XRT72L58
EIGHT CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
á
PRELIMINARY
393
Generate and transmit a desired value for the
FEBE (Far-End-Block Error) bit, within the MA byte.
The procedure and results of generating any of these
alarm conditions is presented below.
The user can exercise each of these options by writ-
ing the appropriate data to the Tx E3 Configuration
Register (Address = 0x30). The bit format of this reg-
ister is presented below.
Bit-field 2 through 0 permit the user to transmit vari-
ous alarm conditions to the remote terminal equip-
ment. The role/function of each of these three bit-
fields within the register, are discussed below.
6.2.4.2.1.1
Tx AIS Enable - Bit 2
This read/write bit field permits the user to force the
transmission of an AIS (Alarm Indication Signal) pat-
tern to the remote terminal equipment via software
control. If the user opts to transmit an AIS pattern,
then the Transmit Section of the Framer IC will begin
to transmit an unframed all ones pattern to the re-
mote terminal equipment. Table 79 presents the rela-
tionship between the contents of this bit-field, and the
resulting Framer action.
N
OTE
:
This bit is ignored whenever the TxLOS bit-field is
set.
6.2.4.2.1.2
Transmit LOS Enable - Bit 1
This read/write bit field allows the user to transmit an
LOS (Loss of Signal) pattern to the remote terminal,
upon software control. Table 80 relates the contents
of this bit field to the Transmit E3 Framer block's ac-
tion.
TXE3 CONFIGURATION REGISTER (ADDRESS = 0X30)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Not Used
TxDL
in NR
Not Used
TxAIS
Enable
TxLOS
Enable
TxMARx
RO
RO
RO
R/W
RO
R/W
R/W
R/W
0
0
0
0
0
0
0
0
T
ABLE
79: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
2 (T
X
AIS E
NABLE
)
WITHIN
THE
T
X
E3
C
ONFIGURATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
E3 F
RAMER
B
LOCK
'
S
A
CTION
B
IT
2
T
RANSMIT
E3 F
RAMER
'
S
A
CTION
0
Normal Operation:
The Transmit Section of the XRT72L58 Framer IC will transmit E3 traffic based upon data that it accepts via
the Transmit Payload Data Input Interface block, the Transmit Overhead Data Input Interface block, the Trans-
mit HDLC Controller block and internally generated overhead bytes.
Transmit AIS Pattern:
The Transmit E3 Framer block will overwrite the E3 traffic, within an Unframed All Ones pattern.
1
T
ABLE
80: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
1 (T
X
LOS)
WITHIN
THE
T
X
E3 C
ONFIGURATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
E3 F
RAMER
B
LOCK
'
S
A
CTION
B
IT
1
T
RANSMIT
E3 F
RAMER
'
S
A
CTION
0
Normal Operation:
The Overhead bits are either internally generated, or they are inserted via the Transmit Overhead Data Input
Interface or the Transmit HDLC Controller blocks. The Payload bits are received from the Transmit Payload
Data Input Interface.
Transmit LOS Pattern:
When this command is invoked the Transmit E3 Framer will do the following.
Set all of the overhead bytes to "0" (including the FA1 and FA2 bytes)
Overwrite the E3 payload bits with an "all zeros" pattern.
1