參數(shù)資料
型號： MT90500
廠商： Mitel Networks Corporation
英文描述： Multi-Channel ATM AAL1 SAR(多通道 ATM AAL1分段及重組設備（基于通訊總線的系統(tǒng)與ATM網(wǎng)絡的接口）)
中文描述： 多通道自動柜員機AAL1特區(qū)（多通道自動柜員機AAL1分段及重組設備（基于通訊總線的系統(tǒng)與空中交通管理網(wǎng)絡的接口））
文件頁數(shù)： 42/159頁
文件大?。?/td> 514K
代理商： MT90500
MT90500
42
4.3
TX_SAR Module
4.3.1
TX_SAR Overview
4.3.1.1
General
The TX_SAR block is responsible for performing CBR (Constant Bit Rate) cell assembly functions from the
TDM port towards the ATM Primary UTOPIA interface, which is typically connected to a PHY device. According
to a user-programmable timing algorithm, the TX_SAR circuit fetches data from the Transmit Circular Buffers
located in external memory and builds CBR ATM cells (AAL1, CBR-AAL0, or CBR-AAL5) which are
subsequently transferred to the MT90500 internal UTOPIA module and then to the Primary UTOPIA port. The
TX_SAR block has no direct interface to the pins of the MT90500, but ties together the TDM module and the
UTOPIA module. To construct CBR ATM cells, which must be periodically formed at the correct rate, an “event
scheduler” is used. To support different cell payload lengths and CBR AAL types, three programmable event
schedulers are provided by the TX_SAR to manage the cell transmission timing.
The TX_SAR provides enough bandwidth to allow the transmission of 1024 channels. The RX_SAR allows
reception of 1024 channels simultaneously. (For a total device capacity of 1024 bidirectional channels - all
2048 TDM time slots.)
The amount of external memory required to support the TX_SAR process depends on the number of TDM time
slots that need to be transmitted, as well as the number of simultaneous VCs. For example, the transmission of
1024 time slots over 1024 simultaneous VCs requires up to 100 Kbytes of external memory for the TX_SAR
process. Less memory is required if fewer VC connections or fewer TDM time slots are used.
4.3.1.2
Supported ATM Cell Formats
The AAL1 cell generation process supports TDM transport and trunking over standardized SDT (Structured
Data Transfer) with pointer bytes for up to n = 122 TDM channels; over pointerless Structured Data Transfer for
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Even
Parity
Even
Parity
VCI
CLP
Cell with Pointer
46 Payload Bytes
Figure 12 - AAL1 ATM Cell Format
PTI
VCI
VPI
VCI
GFC / VPI
VPI
HEC
Sequence
Count
Pointer
CSI
CRC
field
Payload Byte #1
Payload Byte #2
Payload Byte #45
Payload Byte #46
VCI
CLP
Cell without Pointer
47 Payload Bytes
PTI
VCI
VPI
VCI
GFC / VPI
VPI
HEC
Sequence
Count
CSI
Payload Byte #1
Payload Byte #2
Payload Byte #46
Payload Byte #47
Payload Byte #3
CRC
field
Even
Parity
相關(guān)PDF資料
PDF描述
MT90500 Multi-Channel ATM AAL1 SAR
MT90500AL Multi-Channel ATM AAL1 SAR
MT90502 Multi-Channel AAL2 SAR(多通道 ATM AAL2分段及重組設備（基于通訊總線的系統(tǒng)與ATM網(wǎng)絡的接口）)
MT90732AP Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
MT90732 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT90500AL 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Multi-Channel ATM AAL1 SAR
MT90500AL-ENG1 制造商:Mitel Networks Corporation 功能描述:
MT90502 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-Channel AAL2 SAR
MT90502_06 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-Channel AAL2 SAR
MT90502AG 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*