82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 36

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

Table-5 PULS[3:0] Setting in T1/J1 Mode
Figure-17. It is measured in the near end line side, as shown in Figure-
18.
signals (output from TTIP and TRING) are coupled to a 75 Ω 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.
Functional Description
IDT82P2821
In E1 applications, the waveform template meets G.703, as shown in
In E1 applications, the PULS[3:0] should be set to ‘0000’ if differential
-0.20
0.80
0.00
1.00
0.60
0.40
0.20
1.20
-0.6
DSX1 - 133 ~ 266 ft
DSX1 - 266 ~ 399 ft
DSX1 - 399 ~ 533 ft
DSX1 - 533 ~ 655 ft
Cable Conditions
DSX1 - 0 ~ 133 ft
Figure-17 E1 Waveform Template
J1 - 0 ~ 655 ft
-0.4
-0.2
Time in Unit Intervals
0
0.2
PULS[3:0]
0010
0011
0100
0101
0110
0111
0.4
0.6
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
36
Figure-18 E1 Waveform Template Measurement Circuit
waveform amplitude can be adjusted to get the desired waveform.
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.
‘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%.
be got based on the preset waveform template:
Table-6 PULS[3:0] Setting in E1 Mode
Internal Impedance matching mode
After one of the preset waveform templates is selected, the preset
In T1 mode, the standard value of the SCAL[5:0] bits (b5~0,
In E1 mode, the SCAL[5:0] bits (b5~0, SCAL,...) should be set to
In summary, do the following step by step, the desired waveform will
• Select one preset waveform template by setting the PULS[3:0] bits
• Write ‘100001 to the SCAL[5:0] bits (b5~0, SCAL,...) if E1 mode is
• Write the scaling value to the SCAL[5:0] bits (b5~0, SCAL,...) to
Note: R
Note: R
(b3~0, PULS,...);
selected.
scale the amplitude of the selected preset waveform template (-
this step is optional).
E1 75 Ω
IDT82P2821
IDT82P2821
Interface Conditions
Other E1 interface
LOAD
LOAD
differential interface,
= 75 Ω or 120 Ω (+ 5%)
= 75 Ω or 120 Ω (+ 5%)
TTIPn
TTIPn
TRINGn
TRINGn
February 6, 2009
PULS[3:0]
R
R
0000
0001
LOAD
LOAD
V
V
OUT
OUT