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参数资料
| 型号： | PEF2080 |
| 厂商： | SIEMENS AG |
| 英文描述： | S/T Bus Interface Circuit(SBC) |
| 中文描述： | S / T的总线接口电路（SBC）的 |
| 文件页数： | 14/74页 |
| 文件大小： | 2620K |
| 代理商： | PEF2080 |
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Semiconductor Group
15
2
Functional Description
The S-bus interface circuit PEx 2080 performs the layer-1 functions for the S/T interface of the ISDN
basic access.
2.1
General Functions and Device Architecture
The common functions for all operating modes are:
G
Iine transceiver functions for the S interface according to the electrical specifications of
CCITT I.430;
G
dynamically adaptive threshold control for the receiver;
G
conversion of the frame structure between IOM and S interfaces;
G
conversion from/to binary to/from pseudo-ternary code.
Mode specific functions are:
G
receive timing recovery;
G
S-timing generation using IOM timing synchronous to system, or vice versa;
G
D-channel access control and priority handling;
G
D-channel echo bit generation;
G
activation/deactivation procedures, triggered by primitives received over the IOM interface or by
INFO’s received from the line;
G
frame alignment according to CCITT Q.503;
G
execution of test loops.
Analog Functions
The full-bauded pseudo-ternary pulse shaping is achieved with the integrated transmitter which is
realized as a current limited voltage source. A voltage of 2.1 V is delivered between SX1-SX2,
which yields a current of 7.5 mA over 280
.
The receiver is designed as a threshold detector with adaptively switched threshold levels. Pin SR1
delivers 2.5 V as an output, which is the virtual ground of the input signal on pin SR2.
An external transformer of ratio 2:1 is needed in both receive and transmit direction to provide for
isolation and transform voltage levels according to CCITT recommendations.
Functional Description
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PEF2080-N | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:S/T Bus Interface Circuit(SBC) |
| PEF2091 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:ICs for Communications(ISDN Echocancellation Circuit) |
| PEF2091F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:?ISDN Echocancellation Circuit - 2B1Q Code? |
| PEF2091FV5.3 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:ICs for Communications(ISDN Echocancellation Circuit) |
| PEF2091HV5.3 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:ICs for Communications(ISDN Echocancellation Circuit) |
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