psf21911 ETC-unknow, psf21911 Datasheet - Page 50

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Semiconductor Group
2.5.1.4
EOC-data is inserted into the U-frame at the positions M1, M2 and M3 thereby permitting
the transmission of two complete EOC-messages (2 12 bits) within one U-superframe.
The EOC contains an address field, a data/message indicator (d/m) and an eight-bit
information field.
With the address field the destination of the transmitted message/data is defined.
Addresses are defined for the NT, 6 repeater stations and broadcasting.
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/
ETSI for diagnostic and loop-back functions. All remaining 120 free codes are available
for future standardization.
Table 7
Address
a1 a2 a3
0
1
0
1
0
1
0
1
0
1
1
0
Embedded Operations Channel (EOC)
EOC-Codes
d/m
EOC
d/m
x
x
x
0
1
1
1
1
1
1
1
1
Information
(hex)
i1 - i8
50
51
52
53
54
FF
00
Direction
NT <---> LT
NT <---- LT
NT <---- LT
NT <---- LT
NT <---- LT
NT <---- LT
NT <---- LT
50
Message
NT
Broadcast
Repeater
stations
No. 1 – No. 6
Data
Message
LBBD
LB1
LB2
RCC
NCC
RTN
H
Function
Close complete Loop
Close Loop B1
Close Loop B2
Request Corrupt CRC
Notify of corrupt CRC
Return to normal
Hold
U-Transceiver
PSB 21911
PSF 21911
11.97