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參數(shù)資料
| 型號(hào)： | PEB80900F |
| 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)： | 121/181頁 |
| 文件大?。?/td> | 3288K |
| 代理商： | PEB80900F |
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PEB 80900
Part II
’
IEC-T
’
: Functional Description
Data Sheet
109
2001-04-02
6.7.3
A 1 kHz transparent channel is provided via the T bit on the IOM
-1 interface in both
directions. Every 8th T bit is transmitted via the Uk0 M channel. A low in the T bit causes
the M symbol to be set to minus polarity, overwriting any loop 4, loop 2 requests or RDS
errors that might be transmitted via Uk0. A high in the T bit causes the M symbol to be
set to zero or plus polarity depending on any loop 4, loop 2 requests or RDS errors. So
it is obvious, that during activation it is essential to keep the T bit high to enable the NT
(NT-RP) to recognize the loop status.
Each received M symbol with zero or plus polarity causes 8 consecutive T bits set to
high. Each received M symbol with minus polarity causes 8 consecutive T bits set to low.
Transparent Maintenance Channel
6.7.4
Interfaces to the Power Supply Circuit
The two-wire interface Uk0 provides power for the equipment repeater, network
termination (NT) and possibly one telephone terminal in emergency conditions, when
they must be fed by the exchange in the ISDN basic access. The NTC-T AM with IEC-T
functionality selected has an interface to the power supply/feeding circuit of the
exchange.
6.7.4.1
Scanning of Measured Values (MPF)
Using the common clocks 8 kHz and 512 or 4096 kHz, the feeding circuit transmits
serially an octet via the MPF pin into the NTC-T AM with IEC-T functionality selected at
the beginning of each IOM
-frame, which represents the measured loop feeding current.
As shown in fig. 5.4, fig. 5.5 and fig. 5.7 , the data at pin MPF are defined with equivalent
timing and therefore are clocked in at the same instants as the data an DIN pin. The octet
passed by the feeding circuit is identically placed as octet B1, the first of each frame both
in 256 kHz and 2048 kHz modes.
If not used, the MPF pin may be clamped either to VDD or GND.
6.7.4.2
Supervision of Power Feed (LT Mode)
For supervision of power feed control, lines DISS, APF, CLS are used in static, level
sensed operation mode.
In the C/I channel, a command LTD (LT disable, see
Chapter 7.3.3
) is defined to disable
the power feed, setting the pin DISS on high. If the power feed unit is disabled either by
the DISS pin or by an overload condition (short circuit), it indicates this to the NTC-T AM
with IEC-T functionality selected, setting the CLS pin to high. The NTC-T AM with IEC-
T functionality selected hands this information over to layer 2 units putting HI (high
impedance, see
Chapter 7.3.4
) into the C/I channel (see
Figure 79
).
An overload condition is indicated by the power feed unit with a short response time, by
means of a high on the APF pin (alarm power feed). In this condition, further adaption
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