pef2256e Infineon Technologies Corporation, pef2256e Datasheet - Page 165

• Manufacturer Part Number: pef2256e
• 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 41
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
FALC
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 FALC
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 transmitter requires an external step up transformer to drive the line. The values are
optimized for a transformer ratio of 1:2.4 and cable type PULP 22AWG (100 Ω). Other
external configurations require an adaption of these values.
Table 42
Range in
m
Serial Resistor Value: 2 Ω
0 to 40
40 to 81
81 to 122
122 to 162 399 to 533 FC
162 to 200 533 to 655 1E
User’s Manual
Hardware Description
®
56 offers the ability to place a transmit attenuator in the data path. Transmit
®
Programmable Pulse Shaper and Line Build-Out (T1/J1)
56 includes a programmable pulse shaper to satisfy the requirements of
Range in
ft.
0 to 133
133 to 266 B6
266 to 399 D9
Transmit Buffer Operating Modes (T1/J1)
Pulse Shaper Programming (T1/J1)
XPM0
95
TS Offset programming
Enabled
Disabled
Enabled
Enabled
hexadecimal
XPM1
16
1E
26
36
C3
Table 42
165
XPM2
1
1
1
1
1
below.
XP04-
XP00
Functional Description T1/J1
Slip performance
No
Yes
Yes
Yes
XP14-
XP10
decimal
DS1.1, 2003-10-23
PEF 2256 H/E
XP24-
XP20
FALC
XP34-
XP30
®
56