PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 231

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

6.3
The EOC contains an address field, a data/message indicator and an eight-bit
information field, see "U -Frame Structure", page 67 for details.
The data/message indicator needs to be set to (1) to indicate that the information field
contains a message. If set to (0), numerical data is transferred to the NT. Currently no
numerical data transfer to or from the NT is required.
From the 256 codes possible in the information field 64 are reserved for non-standard
applications, 64 are reserved for internal network use and eight are defined by ANSI for
diagnostic and loop-back functions. All remaining 120 free codes are available for future
standardization.
Table 48
Semiconductor Group
Address
a1a2a3
Field
0 01
1 10
000
111
Predefined EOC Codes
Supported EOC-Commands
Message
Indicator
Data/
d/m
0
1
1
1
1
1
1
1
1
1
x
x
x
EOC
i1 i2 i3 i4 i5 i6 i7 i8
0 1 0 1 0 0 0 0
0 1 0 1 0 0 0 1
0 1 0 1 0 0 1 0
0 1 0 1 0 0 1 1
0 1 0 1 0 1 0 0
1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0
1 0 1 0 1 0 1 0
Information
231
D/O
LT
O
O
O
O
O
O
D
D (estination)
O (rigin)
O/D
NT
D
D
D
D
D
D
O
Repeater stations
Data Sheet 01.99
No. 1 – No. 6
Programming
Broadcast
Message
Message
LBBD
RCC
NCC
PEB 2091
Data
RTN
ACK
PEF 2091
LB1
LB2
NT
H