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: 22/83页
文件大小: 1168K
代理商: PEF80902
PEF 80902
Functional Description
Data Sheet
14
2001-11-12
2.2
IOM
-2 Interface
The IOM -2 interface always operates in NT mode according to the IOM -2 Reference
Guide [12].
2.2.1
IOM -2 Functional Description
The IOM -2 interface consists of four lines: FSC, DCL, DD, DU. The rising edge of FSC
indicates the start of an IOM -2 frame. The DCL clock signal synchronizes the data
transfer on both data lines DU and DD. The DCL is twice the bit rate. The bits are shifted
out with the rising edge of the first DCL clock cycle.
Note: It is not possible to write any data via IOM -2 into the T-SMINT O.
The IOM -2 interface can be enabled/disabled with pin DIO.
The FSC signal is an 8 kHz frame sync signal. The number of PCM timeslots on the
transmit line is determined by the frequency of the DCL clock , with the 512 kHz clock 1
channel consisting of 4 timeslots is available.
IOM
-2 Frame Structure of the T-SMINT O
The frame structure on the IOM -2 data ports (DU,DD) of the T-SMINT O with a DCL
clock of 512 kHz is shown in
Figure 4
.
Figure 4
IOM
-2 Frame Structure of the T-SMINT O
The frame is composed of one channel:
Channel 0 contains 144-kbit/s of user and signaling data (2B + D), a MONITOR
programming channel (not available in T-SMINT O) and a command/indication
channel (CI0) for control of e.g. the U-transceiver.
macro_19_QSMINTO
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