參數(shù)資料
型號： MT9076
廠商： Mitel Networks Corporation
英文描述： T1/E1/J1 3.3V Single Chip Transceiver(T1/E1/J1 3.3V 單片收發(fā)器)
中文描述： T1/E1/J1收發(fā)3.3V的單芯片收發(fā)器（T1/E1/J1收發(fā)3.3單片收發(fā)器）
文件頁數(shù)： 32/162頁
文件大?。?/td> 427K
代理商： MT9076
MT9076
Preliminary Information
28
3.3.1
Time slot 0 of every basic frame is reserved for basic frame alignment and contains either a Frame Alignment
Signal (FAS) or a Non-Frame Alignment Signal (NFAS). FAS and NFAS occur in time slot zero of consecutive
basic frames as shown in Table 12. Bit two is used to distinguish between FAS (bit two = 0) and NFAS (bit two
= 1).
Basic Frame Alignment
Basic frame alignment is initiated by a search for the bit sequence 0011011 which appears in the last seven bit
positions of the FAS, see the Frame Algorithm section. Bit position one of the FAS can be either a CRC-4
remainder bit or an international usage bit.
Bits four to eight of the NFAS (i.e., S
a4
- S
a8
) are additional spare bits which may be used as follows:
S
a4
to S
a8
may be used in specific point-to-point applications (e.g. transcoder equipments conforming to
G.761)
S
a4
may be used as a message-based data link for operations, maintenance and performance
monitoring
S
a5
to S
a8
are for national usage
A maintenance channel or data link at 4,8,12,16,or 20 kHz for selected S
a
bits is provided by the MT9076 in E1
mode to implement these functions. Note that for simplicity all S
a
bits including S
a4
are collectively called
national bits throughout this document.
Bit three (designated as “A”), the Remote Alarm Indication (RAI), is used to indicate the near end basic frame
synchronization status to the far end of a link. Under normal operation, the A (RAI) bit should be set to 0, while
in alarm condition, it is set to 1.
Bit position one of the NFAS can be either a CRC-4 multiframe alignment signal, an E-bit or an international
usage bit. Refer to an approvals laboratory and national standards bodies for specific requirements.
Table 11 - FAS and NFAS Structure
CRC
CRC
Frame/Type
PCM 30 Channel Zero
1
2
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
3
0
A
0
A
0
A
0
A
0
A
0
A
0
A
0
A
4
1
5
1
6
0
7
1
8
1
S
0/FAS
1/NFAS
2/FAS
3/NFAS
4/FAS
5/NFAS
6/FAS
7/NFAS
8/FAS
9/NFAS
10/FAS
11/NFAS
12/FAS
13/NFAS
14/FAS
15/NFAS
C
1
0
C
2
0
C
3
1
C
4
0
C
1
1
C
2
1
C
3
E
1
C
4
E
2
S
a4
1
S
a4
1
S
a4
1
S
a4
1
S
a4
1
S
a4
1
S
a4
1
S
a4
S
a5
1
S
a5
1
S
a5
1
S
a5
1
S
a5
1
S
a5
1
S
a5
1
S
a5
S
a6
0
S
a6
0
S
a6
0
S
a6
0
S
a6
0
S
a6
0
S
a6
0
S
a6
S
a7
1
S
a7
1
S
a7
1
S
a7
1
S
a7
1
S
a7
1
S
a7
1
S
a7
S
a8
1
S
a8
1
S
a8
1
S
a8
1
S
a8
1
S
a8
1
S
a8
1
S
a8
indicates position of CRC-4 multiframe alignment signa
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相關代理商/技術參數(shù)
參數(shù)描述
MT9076AB 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:T1/E1/J1 3.3V Single Chip Transceiver
MT9076AP 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:T1/E1/J1 3.3V Single Chip Transceiver
MT9076B 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1/J1 3.3 V Single Chip Transceiver
MT9076BB 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1/J1/T1 3.3V 80LQFP - Trays
MT9076BB1 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1/J1/T1 3.3V 80LQFP - Trays
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