICP cell.
There are three possible combinations:
CTC Mode with internal Fixed algorithm
CTC Mode with internal Adaptive algorithm
ITC Mode with internal Adaptive algorithm
In CTC mode, when using the Fixed algorithm, the
Stuff event is periodic and will appear in the same
IMA frame, once every 2048 cells, on each link that
is part of the IMA Group.
In CTC mode, when using the Adaptive algorithm,
the Stuff event will occur at an average rate of once
every 2048 cells on each link and may not occur in
the same IMA Frame on all the links.
In ITC mode, the Stuff event is determined using the
adaptive algorithm that relates the level of the
internal TX Link FIFO with that of the TX Link FIFO
of the Reference link. The reference link has one
Stuff event every 2048 cells.
The state of bit seven in the
TX IMA Control
register
determines whether a Stuff indication is generated in
the first or first four frames preceding a Stuff event.
2.4.5
The MT90220 computes the internal TX IMA Data
Cell Rate (IDCR) for each IMA Group. The cell rate
for the IMA Group reference link, specified in the
TX
Group Control Mode
register, is integrated over a
programmable period of time. The preferred
integration period is programmed in the TX IDCR
IMA Data Cell Rate
Integration register and the value is indicated in
Table 1.
Table 1 - IDCR Integration Register Value
2.4.6
The IMA controller produces the cell stream to be
sent to the PCM blocks using the following four cell
types:
Data cells received from the UTOPIA port (User
cells)
Filler cells
IMA ICP cells with Link status information
Stuff cells
At an IDCR clock tick, the RoundRobin scheduler
inserts either an ICP cell, a User cell or a Filler cell
into the TX Link FIFO of the next link of the IMA
group, based on ascending link ID numbers. An ICP
cell is inserted every M cells and a stuff event is
inserted when indicated by the stuffing algorithm.
IMA Controller (RoundRobin Scheduler)
If it is not time for an ICP cell and if the traffic is not
enabled for the link (see bit 6 of the
TX Link Control
register), then a Filler cell is inserted in the TX Link
FIFO. If the traffic is enabled and there is a User cell
in the TX Utopia FIFO, then the User cell is
transferred from the TX UTOPIA FIFO to the TX Link
FIFO. If there is no User cell in the TX UTOPIA FIFO,
then a Filler cell is inserted in the TX Link FIFO.
2.4.7
Once per IMA frame, an ICP cell is transmitted on
each link of the IMA Group. The content of the ICP
cell is controlled both by MT90220 and software. The
software content of the ICP cell bytes is stored in
buffer RAM. A copy of the ICP cell for each group is
kept in the internal Transmitter Cell RAM.
ICP Cell Generator
The ICP cell to be transmitted on each link is
assembled on an as required basis under the control
of the internal RoundRobin scheduler and ICP Cell
Modifier.
Hardware controls the following bytes of the ICP cell:
Byte 5 - the HEC is always calculated and
inserted by the MT90220
Byte 6 - the
TX OAM
Label is defined by the
software and the value contained in this
location is transmitted in all ICP cells, Stuff
PCM Mode
Preferred Value
TX IDCR Integration
register
0x09 (2
16
clocks)
0x0B (2
18
clocks)
0x0C (2
19
clocks)
T1 ISDN (23 channels)
T1 (24 channels)
E1(30 channels)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT90221 | Quad IMA/UNI PHY Device |
| MT90221AL | Quad IMA/UNI PHY Device |
| MT9041B | T1/E1 System Synchronizer |
| MT9041BP | T1/E1 System Synchronizer |
| MT9041 | Multiple Output Trunk PLL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90220ALX01 | 制造商:Mitel Networks Corporation 功能描述: |
| MT90221 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Quad IMA/UNI PHY Device |
| MT90221AL | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Quad IMA/UNI PHY Device |
| MT90222 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:4/8/16 Port IMA/TC PHY Device |
| MT90222AG | 制造商:Microsemi Corporation 功能描述:ATM IMA 40MBPS 2.5V 384BGA - Trays |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。