- 您现在的位置：买卖IC网 > PDF目录378049 > PEF80902 (INFINEON TECHNOLOGIES AG) 4B3T Second Gen. Modular ISDN NT(Ordinary) PDF资料下载
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： | 57/83页 |
| 文件大小： | 1168K |
| 代理商： | PEF80902 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页当前第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页
PEF 80902
Operational Description
Data Sheet
49
2001-11-12
3.2
Layer 1 Loopbacks
Test loopbacks are specified by the national PTTs in order to facilitate the location of
defect systems. Four different loopbacks are defined. The position of each loopback is
illustrated in
Figure 17
.
Figure 17
Test Loopbacks
Loopbacks #1, #1A and #2 are controlled by the exchange. Loopback #3 is controlled
locally on the remote side. All four loopback types are transparent. This means all bits
that are looped back will also be passed onwards in the normal manner. Only the data
looped back internally is processed; signals on the receive pins are ignored. The
propagation delay of actually looped B and D channels data must be identical in all
loopbacks.
3.2.1
Loopback No.2
The following loopback type belongs to the loopback-#2 category:
complete loopback (B1,B2,D), in a downstream device
Normally loopback #2 is controlled by the exchange. The maintenance channel is used
for this purpose.
3.2.1.1
Complete Loopback
When receiving the request for a complete loopback, the U transceiver passes it on to
the S-bus transceiver. This is achieved by issuing the C/I-code AIL in the
“
Transparent
”
state or C/I = ARL in states different than
“
Transparent
”
IOM
-2
PBX or TE
U-Transceiver
IOM
-2
IOM
-2
IOM
-2
U-Transceiver
U-Transceiver
U-Transceiver
U-Transceiver
U-Transceiver
Loop 2
Loop 3
Loop 2
Loop 1 A
Loop 2
Loop 1
S-BUS
NT
U
U
Repeater
(optional)
S-Transceiver
Layer-1 Controller
Layer-1 Controller
IOM-2
Exchange
loop_2b1q.emf
相关PDF资料 |
PDF描述 |
|---|---|
| PF4610F | Double Ended Mold Type Phototransistors |
| PF4650F | Double Ended Mold Type Phototransistors |
| PGA103(中文) | Programmable Gain Amplifier(可编程增益放大器) |
| PGA309(中文) | VOLTAGE OUTPUT PROGRAMMABLE SENSOR CONDITIONER(电压输出可编程传感器调节器) |
| PGA309EVM | PGA309 Evaluation Module(PGA309评估模块) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| PEF8091(64TQFP) | 制造商:未知厂家 制造商全称:未知厂家 功能描述:ISDN Line Interface |
发布紧急采购，3分钟左右您将得到回复。