PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 106

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
4.2
The U-frame is not directly accessible by the user. Communication with the U-interface
will be established using the user interfaces IOM
shows how this can be done for both receive and transmit directions. Figures 44 and 45
sketch the available ways of access to the different channels of the U-interface data in
both directions. For more details about the structure of the U-frame, see "U -Frame
Structure", page 67. For blocks’ functions, see "System Interface Unit", page 62.
In addition, Section 4.2.4, page 124, describes how the U-interface superframe marker
can be set and indicated.
Figure 44
Transmitter
(To U)
2B+D
MON-0
MON-1
MON-2
PS1,PS2
(2B+D &
M4)
Data
3)
1) From IOM
2) Applies only in NT modes
3) From the last U superframe.
1)
Not directly accessable to user
1)
1)2)
1)
Access to U-Interface
2)
Channels of Access to U-Interface (Transmitter)
®
-2 or µP
Transmiter
Single Bits
Processor
Processor
Processor
FIFO
EOC
CRC
18 Bits
Fixed
(I)SW
12x (2B+D)
216 Bits
Data
106
U Basic Frame
1.5 ms
M1-M3
3 Bits
®
-2, µP (if used) or pins. This chapter
1 Bit
M4
Operational Description
M5-M6
2 Bit
Data Sheet 01.99
PEB 2091
PEF 2091
Time