參數(shù)資料
型號： PSB7110
廠商： SIEMENS AG
英文描述： Enhanced ISDN Data Access Controller ISAR
中文描述： 增強(qiáng)綜合業(yè)務(wù)數(shù)字網(wǎng)的數(shù)據(jù)接入控制器專家組
文件頁數(shù)： 31/164頁
文件大?。?/td> 1173K
代理商： PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 31
In transmit direction, the V.110 frame is combined with SART data and the state of E-, X- and S-bits. Transmission of
the last data byte in the mailbox is indicated to the host (buffer empty condition), which may set control bits.
Flow control by means of the X-bits is supported, which means that data transfer to the SART unit is stopped if
indicated by the remote side.
In receive direction, frame synchronization is monitored while the number of frames for synchronisation (normally 1)
is programmable. The D-bits are forwarded to the SART and E-, X- and S- bits are forwarded to the host as status
events any time they change their state.
Status conditions of the remote DTE can be detected and indicated to the host.
2.4.5
DTMF
DTMF mode allows transparent data transfer between SART unit and data pump while a DTMF detector is active,
which indicates received DTMF tones to the host.
A programmable feature is the signal rejection level below which a DTMF tone will not be detected by the pump.
2.4.6
DTMF Transmission
In transmit direction, a DTMF tone can be programmed which is output on the timeslot.
In this mode no data is transfered between SART unit and IOM-2 interface. However, during normal operation
(DTMF mode) the pump only needs to be configured to DTMF transmission for the duration of the transmitted DTMF
digit, right after that the pump can be reconfigured to normal operation mode.
The transmitter output attenuation is programmable.
2.4.7
Bypass Mode
The bypass mode allows the transfer of SART data without additional treatment.
In transmit direction, the data from the SART it transfered to the IOM timeslot. Octet data (binary mode) can be octet
aligned to the IOM-2 timeslot if programmed (8-bit timeslot length).
In receive direction, the data from the IOM-2 timeslot is directly transfered to the SART.
2.5
IOM-2 Configuration
The IOM-2 configurations are separate for each datapath. Via datapath 1 and 2, any timeslot for the output of pump
data can be selected.
The following programmable functions are available for each datapath :
Start of timeslot
Length of timeslot (8 or 16 bit)
Switching of DU/DD lines
Coding (A-law,
μ
-law or 16-bit linear)
It must be noted that the programmed timeslots for both datapaths must not overlap.
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