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參數(shù)資料
| 型號： | PEB80900H |
| 英文描述： | ?Network Termination Controller? |
| 中文描述： | ？網(wǎng)絡(luò)終端控制器？ |
| 文件頁數(shù)： | 125/181頁 |
| 文件大小： | 3288K |
| 代理商： | PEB80900H |
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PEB 80900
Part II
’
IEC-T
’
: Operational Description
Data Sheet
113
2001-04-02
The IOM
interfaces and the UK0 interfaces are defined to prohibit states which cannot
be left with normal commands and infos. Deactivation of the line leads all devices to
defined states. Nevertheless, it is recommended to implement a power-on reset (at pin
RESQ of NTC-T AM with IEC-T functionality selected) to start in a defined manner, and
to shorten the first deactivation and activation.
The usage of the two input pins, RESQ and TSP, has the same effect as inputs RES and
SSP in the C/I channel with one exception: If RESQ pin is low, DISS pin is set to high. If
the reset is given only in the C/I channel, DISS pin is set to low. They always overwrite
the IOM
C/I channel input.
For instance, the PEB 2080 (SBC) sends an EI code in the C/I channel, if RESET and
TM2 pins of the SBC are set. The NTC-T AM with IEC-T functionality selected might
interpret the EI code as the TEST command, but the SBC and NTC-T AM with IEC-T
functionality selected reset pins (active low) are connected together in the NT. Thus, the
NTC-T AM with IEC-T functionality selected ignores the EI code performing the reset
request.
7.2
Activation and Deactivation of Uk0 Transmission Lines
On Uk0, the exchange of control information is partially state oriented. Some signal
elements are given as long as no other information has to be transferred, other signal
elements have distinct durations.
7.2.1
Awake Protocol
To awake the Uk0 interface and the Idle modules, an awake and an acknowledge signal
have been defined.
Procedure for awaking NTC-T AM with IEC-T functionality selected
After sending the awake signal, the awaking device waits for the acknowledge. After 12
ms in the LT mode or 6 ms in the NT mode, the awake signal is repeated, if no
acknowledge has been recognized.
If an acknowledge signal has been recognized, the NTC-T AM with IEC-T functionality
selected waits for its possible repetition (in case of previous coincidence of two awake
signals). If no repetition was detected, the NTC-T AM with IEC-T functionality selected
starts transmitting INFO U2 in the LT mode, INFO U2A in the LT-RP mode and INFO
U1A in NT modes with a delay of 7 ms in the LT mode or 13 ms in the NT mode.
If such a repetition is detected, the NTC-T AM with IEC-T functionality selected interprets
it as an awake signal and the NTC-T AM with IEC-T functionality selected behaves like
a device awoken by the far end.
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