peb20954 Infineon Technologies Corporation, peb20954 Datasheet - Page 32

• Manufacturer Part Number: peb20954
• Description: Smart Integrated Digital Echo Canceller Sidec
• Manufacturer: Infineon Technologies Corporation

Preliminary Data Sheet
4
4.1
Figure 11 illustrates an example for the pin connection of the SIDEC to an E1/T1 IC and
to an interworking element IC.
The SIDEC is used to cancel the echo on the side of the FALC PEB 2254 or FALC-LH
PEB 2255 which is the near end in this case. There are two SIEMENS products in this
Inter working unit connected to the SIDEC. The FALC serves as a frame and line
interface component whereas the IWE8 PEB 4220 operates as an interworking element.
For multiframe alignment in the IWE8, FRMFBX must have a correct timing relation to
FRDATX. For this purpose the SIDEC adjusts the delay from the TMFBI input to the
TMFBO output to the delay of the SI input to the SO output. For the support of the CAS-
BR transparency the SIDEC passes the robbed bits that are indicated by the FALC via
the TSIGM input directly through to the SO output by overwriting the computed value of
the robbed bit with the value of the SI input.
Figure 11
Synchronization Pulse Transmit
Synchronization Pulse Receive
FALC
Receive Multiframe Begin
System Clock 8.192 MHz
Receive Data Out (RDO)
Transmit Data In (XDI)
System Clock Transmit
Receive Signal Marker
System Clock Receive
Frame SYNC (FSC)
Operational Description
Pin Connection Diagram for SIDEC
Internet Working Unit: SIDEC between a FALC and IWE8
(SCLKR)
(SCLKX)
(CLK8M)
(RSIGM)
(RMFB)
(SYPR)
(SYPX)
8 kHz
8.192 MHz
TMFBI
TSIGM
RO
SYNCI
SI
SCLKI
SIDEC
32
CTRL32
32.768 MHz
VCO
TMFBO
CLK32
SO
RI
Operational Description
Framer Receive Multiframe
Begin (FRMFBO)
Reference Clock for SYM
Mode (RFCLK)
Framer Receive Data Input
(FRDATX)
Framer Transmit Data Output
(FTDATX)
PEB 20954
PEF 20954
IWE8
04.99