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型号： IDT82P2828BHG
厂商： IDT, Integrated Device Technology Inc
文件页数： 85/154页
文件大小： 0K
描述： IC LIU T1/J1/E1 28+1CH 640-PBGA
标准包装： 5
类型： 线路接口装置（LIU）
规程： E1
电源电压： 3.13 V ~ 3.47 V
安装类型： 表面贴装
封装/外壳： 640-BGA 裸露焊盘
供应商设备封装： 640-PBGA-EP（31x31）
包装： 托盘
其它名称： 82P2828BHG
IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Functional Description
36
February 6, 2009
In E1 applications, the waveform template meets G.703, as shown in
Figure-17. It is measured in the near end line side, as shown in Figure-
18.
In E1 applications, the PULS[3:0] should be set to ‘0000’ if differential
signals (output from TTIP and TRING) are coupled to a 75
coaxial
cable using Internal Impedance matching mode; the PULS[3:0] should
be set to ‘0001’ for other E1 interfaces. Refer to Table-6 for details.
Figure-17 E1 Waveform Template
Figure-18 E1 Waveform Template Measurement Circuit
After one of the preset waveform templates is selected, the preset
waveform amplitude can be adjusted to get the desired waveform.
In T1 mode, the standard value of the SCAL[5:0] bits (b5~0,
SCAL,...) is ‘110110’ which is also the default value. The adjusting is
made by increasing or decreasing by ‘1’ from the standard value to scale
up or down at a percentage ratio of 2% against the preset waveform
amplitude.
In E1 mode, the SCAL[5:0] bits (b5~0, SCAL,...) should be set to
‘100001’ to get the standard amplitude. The adjusting is made by
increasing or decreasing by ‘1’ from the standard value to scale up or
down at a percentage ratio of 3%.
In summary, do the following step by step, the desired waveform will
be got based on the preset waveform template:
Select one preset waveform template by setting the PULS[3:0] bits
(b3~0, PULS,...);
Write ‘100001 to the SCAL[5:0] bits (b5~0, SCAL,...) if E1 mode is
selected.
Write the scaling value to the SCAL[5:0] bits (b5~0, SCAL,...) to
scale the amplitude of the selected preset waveform template (-
this step is optional).
Table-5 PULS[3:0] Setting in T1/J1 Mode
Cable Conditions
PULS[3:0]
DSX1 - 0 ~ 133 ft
0010
DSX1 - 133 ~ 266 ft
0011
DSX1 - 266 ~ 399 ft
0100
DSX1 - 399 ~ 533 ft
0101
DSX1 - 533 ~ 655 ft
0110
J1 - 0 ~ 655 ft
0111
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
1.20
Nor
m
alized
Amplitude
Time in Unit Intervals
Table-6 PULS[3:0] Setting in E1 Mode
Interface Conditions
PULS[3:0]
E1 75
differential interface,
Internal Impedance matching mode
0000
Other E1 interface
0001
IDT82P2828
VOUT
RLOAD
TTIPn
TRINGn
Note: RLOAD = 75
or 120 (+ 5%)
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