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| 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)： | 16/116頁(yè) |
| 文件大小： | 309K |
| 代理商： | MT90221 |
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MT90221
8
1.0 Device Architecture
The MT90221, supported by software, implements
the
ATM
Forum
Inverse
Asynchronous Transfer Mode (IMA) Specification.
This approach minimizes the impact of any changes
that might occur in the specification. Actions are
implemented by the MT90221 and decisions by the
software.
Multiplexing
for
The MT90221 supports the following two major
modes of operation:
the IMA mode (as defined by the ATM Forum
IMA Specification)
the User Network Interface (UNI) mode
Up to four IMA Groups can be implemented. Any of
the
four
PCM
Interfaces
dynamically to any of these IMA Groups. A different
UTOPIA PHY address is assigned to each of the IMA
Groups.
can
be
assigned
The UNI mode is used to transfer the cells from the
UTOPIA Interface to a PCM port without any
overhead. Up to 4 UTOPIA PHY addresses can be
supported in UNI mode.
The MT90221 also supports a mixed mode where
the PCM Interfaces not assigned to an IMA Group
can be used in UNI mode.
The IMA implementation is divided into hardware
and software functions. The MT90221 implements
the hardware functions. The software functions are
implemented by the user. The hardware and
software functions are described below. Notice that a
number of MT90221 functions are included to assist
in the collection of statistical information. This
information supports the MIB implementation.
1.1
For the MT90221 to comply with the IMA
specification, the following functions must be
implemented by software:
the transmit and receive Link State Machines
(LSM)
the IMA Group State Machines (GSM)
the IMA Group Traffic State Machines (GTSM)
the Operations and Maintenance (OAM)
functions
Software Functions
1.1.1
The software implemented transmit and receive
LSMs are independent (i.e., each link has its own
LSM). LSMs rely on various events from the
Link State Machines
MT90221 interface, such as cell errors, excessive
delay between-links, etc.; or, from the T1 or E1
framer, such as Loss Of Signal (LOS), Loss Of
Frame (LOF), Remote Alarm Indication (RAI) etc.
On-chip registers are used to generate the ICP cells
that communicate the LSM states to the Far End
(FE).
1.1.2
The IMA GSMs and Group Traffic State Machines
(GTSM) must be implemented in software. One of
each state machine should be implemented for each
IMA Group.
IMA Group State Machines
On-chip registers are used to generate the ICP cells
that communicate the various states to the FE.
1.1.3
The addition, removal or restoration of a link is
controlled by software using the various control
registers in the MT90221 and in the T1 or E1
framers. Decisions are based on the MT90221 and
T1 or E1 framers status registers.
Link Addition, Removal or Restoration
1.1.4
The MT90221 provides numerous registers and
counters to implement a polling and/or interrupt
mechanism for tracking link and IMA Group status.
This traffic in and out information is used by the
Management Information Base (MIB) for each IMA
Group.
Interrupt
1.1.5
The microprocessor controls the operation of the T1
or E1 link by providing handshaking between the FE
and Near Ends (NE) including such functions as
signaling and loopback controls. Rate adjustment is
controlled by:
Signaling and Rate Adjustment
adding or removing one or more T1 or E1 links
providing feedback to the ATM network for adjust-
ing the ATM traffic.
1.1.6
Software implements most of the performance
monitoring.
The
MT90221
information for:
the Cell Delineation Block and IMA Frame State
Machine
the number of ICP violations
the total number of cells
the number of idle or discarded cells.
Performance Monitoring
provides
status
相關(guān)PDF資料 |
PDF描述 |
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| MT90401 | SONET/SDH System Synchronizer(SONET/SDH 系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）) |
| MT9040 | T1/E1 Synchronizer(T1/E1 系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）) |
| MT9041A | () |
| MT9041B | T1/E1 System Synchronizer(T1/E1系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）) |
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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: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 |
| 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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