XRT7250 Datasheet, PDF (113/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250 DS3/E3 FRAMER IC
REV. 1.1.1
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TXE3 TTB-1 REGISTER (ADDRESS = 0X39)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
TxTTB-1[7:0]
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
BIT 2
R/W
0
BIT 1
R/W
0
BIT 0
R/W
0
This Read/Write byte-field, along with the TxTTB-0
and TxTTB-2 through TxTTB-15 register allows a us-
er to define a Trail Access Point Identifier sequence of
bytes, that will be transmitted to the Far-End Termi-
nal. The Far-End Receiving Terminal will use this se-
quence of bytes to verify that it is connected to the
proper Transmitting Terminal. The Transmit E3 Fram-
er will take the contents of these 16 registers, and in-
sert them into the TR byte of the outbound E3 frame.
In the second of a set of 16 E3 Frames, the Transmit
E3 Framer 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-2
through Tx TTB-15 are used to transmit 15 ASCII
characters required for the E.164 numbering format.
2.3.6.9 Transmit E3 TTB-2 Register (E3, ITU-T
G.832)
TXE3 TTB-2 REGISTER (ADDRESS = 0X3A)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-2[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 TxTTB-0,
TxTTB-1 and TxTTB-3 through TxTTB-15 register al-
lows a user to define a Trail Access Point Identifier se-
quence of bytes, that will be transmitted to the Far-
End Terminal. The Far-End Receiving Terminal will
use this sequence of bytes to verify that it is connect-
ed to the proper Transmitting Terminal. The Transmit
E3 Framer will take the contents of these 16 registers,
and insert them into the TR byte of the outbound E3
frame. In the third of a set of 16 E3 Frames, the
Transmit E3 Framer 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,
and Tx TTB-3 through Tx TTB-15 are used to trans-
mit 15 ASCII characters required for the E.164 num-
bering format.
2.3.6.10 Transmit E3 TTB-3 Register (E3, ITU-T
G.832)
TXE3 TTB-3 REGISTER (ADDRESS = 0X3B)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-3[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 TxTTB-0
through TxTTB-2 and TxTTB-4 through TxTTB-15
registers allows a user to define a Trail Access Point
Identifier sequence of bytes, that will be transmitted to
the Far-End Terminal. The Far-End Receiving Termi-
nal will use this sequence of bytes to verify that it is
connected to the proper Transmitting Terminal. The
Transmit E3 Framer will take the contents of these 16
registers, and insert them into the TR byte of the out-
bound E3 frame. In the fourth of a set of 16 E3
Frames, the Transmit E3 Framer will read in the con-
tents of this register, and insert it into the TR byte-
field, within the very next outbound E3 frame.
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