XR72L52 Datasheet, PDF (117/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
2.3.6.21 Transmit E3 TTB-14 Register (E3, ITU-T G.832)
TXE3 TTB-14 REGISTER (ADDRESS = 0X46)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
TxTTB-14[7:0]
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
BIT 2
R/W
0
XRT72L52
REV. 1.0.1
BIT 1
R/W
0
BIT 0
R/W
0
This Read/Write byte-field, along with the Tx TTB-0 through Tx TTB-13 and Tx TTB-15 registers permit a user
to define a Trail Access Point Identifier sequence of bytes, that will be transmitted to the Remote Terminal. The
Remote Receiving Terminal will use this sequence of bytes to verify that it is connected to the proper Transmit-
ting Terminal. The Transmit DS3/E3 Framer block will take the contents of these 16 registers, and insert them
into the TR byte of the outbound E3 frame. In the fifteenth of a set of 16 E3 Frames, the Transmit DS3/E3
Framer block will read in the contents of this register, and insert it into the TR byte-field, within the very next
outbound E3 frame.
The contents of this register, along with Tx TTB-1 through Tx TTB-13 and Tx TTB-15 are used to transmit 15
ASCII characters required for the E.164 numbering format.
2.3.6.22 Transmit E3 TTB-15 Register (E3, ITU-T G.832)
TXE3 TTB-15 REGISTER (ADDRESS = 0X47)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-15[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
This Read/Write byte-field, along with the Tx TTB-0 through Tx TTB-14 registers permit a user to define a Trail
Access Point Identifier sequence of bytes, that will be transmitted to the Remote Terminal. The Remote Re-
ceiving Terminal will use this sequence of bytes to verify that it is connected to the proper Transmitting Termi-
nal. The Transmit DS3/E3 Framer block will take the contents of these 16 registers, and insert them into the
TR byte of the outbound E3 frame. In the sixteenth of a set of 16 E3 Frames, the Transmit DS3/E3 Framer
block will read in the contents of this register, and insert it into the TR byte-field, within the very next outbound
E3 frame.
The contents of this register, along with Tx TTB-1 through Tx TTB-15 are used to transmit 15 ASCII characters
required for the E.164 numbering format.
2.3.6.23 Transmit E3 FA1 Byte Error Mask Register (E3, ITU-T G.832)
TXE3 FA1 ERROR MASK REGISTER (ADDRESS = 0X48)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxFA1_Error_Mask_Byte[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
This Read/Write bit-field permits the user to insert errors into the Framing Alignment octet, FA1 of each out-
bound E3 frame. The user may wish to do this for equipment testing purposes. Prior to transmission, the
Transmit DS3/E3 Framer block reads in the FA1 byte, and performs an XOR operation with it and the contents
of this register. The results of this operation are written back into the FA1 octet position, in each outbound E3
101