XRT7250 datasheet(113/463 Pages) EXAR

113 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

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)

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

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)

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.

TXE3 TTB-1 REGISTER (ADDRESS = 0X39)

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

TxTTB-1[7:0]

R/W

000

TXE3 TTB-2 REGISTER (ADDRESS = 0X3A)

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

TxTTB-2[7:0]

R/W

000

TXE3 TTB-3 REGISTER (ADDRESS = 0X3B)

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

TxTTB-3[7:0]

R/W

000

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