peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 135

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

5.3.5
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...-15 dB.
The FALC
ANSI T1. 102, also various DS1, DSX-1 specifications are met. The amplitude of the
pulse shaper is programmable individually via the microprocessor interface to allow a
maximum of different pulse templates. The line length is selected by programming the
registers XPM2...0 as shown for typical values in the table below. The values with
transformer ratio: 1:
register values are given in decimal.
•
Table 31
Range in
m
0...40
40...81
81...122
122...162
162...200
The transmitter requires an external step up transformer to drive the line. The required
programming values might vary between applications and have to be optimized
according to external component values, parasitics, and so on.
Data Sheet
®
-LH offers the ability to place a transmit attenuator in the data path. Transmit
®
Programmable Pulse Shaper and Line Build-Out (T1/J1)
-LH includes a programmable pulse shaper to satisfy the requirements of
Range in
ft.
0...133
133...266
266...399
399...533
533...655
Pulse Shaper Programming (T1/J1)
2
; cable: PULP 22AWG (100 ); serial resistors: 5
XPM0
7D
5B
7F
5F
19
hexadecimal
XPM1
AB
BB
9B
9F
B7
135
XPM2
01
01
01
01
01
XP04-
XP00
Functional Description T1/J1
25
27
29
31
31
XP14-
XP10
24
26
27
27
26
decimal
FALC-LH V1.3
XP24-
XP20
10
13
14
6
7
PEB 2255
. The XPM
XP34-
XP30
2000-07
3
3
3
3
3