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參數(shù)資料
| 型號： | MT8926AE |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ISO-CMOS ST-BUS⑩ FAMILY T1 Performance Monitoring Adjunct Circuit (PMAC) |
| 中文描述： | 異意法半導(dǎo)體的CMOS總線⑩家庭T1性能監(jiān)控兼任電路（PMAC下） |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 309K |
| 代理商： | MT8926AE |
4-20
MT8926
counter overflows and alarms. Interrupts are reset
via the PMAC Control Word of the CSTi1 control
stream.
T1.403/408 FDL Message Transfer Overview
ANSI standards T1.403 and T1.408 define an ESF
mode Facility Data Link (FDL), which is used to
transport performance information and control
signals across a T1 link. The FDL channel is formed
from the framing bit position of every second frame,
and therefore, has a 4 KBit/sec. bandwidth. See
Table 18 for the ESF Framing Pattern.
Table 18. ESF Frame Pattern
The following two FDL message formats are defined
in T1.403/408:
1)
Bit-oriented, which are repeated 16 bit patterns
or codeword messages, and
2)
Message-oriented performance reports, which
are LAPD protocol messages.
Bit-oriented messages (BOMs) are preemptive, and
therefore, override other FDL communications. Each
FRAME #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FPS
FDL
X
CRC
CB1
X
0
X
CB2
X
0
X
CB3
X
1
X
CB4
X
0
X
CB5
X
1
X
CB6
X
1
message consists of a 16 bit codeword of the form
11111111 0XXXXXX0. Therefore, there are 64 unique
codewords or messages defined by XXXXXX. Refer
to T1.403 or T1.408 for a list of messages and
message restrictions.
BOMs are further divided into priority messages, and
command
and
response
messages indicate the existence of a service-
affecting failure, and are repeated until the condition
that caused the message is removed. These BOMs
are transmitted for at least one second, but may be
interrupted as often as once per second, for a
maximum of 100 msec. This is to accommodate the
periodic
transmission
performance reports.
messages.
Priority
of
message-oriented
Command and response messages are used to
perform various functions, which include the
following:
1)
line and payload loopback control,
2)
protection switch control,
3)
synchronization control,
4)
reserved for network use, and
5)
unassigned.
Each message consists of a 16 bit codeword of the
form 11111111 0XXXXXX0, which is repeated at least
10 times.
The LAPD message-oriented performance reports
are sent across the FDL once per second using the
bit-assigned message structure of Figure 10. Each
report contains performance data for each second of
the previous four seconds.
When data for the next one second interval t
0+1
is
gathered, it will take the place of t
0
data of the last
message. The t
0
data will move to the t
0-1
position,
the t
0-1
data will move to the t
0-2
position, the t
0-2
data will move to the t
0-3
position, and the data of t
0-
3
will be discarded. Refer to T1.403 or T1.408 for a
more complete definition of this protocol.
User
Maintenance
terminal-to-terminal communications may also pass
over the FDL.
defined
Operations,
(OA&M),
Administration
terminal-to-network
and
and
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8926AP | ISO-CMOS ST-BUS⑩ FAMILY T1 Performance Monitoring Adjunct Circuit (PMAC) |
| MT8930B | Subscriber Network Interface Circuit |
| MT8930BC | Subscriber Network Interface Circuit |
| MT8930BE | Subscriber Network Interface Circuit |
| MT8930BP | Subscriber Network Interface Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8926AP | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY T1 Performance Monitoring Adjunct Circuit (PMAC) |
| MT8930 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS⑩ FAMILY Subscriber Network Interface Circuit Preliminary Information |
| MT8930B | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Network Interface Circuit |
| MT8930BC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Network Interface Circuit |
| MT8930BE | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Network Interface Circuit |
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