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参数资料
| 型号： | PEF80902 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | 4B3T Second Gen. Modular ISDN NT(Ordinary) |
| 中文描述： | 4B3T二将军模块化综合业务数字网新台币（普通） |
| 文件页数： | 50/83页 |
| 文件大小： | 1168K |
| 代理商： | PEF80902 |
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PEF 80902
Operational Description
Data Sheet
42
2001-11-12
3
Operational Description
3.1
Layer 1 Activation/Deactivation
3.1.1
Generation of 4B3T Signal Elements
For control and monitoring purposes of the activation/deactivation progress the following
signal elements are defined by TS 102 080 and FTZ 1 TR 220.
Table 17
4B3T Signal Elements
U0
No signal or deactivation signal that is used in both directions.
Downstream, it requests the NT to deactivate. Upstream, the NT
acknowledges by U0 that it is deactivated.
U1W, U2W Awake or awake acknowledge signal used in the awake procedure of the
U-interface.
U2
The LT sends U2 to enable the own echo canceller to adapt the
coefficients. By the Barker code the NT at the other end is enabled to
synchronize. The detection of U2 is used by the NT as a criterion for
synchronization.
The M-channel on U may be used to transfer loop commands.
U2A
While the NT-RP is synchronizing on the received signal, the LT-RP sends
out U2A to enable its echo canceller to adapt the coefficients, but sending
no Barker code it inhibits the NT to synchronize on the still asynchronous
signal.
Due to proceeding synchronization, the U-frame may jump from time to
time. U2A can not be detected in the NT at the far end.
U1A
U1A is similar to U1 but without framing information. While the NT
synchronizes on the received signal, it sends out U1A to enable its echo
canceller to adapt its coefficients, but sends no Barker code to prevent the
LT from synchronizing on the still asynchronous signal. Due to proceeding
synchronization, the U-frame may jump from time to time. U1A can not be
detected by the far-end LT.
U1
When synchronized, the NT sends the Barker code and the LT may
synchronize itself. U1 indicates additionally that a terminal equipment has
not yet activated. Upon receiving U1 the LT indicates the synchronized
state by C/I
’
UAI
’
to layer-2.
Usually during activation, no U1 signal is detected in the LT because the
TE is activated first and U1 changes to U3 before being detected.
The M-channel on U may be used to transfer code error indications and 1
kbit/s transparent data.
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相关代理商/技术参数 |
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| PEF80902HV1.1 | 功能描述:网络控制器与处理器 IC ISDN RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| PEF80902HV1.1TR | 制造商:Lantiq 功能描述: |
| PEF80902HV11XP | 制造商:Lantiq 功能描述:ISDN CTLR S/T/U 192Kbps 3.3V 44-Pin MQFP Tray |
| PEF8091(64MQFP) | 制造商:未知厂家 制造商全称:未知厂家 功能描述:ISDN Line Interface |
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