參數資料
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與ATM網絡的接口）)
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與空中交通管理網絡的接口））
文件頁數： 43/159頁
文件大?。?/td> 514K
代理商： MT90500
MT90500
43
n =1; and over partially-filled cells (where n is less than, or equal to, the payload size). The cell parameters are
configured through the microprocessor port. Figure 12 gives examples of the ATM AAL1 cell formats.
The MT90500 meets the ITU I.363.1 standard for SDT for 1 to 96 octets per structure (1 to 96 TDM channels
per VC). The MT90500 meets the ANSI.630 standard for SDT for 1 to 122 octets per structure (1 to 122 TDM
channels per VC).
TDM traffic over AAL0 is also supported (referred to in this document as CBR-AAL0). AAL0 is the “bare” or
“null” adaptation layer (5 bytes of header plus 48 bytes of direct user payload). Figure 13 shows CBR-AAL0
and AAL1 partially-filled cell formats. In addition, TDM traffic over AAL5 can also be transmitted (referred to in
this document as CBR-AAL5). The cell format for CBR-AAL5 is shown in Figure 14.
The AAL1 cell differs from the CBR-AAL0 cell in that it contains an AAL1 byte, and it may also contain a pointer
byte. The AAL1 byte contains a sequence count (0 to 7), a CSI bit and the SNP (Sequence Number Protection)
field. The sequence count is used to identify cell ordering, and to aid in the detection of lost cells. The CSI bit
indicates the presence (CSI = 1) or absence (CSI = 0) of a pointer byte in even-numbered cells. In odd-
numbered cells, the CSI bits serve to carry the SRTS nibble. The pointer byte indicates the start of the next
structure (since structures may be shorter or longer than 47 bytes, and therefore move through the AAL1
payload). Also worth noting is the high-order bit of the header’s PTI field, which can be set to indicate an OAM
cell (a cell whose payload contains signalling rather than TDM data).
The CBR-AAL5 cell differs from AAL1 and CBR-AAL0 in that its TDM payload is 40 bytes (where TDM data can
occupy 8, 16, 24, 32, or 40 payload bytes), and the remaining 8 bytes are devoted to AAL5 overhead. Every cell
in a CBR-AAL5 VC is an end-of-frame cell, as identified by the LSB of the PTI field in the cell header being set.
In addition, each cell contains a CPCS-UU byte and a CPI byte (both unused here), two length bytes and four
CRC bytes (all inserted by the MT90500). The MT90500 supports TDM trunking over AAL5, for n = 1, 8, 16, 24,
32, or 40. For n = 1, the MT90500 meets the cell format in the ATM Forum standard AF-VTOA-0083.000.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Even
Parity
VCI
CLP
Partially-Filled AAL1 Cell
< 47 Payload Bytes
Figure 13 - Partially-Filled AAL1 and CBR-AAL0 Cell Formats
PTI
VCI
VPI
VCI
GFC / VPI
VPI
HEC
Sequence
Count
CSI
CRC
field
Payload Byte #1
Payload Byte #2
Pad Byte or Payload Byte #46
VCI
CLP
CBR-AAL0 Cell
1 - 48 Payload Bytes
PTI
VCI
VPI
VCI
GFC / VPI
VPI
HEC
Payload Byte #1
Payload Byte #2
Pad Byte or Payload Byte #47
Pad Byte or Payload Byte #48
Payload Byte #3
Payload Byte #3
Payload Byte #4
Pad Byte
相關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與ATM網絡的接口）)
MT90732AP Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
MT90732 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
相關代理商/技術參數
參數描述
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:
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