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| 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)： | 151/181頁 |
| 文件大?。?/td> | 3288K |
| 代理商： | PEB80900H |
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PEB 80900
Part II
’
IEC-T
’
: Operational Description
Data Sheet
139
2001-04-02
If it receives 8 subsequent M symbols with zero polarity, in each NT mode the NTC-T AM
with IEC-T functionality selected sends ARN for ARD and AIN for AID in the state
diagram.
If it receives 8 subsequent M symbols with plus polarity, in NT, NT-TE and NT-PABX
modes the NTC-T AM with IEC-T functionality selected gives out AR2 for ARD and AIL
for AID in the state diagram.
If it receives 8 subsequent M symbols with alternating plus and zero polarity, in NT-RP
mode the NTC-T AM with IEC-T functionality selected gives out AR2 for ARD and AlL for
AID in the state diagram.
7.5.3
Description of the Activation/Deactivation States of
NTC-T AM
with IEC-T Functionality Selected
In this section, each state is described with its outputs and its meaning. Unless described
otherwise, the activation controller performs the following actions:
No RESET of the NTC-T AM with IEC-T functionality selected.
DISS pin is low.
The adaption of receiver coefficients is disabled.
The RDS counter of frames with code violations is reset and disabled.
The received user data is given transparently to the IOM
interface.
The NTC-T AM with IEC-T functionality selected is in power-up.
The C/I channel output and the transmitted Uk0 INFO are already specified by the state
diagrams; below they are only referred to, if within a state there are more than one of
them specified. In this case, the C/I channel output and the transmitted Uk0 INFO
depend on the given inputs.
Ack. sent/received
If awaking, the NTC-T AM with IEC-T functionality selected has
received the acknowledge signal. If being awoken the IEC has
sent the acknowledge. Anyway, the NTC-T AM with IEC-T
functionality selected waits for possible repetition or timeout.
The user data (B+B+D) on pin DOUT is clamped to high to avoid
undesired false data in the D channel during activation.
The NTC-T AM with IEC-T functionality selected is awaking the
Uk0 interface and waits for the acknowledge or for the timeout
after sending the awake signal. The user data (B+B+D) on pin
DOUT is clamped to high (except repeater modes).
The NTC-T AM with IEC-T functionality selected has received
INFO U0, indicates this to the upstream unit and waits for DID,
the permission to power down. The user data (B+B+D) on pin
DOUT is clamped to high (except repeater modes).
Awake signal sent
Deac. acknowledged
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