參數(shù)資料
型號(hào): 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(shè)備(基于通訊總線的系統(tǒng)與ATM網(wǎng)絡(luò)的接口))
中文描述: 多通道自動(dòng)柜員機(jī)AAL1特區(qū)(多通道自動(dòng)柜員機(jī)AAL1分段及重組設(shè)備(基于通訊總線的系統(tǒng)與空中交通管理網(wǎng)絡(luò)的接口))
文件頁數(shù): 153/159頁
文件大?。?/td> 514K
代理商: MT90500
MT90500
153
The above maximum requirement defines the theoretical minimum clock frequency the design must achieve to
support 1024 X 64 kbps bidirectional channels with 1024 VCs. Assuming a 29% margin for CPU accesses,
AAL0 cell processing, and random lost memory access efficiency, the MT90500 should be supplied with a
master clock (MCLK) of 60 MHz to support 1024 X 64 kbps bidirectional channels with 1024 VCs. It is also
recommended to select SSRAM to minimize turnaround cycles, for the greatest memory efficiency.
7.5
CBR Throughput Delay
Delay through the MT90500, from TDM bus to TDM bus, depends on a number of variables, not all of which are
under the control of the designer. The following discussion omits ATM network delay (transmission delay), TDM
switching delay (caused by moving a TDM channel from time slot 0 to time slot 32, for instance) and CDV buffer
delay (Avg. Lead of the RX Circular Buffer). An example of large delay would use AAL1, N=1, fully-filled cells,
the delay for which can be typically 66 frames (8.25 msec). This is due to the following factors:
4
3
47
8
4
----
66
frames TX TDM Input Frame Buffer
frames average TX offset (TDM Write Pointer to TX_SAR Read Pointer)
frames cell assembly (47 byte payload)
frames RX Circular Buffer delay (Avg. Lead = 02h, = 8 frames)
frames RX TDM Output Frame Buffer.
frames
Minimum delay is achieved using larger trunking numbers (N > 47) or using partially filled cells with N = partial-
fill- level. Delay in this case will be 3 msec to 5 msec, with CDV buffers set to the minimum.
To these numbers, the designer may wish to add the application-specific delays: ATM network transmission
delay, ATM switching delay, CDV buffer delay, and TDM switching delay.
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(shè)備(基于通訊總線的系統(tǒng)與ATM網(wǎng)絡(luò)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: