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參數(shù)資料
| 型號： | T9000 |
| 英文描述： | ISDN Network Termination Node (NTN) Device |
| 中文描述： | ISDN網(wǎng)絡(luò)終端節(jié)點(diǎn)（新界北）設(shè)備 |
| 文件頁數(shù)： | 8/126頁 |
| 文件大?。?/td> | 2127K |
| 代理商： | T9000 |
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8
Lucent Technologies Inc.
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
T9000
4 Pin Information
(continued)
Table 1. S/T-Interface Pins (6)
Table 2. U-Interface Pins (7)
Pin Name Pin #
CSENS
FT
Type
—
I
Pin Description
58
71
Current Sense.
Connect an 11.5 k
, 1%, resistor from this pin to GND
A
.
Fixed Timing Control.
Upon exiting from RESET, the state of this pin is sampled
internally and written to register SCR0[FT] to control whether the S-block receiver
uses fixed or adaptive timing (note that the 80C32 is free to overwrite register bit
SCR0[FT] subsequent to this). Internal 50 k
pull-down.
0: Adaptive Timing. Incoming data at S/T-interface is sampled at a point defined by
an adaptive timing algorithm.
1: Fixed Timing. Incoming data at the S/T-interface is sampled with a fixed delay
relative to the S/T transmitter clock.
Transmit Positive Rail for S/T-Interface.
Positive output of S/T-interface analog
transmitter. Connect to transformer through a 121
, 1% resistor.
Transmit Negative Rail for S/T-Interface.
Negative output of S/T-interface analog
transmitter. Connect to transformer through a 121
, 1% resistor.
Receive Positive Rail for S/T-Interface.
Positive input of S/T-interface analog
receiver. Connect to transformer through a 10 k
, 10% resistor.
Receive Negative Rail for S/T-Interface.
Negative input of S/T-interface analog
receiver. Connect to transformer through a 10 k
, 10% resistor.
TPR
54
O
TNR
51
O
RPR
55
I
RNR
56
I
Pin Name
LOP
Pin #
68
Type
O
Pin Description
Line Driver Positive Output for U-Interface.
Connect to U-interface transformer
through a 16.9
,
1% resistor.
Line Driver Negative Output for U-Interface.
Connect to U-interface transformer
through a 16.9
,
1% resistor.
Positive Voltage Reference for U-Interface Circuits.
Connect a 0.1
μ
F, 20% capac-
itor to GND
A
(as close to the device pins as possible).
Negative Voltage Reference for U-Interface Circuits.
Connect a 0.1
μ
F, 20%
capacitor to GND
A
(as close to the device pins as possible).
Common-Mode Voltage Reference for U-Interface Circuits.
Connect a 0.1
μ
F,
20% capacitor to GND
A
(as close to the device pins as possible).
Sigma-Delta A/D Negative Input for U-Interface.
Connect via an 820 pF, 20%
capacitor to SDINP.
Sigma-Delta A/D Positive Input for U-Interface.
Connect via an 820 pF, 20%
capacitor to SDINN.
LON
65
O
VRP
61
—
VRN
60
—
VRCM
62
—
SDINN
64
I
SDINP
63
I
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