參數(shù)資料
型號(hào)： MT90221
廠商： Mitel Networks Corporation
英文描述： Quad IMA/UNI PHY Device(四端口 IMA/UNI 物理層設(shè)備（四端口ATM IMA和UNI處理器）)
中文描述： 四IMA的/單向物理層設(shè)備（IMA的四端口/單向物理層設(shè)備（四端口自動(dòng)柜員機(jī)IMA的和單向處理器））
文件頁(yè)數(shù)： 20/116頁(yè)
文件大小： 309K
代理商： MT90221
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MT90221
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 MT90221 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 MT90221 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 MT90221 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 MT90221
Byte 6 - the
TX OAM
Label is defined by the
software and the value contained in this
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)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT90221AL 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:Quad IMA/UNI PHY Device
MT90222 制造商:ZARLINK 制造商全稱(chēng):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
MT90222AG2 制造商:Microsemi Corporation 功能描述:ATM IMA 40MBPS 2.5V 384BGA /BAKE/DRYPACK - Trays
MT90223AG 制造商:Microsemi Corporation 功能描述:ATM IMA 80MBPS 2.5V 384BGA - Trays
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