peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 159

• Manufacturer Part Number: peb2256
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

which shall be latched on ports XDI and XP(A:D) is programmable by bits
SIC2.SICS(2:0), the remaining channel phases are cleared or ignored respectively.
The following table gives an overview of the transmit buffer operating modes.
Table 40
Buffer Size
bypass
short buffer
1 frame
2 frames
5.4.5
In long-haul applications the transmit pulse masks are optionally generated according to
FCC68 and ANSI T1. 403. To reduce the crosstalk on the received signals the
FALC56 offers the ability to place a transmit attenuator in the data path. Transmit
attenuation is selectable from 0, -7.5, -15 or -22.5 dB (register LIM2.LBO2/1).
ANSI T1. 403 defines only 0 to -15 dB.
The FALC56 includes a programmable pulse shaper to satisfy the requirements of ANSI
T1. 102, also various DS1, DSX-1 specifications are met. The amplitude of the pulse
shaper is individually programmable by the microprocessor to allow a maximum of
different pulse templates. The line length is selected by programming the registers
XPM(2:0) as shown for typical values in the table below. The values are optimized for
transformer ratio: 1:2.4; cable: PULP 22AWG (100 Ω ); serial resistors: 2 Ω .
Table 41
Range in
m
0 to 40
40 to 81
81 to 122
122 to 162 399 to 533 5F
162 to 200 533 to 655 3F
The transmitter requires an external step up transformer to drive the line.
Data Sheet
Programmable Pulse Shaper and Line Build-Out (T1/J1)
Range in
ft.
0 to 133
133 to 266 FA
266 to 399 3D
Transmit Buffer Operating Modes (T1/J1)
Pulse Shaper Programming (T1/J1)
XPM0
D7
TS Offset programming
enabled
disabled
enabled
enabled
hexadecimal
XPM1
22
26
37
3F
CB
159
XPM2
1
1
1
1
1
XP04-
XP00
23
26
29
31
31
Functional Description T1/J1
Slip performance
no
yes
yes
yes
XP14-
XP10
22
23
25
26
25
decimal
XP24-
XP20
8
9
13
15
18
FALC56 V1.2
PEB 2256
2002-08-27
XP34-
XP30
2
2
2
2
3