peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 369

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

Line Interface Mode 2 (Read/Write)
Value after reset: 20
LIM2
LBO(2:1)
SLT(1:0)
SCF
Data Sheet
LBO2
7
Line Build-Out
In long-haul applications LIM0.EQON = 1 a transmit filter can be
optionally placed on the transmit path to attenuate the data on pins
XL1/2. Selecting the transmitter attenuation is possible in steps of
7.5 dB at 772kHz which is according to FCC68 and ANSI T1.403.
To meet the line build-out defined by ANSI T1.403 registers XPM(2:0)
should be programmed as follows:
00 =
01 =
10 =
11 =
Receive Slicer Threshold
00 = The receive slicer generates a mark (digital one) if the voltage
01 = The receive slicer generates a mark (digital one) if the voltage
10 = The receive slicer generates a mark (digital one) if the voltage
11 = The receive slicer generates a mark (digital one) if the voltage
Select Corner Frequency of DCO-R
Setting this bit reduces the corner frequency of the DCO-R circuit by
the factor of ten to 0.6 Hz.
Note: Reducing the corner frequency of the DCO-R circuitry
increases the synchronization time before the frequencies are
synchronized.
LBO1
H
at RL1/2 exceeds 55% of the peak amplitude.
at RL1/2 exceeds 67% of the peak amplitude (may be used in
some T1/J1 applications).
at RL1/2 exceeds 50% of the peak amplitude (default,
recommended in T1/J1 mode).
at RL1/2 exceeds 45% of the peak amplitude.
0 dB
7.5 dB
-15 dB
-22.5 dB
SLT1
SLT0
→ XPM(2:0) = 20
→ XPM(2:0) = 20
→ XPM(2:0) = 20
369
SCF
ELT
H
H
H
, 02
, 01
, 01
H
H
H
, 51
, 51
, 50
H
H
H
T1/J1 Registers
LOS1
FALC56 V1.2
0
PEB 2256
2002-08-27
(3A)