參數(shù)資料
型號(hào)： MT90221
廠商： Mitel Networks Corporation
英文描述： Quad IMA/UNI PHY Device(四端口 IMA/UNI 物理層設(shè)備（四端口ATM IMA和UNI處理器）)
中文描述： 四IMA的/單向物理層設(shè)備（IMA的四端口/單向物理層設(shè)備（四端口自動(dòng)柜員機(jī)IMA的和單向處理器））
文件頁(yè)數(shù)： 111/116頁(yè)
文件大?。?/td> 309K
代理商： MT90221
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MT90221
103
length cells; asynchronous in the sense that the
recurrence of cells containing information from an
individual user is not necessarily periodic.
Note: Although ATM cells are transmitted synchronously to main-
tain the clock between sender and receiver, the sender transmits
data cells on an as available basis and transmits empty cells when
idle. The sender is not limited to transmitting data every Nth cell.
Blocked
- The Blocked State is a Group State
indicating that the Group has been inhibited.
Blocking
- Blocking is a transitional state that allows
graceful transition into the
Unusable State
without
loss of ATM layer cells.
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.
Cell Delay Variation (CDV
) - a QoS parameter that
measures the peak-to-peak cell delay through the
network; results from buffering and cell scheduling.
Common Transmit Clock (CTC) Configuration
-
This is a configuration where the transmit clocks of
all links within the IMA group are derived from the
same clock source.
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.
Filler Cell
- A Filler Cell is used to fill in the IMA
frame when no cells are available at the ATM layer. It
is used for performing cell rate decoupling at the IMA
sublayer (e.g., similar to the Idle Cell used in single
link interfaces).
Header Error Control (HEC)
- ATM equipment
(usually the PHY) uses the fifth octet in the ATM cell
header to 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.
IMA Frame
- The IMA Frame is used as the unit of
control in the IMA protocol. It is defined as M
consecutive cells, on each of N links, where 1
≤
N
≤
32 (determined by the UM and IMA link start-up
procedure), in an IMA Group. One of the M cells on
each of the N links is an ICP cell that occurs within
the frame at the ICP cell offset position. This offset
position may be different between links. The IMA
Frame is
Aligned
on all links. Differential link delay
can cause the reception to be ‘mis-aligned‘ in time.
Alignment can be recovered using a link delay
synchronization
mechanism.
mechanism is a controlled violation of the IMA
consecutive frame definition.
The
ICP
‘Stuff‘
IMA Group
- The IMA Group is a ‘group‘ of links at
one end of a ’circuit’ that establish an IMA virtual link
to another end.
IMA Sublayer
- The IMA Sublayer is part of the
Physical Layer that is located between the interface
specific Transmission Convergence Sublayer and the
ATM Layer.
IMA Virtual Link
- The IMA Virtual Link is a virtual
circuit established between two IMA ends over a
number of Physical Links (i.e., IMA Group).
Inhibiting
- Inhibiting is a voluntary action that
disables the capacity of a group or link to carry ATM
Layer cells for reasons other than reported problems.
Insufficient Links
- This is a Group State indicating
that the group does not have sufficient links to be in
the
Operational
State.
Independent Transmit Clock (ITC) Configuration
-
This is a configuration where the transmit clock of at
least one link within the IMA Group is not derived
from a common clock source.
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 and E1. From the root words,
“iso” meaning equal, and “chronous” meaning time.
ITU-T
- International Telecommunications Union
Telecommunications Standards Sector.
Layer Management Functions
- The Layer
Management Functions relate to processing of
actions such as configuration, fault monitoring and
performance monitoring within the group.
Loss of Cell Delineation (LCD)
- The LCD defect is
reported when the OCD anomaly persists for the
period of time specified in ITU-T Recommendation
I.432(30). The LCD defect is cleared when the OCD
anomaly has not been detected for the period of time
specified in ITU-T Recommendation I.432.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT90221AL 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Quad IMA/UNI PHY Device
MT90222 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:4/8/16 Port IMA/TC PHY Device
MT90222AG 制造商:Microsemi Corporation 功能描述:ATM IMA 40MBPS 2.5V 384BGA - Trays
MT90222AG2 制造商:Microsemi Corporation 功能描述:ATM IMA 40MBPS 2.5V 384BGA /BAKE/DRYPACK - Trays
MT90223AG 制造商:Microsemi Corporation 功能描述:ATM IMA 80MBPS 2.5V 384BGA - Trays
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