82P2288BB IDT, Integrated Device Technology Inc, 82P2288BB Datasheet - Page 101

• Manufacturer Part Number: 82P2288BB
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2288BB

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

3.24.1.2 E1 Mode
which meets G.703, and it is measured on the near line side as shown in
Figure 35.
Table 60: PULS[3:0] Setting In T1/J1 Mode
Functional Description
IDT82P2288
Note: R
Figure 35. E1 Pulse Template Measurement Circuit
In E1 applications, the waveform template is shown in Figure 34,
-0.20
0.80
IDT82P2288
0.00
1.00
0.60
0.40
0.20
1.20
LOAD
Cable Configuration
-0.6
T1 - 133 ~ 266 ft
T1 - 266 ~ 399 ft
T1 - 399 ~ 533 ft
T1 - 533 ~ 655 ft
T1 - 0 ~ 133 ft
Figure 34. E1 Waveform Template
J1 - 0 ~ 655 ft
= 75 Ω or 120 Ω (+ 5%)
-0.4
TRINGn
TTIPn
-0.2
Time In Unit Intervals
0
0.2
R
PULS[3:0]
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 0 1 0
LOAD
0.4
V
OUT
0.6
101
OCTAL T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
corresponding to two kinds of cable impedance. The selection is made
by the PULS[3:0] bits. In internal impedance matching mode, if the cable
impedance is 75 Ω, the PULS[3:0] bits should be set to ‘0000’; if the
cable impedance is 120 Ω, the PULS[3:0] bits should be set to ‘0001’. In
external impedance matching mode, for both 75 Ω and 120 Ω cable
impedance, the PULS[3:0] bits should be set to ‘0001’.
3.24.2 LINE BUILD OUT (LBO) (T1 ONLY)
should be attenuated before transmission to prevent the cross-talk in the
far end. Three LBOs are used to implement the pulse attenuation. Four
grades of attenuation with each step of 7.5 dB are specified in the FCC
Part 68 Regulations. The attenuation grade is selected by the PULS[3:0]
bits. The details are listed in Table 61.
3.24.3 USER-PROGRAMMABLE ARBITRARY WAVEFORM
haul applications and long haul applications if the PULS[3:0] bits are set
to ‘11XX’ in the corresponding link. This allows the transmitter perfor-
mance to be tuned for a wide variety of line condition or special applica-
tion.
by the UI[1:0] bits, and each UI is divided into 16 sub-phases addressed
by the SAMP[3:0] bits. The pulse amplitude of each phase is repre-
sented by a binary byte, within the range from +63 to -63, stored in the
WDAT[6:0] bits in signed magnitude form. The maximum number +63
(D) represents the positive maximum amplitude of the transmit pulse
while the most negative number -63 (D) represents the maximum nega-
tive amplitude of the transmit pulse. Thus, up to 64 bytes are used. For
each channel, a 64 bytes RAM is available.
ROM. One of them can be selected as reference and made some
changes to get the desired waveform.
is the most similar to the desired pulse shape, from the following 12
tables (Table 62 to Table 73), and set the SCAL[5:0] bits to the corre-
sponding standard value. Table 62 to Table 73 list the sample data and
the standard scaling value of each of the 12 templates.
transmit pulse shape. By increasing or decreasing by ‘1’ from the stan-
dard value in the SCAL[5:0] bits, the pulse amplitude can be scaled up
Table 61: LBO PULS[3:0] Setting In T1 Mode
To meet the template, two preset waveform templates are provided
In long haul applications, the output on the TTIPn/TRINGn pins
User-programmable arbitrary waveform can be used in both short
Each pulse shape can extend up to 4 UIs (Unit Interval) addressed
There are twelve standard templates which are stored in a local
To do this, the first step is to choose a set of waveform value, which
Modifying the corresponding sample data can get the desired
Cable Configuration
-15.0 dB LBO
-22.5 dB LBO
-7.5 dB LBO
0 dB LBO
JANUARY 10, 2011
PULS[3:0]
0 0 1 0
1 0 0 1
1 0 1 0
1 0 1 1