參數(shù)資料
型號： MT90500
廠商： Mitel Networks Corporation
英文描述： Multi-Channel ATM AAL1 SAR
中文描述： 多通道自動柜員機AAL1特區(qū)
文件頁數(shù)： 13/159頁
文件大?。?/td> 514K
代理商： MT90500
MT90500
13
1.3
ATM Glossary
AAL -
ATM Adaptation Layer; standardized protocols used to translate higher layer services from multiple
applications into the size and format of an ATM cell.
AAL0
- native ATM cell transmission; proprietary protocol featuring 5-byte header and 48-byte user payload.
AAL1 - ATM Adaptation Layer
used for the transport of constant bit rate, time-dependent traffic (e.g. voice,
video); requires transfer of timing information between source and destination; maximum of 47-bytes of user
data permitted in payload as an additional header byte is required to provide sequencing information.
AAL5
-
ATM Adaptation Layer
usually used for the transport of variable bit rate, delay-tolerant data traffic and
signalling which requires little sequencing or error-detection support
.
ANSI T1.630
- American National Standards Institute specification: Broadband ISDN - ATM Adaptation Layer
for Constant Bit Rate Services Functionality and Specification.
Asynchronous
- 1. Not
synchronous
; not periodic. 2. The temporal property of being sourced from
independent timing references. Asynchronous signals have different frequencies, and no fixed phase
relationship. 3. In telecom, data which is not synchronized to the public network clock. 4. The condition or state
when an entity is unable to determine, prior to its occurrence, exactly when an event will transpire.
ATM
- Asynchronous Transfer Mode; a method in which information to be transferred is organized into fixed-
length cells; asynchronous in the sense that the recurrence of cells containing information from an individual
user is not necessarily periodic. (While ATM cells are transmitted synchronously to maintain clock between
sender and receiver, the sender transmits data cells when it has something to send and transmits empty cells
when idle, and is not limited to transmitting data every Nth cell.)
Cell
- fixed-size information package consisting of 53 bytes (octets) of data; of these, 5 bytes represent the cell
header and 48 bytes carry the user payload and required overhead.
CBR
- Constant Bit Rate; an ATM service category supporting a constant or guaranteed rate, with timing
control and strict performance parameters. Used for services such as voice, video, or circuit emulation.
CDV
- Cell Delay Variation; a
QoS
parameter that measures the peak-to-peak cell delay through the network;
results from buffering and cell scheduling.
CES
- Circuit Emulation Service; ATM Forum service providing a virtual circuit which emulates the
characteristics of a constant bit rate, dedicated-bandwidth circuit (e.g. T1).
CLP
- Cell Loss Priority; a 1-bit field in the ATM cell header that corresponds to the loss priority of a cell; cells
with CLP = 1 can be discarded in a congestion situation.
CSI
- Convergence Sublayer Indication bit in the AAL1 header byte; when present in an even-numbered cell
using
SDT
, indicates the presence of a pointer byte; used to transport
RTS
values in odd-numbered cells using
SRTS
for clock recovery.
GFC
- Generic Flow Control; 4-bit field in the ATM header used for local functions (not carried end-to-end);
default value is “0000”, meaning that GFC protocol is not enforced.
HEC
- Header Error Control; using the fifth octet in the ATM cell header, ATM equipment (usually the
PHY
) may
check for an error and correct the contents of the header; CRC algorithm allows for single-error correction and
multiple-error detection.
I.363
- ITU-T Recommendation specifying the AALs for B-ISDN (Broadband ISDN).
Isochronous
- The temporal property of an event or signal recurring at known periodic time intervals (e.g. 125
μ
s). Isochronous signals are dependent on some uniform timing, or carry their own timing information
embedded as part of the signal. Examples are DS-1/T1, E1 and TDM in general. From the root words, “iso”
meaning equal, and “chronous” meaning time.
OAM bit
- Operations, Administration and Maintenance; MSB within the
PTI
field of the ATM cell header which
indicates if the ATM cell carries management information such as fault indications.
Plesiochronous
- The temporal property of being arbitrarily close in frequency to some defined precision.
Plesiochronous signals occur at nominally the same rate, any variation in rate being constrained within specific
limits. Since they are not identical, over the long term they will be skewed from each other. This will force a
相關(guān)PDF資料
PDF描述
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
MT90733 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:
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