XRT7250 Datasheet, PDF (117/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250 DS3/E3 FRAMER IC
REV. 1.1.1
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TXE3 TTB-12 REGISTER (ADDRESS = 0X44)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
TxTTB-12[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 Tx TTB-0
through Tx TTB-11 and Tx TTB-13 through Tx TTB-
15 registers allows a user to define a Trail Access
Point Identifier sequence of bytes, that will be trans-
mitted to the Far-End Terminal. The Far-End Receiv-
ing Terminal will use this sequence of bytes to verify
that it is connected to the proper Transmitting Termi-
nal. 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 thirteenth 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
through Tx TTB-11 and Tx TTB-13 through Tx TTB-
15 are used to transmit 15 ASCII characters required
for the E.164 numbering format.
2.3.6.20 Transmit E3 TTB-13 Register (E3, ITU-T
G.832)
TXE3 TTB-13 REGISTER (ADDRESS = 0X45)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxTTB-13[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-12, Tx-TTB-14, and Tx TTB-15 regis-
ters allows a user to define a Trail Access Point Iden-
tifier sequence 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 con-
nected 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 fourteenth 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.
The contents of this register, along with Tx TTB-1
through Tx TTB-12, Tx TTB-14 and Tx TTB-15 are
used to transmit 15 ASCII characters required for the
E.164 numbering format.
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
BIT 2
BIT 1
BIT 0
TxTTB-14[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-13 and Tx TTB-15 registers allows a
user 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 fifteenth 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.
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