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| 型号： | IDT82V2608BB |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | INVERSE MULTIPLEXING FOR ATM |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PBGA208 |
| 封装： | PLASTIC, BGA-208 |
| 文件页数： | 30/98页 |
| 文件大小： | 398K |
| 代理商： | IDT82V2608BB |
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IMA AND UNI FUNCTIONS
30
December 4, 2006
IDT82V2608
Inverse Multiplexing for ATM
4
IMA AND UNI FUNCT IONS
1
The IDT82V2608 is capable of combining the transport bandwidth of
multiple links into one single logical link. The logical link is called a
group. The IDT82V2608 supports up to 4 independent groups with each
group capable of supporting from1 to 8 links. Links that are assigned to
an IMA group are called in IMA mode while links that are not assigned to
any IMA group can be used in UNI mode.
4.1
IMA MODE
4.1.1
IMA FRAME
An IMA frame is defined as Mconsecutive cells, numbered from0 to
M-1 on each link, across all the links in an IMA group. It is generated by
inserting an ICP cell after every M-1 cells per link. Values of Msupported
are 32, 64, 128 and 256, which can be programmed for all the links in a
group by
ConfigGroupPara
command. The ICP cell occurs within the
frame at the ICP cell offset position and should be at the same position
throughout the frame. The ICP offset is programmable on a per-link
basis by
AddTxLink
command.
4.1.2
TRL (TIMING REFERENCE LINK)
Within an IMA group, a TRL should be selected to pass synchroniza-
tion fromthe transmt to the receive end. The TRL can be selected by
ConfigTRLLink
command.
4.1.3
STUFFING MODE
The insertion of stuff cells is to compensate for timng differences
between links within an IMA group.
There are two kinds of stuffing method: CTC (Common Transmt
Clock) mode and ITC (Independent Transmt Clock) mode. The stuffing
method is selected by
ConfigGroupWorkMode
command.
In CTC mode, a stuff cell is added after every 2048 ICP, filler and
ATMlayer cells. The stuff cell is generated by repeating the ICP cell.
Both the ICP cell and the stuff cell are identified as ICP cells via the Link
Stuff Indication (LSI) field of the ICP cell. The stuff cell event will occur
on the same frame on all the links. However, the pre-defined ICP offset
will determne at which cell in the frame the stuff event will occur.
In ITC mode, a stuff cell is added to the TRL the same way as in CTC
mode, that is, it is added after every 2048 ICP, filler and ATMlayer cells.
On all other links in the group, stuff cells are added as necessary to
compensate for timng differences between the TRL and other links of
the group.
In an IMA group, if at least one of the links uses independent clock
pin as its clock input, stuff mode can only be set as ITC. If all the links
within the group use common clock pin (i.e., TSCCK and RSCCK) as
their clock input, stuff mode can be set as either CTC or ITC. For details
about the two clock modes, please refer to
3.2.2 Line Interface Timng
Clock Modes
.
4.1.4
LINK BACKUP
The group link backup function is used to add a link to the group for
backup in case of link failure. This function is only enabled when the
device is working in symmetry mode.
The link to be added to the group is specified as backup link or non-
backup link in ‘AddLink’ command (i.e.,
AddTxLink
and
AddRxLink
commands). Note that only one backup link is supported in each group.
If several links are specified as backup links, only the last added backup
link is regarded as a backup link.
When a link failure event occurred, the IDT82V2608 will automati-
cally pick up a backup link and activate it.
4.2
UNI MODE
ConfigDev
command and
ConfigUNILink
command are used to
configure a UNI link.
ConfigDev
command can be used to configure TC
Work Mode, TC Alpha and Delta value and LCD threshold.
ConfigU-
NILink
command can be used to configure link physical ID, Tx and Rx
Utopia port, line interface Work Mode and clock mode.
When a link is configured in UNI mode, IMA functions are bypassed.
ATMcells are simply transmtted fromthe Utopia interface to the line
interface.
1.
Chapter 4, 5, 6 and 7 are specific to IMAOS08. Details about
IMAOS08_Slave are provided in Chapter 8.
相关PDF资料 |
PDF描述 |
|---|---|
| IDT82V2608 | INVERSE MULTIPLEXING FOR ATM |
| IDT82V3001A | WAN PLL WITH SINGLE REFERENCE INPUT |
| IDT82V3001APV | WAN PLL WITH SINGLE REFERENCE INPUT |
| IDT82V3002A | WAN PLL WITH DUAL REFERENCE INPUTS |
| IDT82V3002APV | WAN PLL WITH DUAL REFERENCE INPUTS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT82V2608BBG | 功能描述:IC INVERSE MUX 8CH ATM 208-BGA RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| IDT82V2616 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:INVERSE MULTIPLEXING FOR ATM |
| IDT82V2616BB | 功能描述:IC INVERSE MUX 16CH ATM 272-PBGA RoHS:否 类别:集成电路 (IC) >> 接口 - 专用 系列:- 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| IDT82V2616BBG | 功能描述:IC INVERSE MUX 16CH ATM 272-PBGA RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| IDT82V3001A | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:WAN PLL WITH SINGLE REFERENCE INPUT |
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