XRT7250 datasheet(117/463 Pages) EXAR

117 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

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)

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)

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.

TXE3 TTB-12 REGISTER (ADDRESS = 0X44)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

TxTTB-12[7:0]

R/W

000

TXE3 TTB-13 REGISTER (ADDRESS = 0X45)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

TxTTB-13[7:0]

R/W

000

TXE3 TTB-14 REGISTER (ADDRESS = 0X46)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

TxTTB-14[7:0]

R/W

000

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