XRT7250 datasheet(114/463 Pages) EXAR

114 / 463 page

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

The contents of this register, along with Tx TTB-1, Tx

TTB-2 and Tx TTB-4 through Tx TTB-15 are used to

transmit 15 ASCII characters required for the E.164

numbering format.

2.3.6.11 Transmit E3 TTB-4 Register (E3, ITU-T

G.832)

This Read/Write byte-field, along with the TxTTB-0

through TxTTB-3 and TxTTB-5 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 fifth 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-3 and Tx TTB-5 through Tx TTB-15

are used to transmit 15 ASCII characters required for

the E.164 numbering format.

2.3.6.12 Transmit E3 TTB-5 Register (E3, ITU-T

G.832)

This Read/Write byte-field, along with the Tx TTB-0

through Tx TTB-4 and Tx TTB-6 through 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 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 sixth 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-4 and Tx TTB-6 through Tx TTB-15

are used to transmit 15 ASCII characters required for

the E.164 numbering format.

2.3.6.13 Transmit E3 TTB-6 Register (E3, ITU-T

G.832)

This Read/Write byte-field, along with the Tx TTB-0

through Tx TTB-5 and Tx TTB-7 through 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 Terminal. The Far-End Receiving Termi-

nal will use this sequence of bytes to verify that it is

TXE3 TTB-4 REGISTER (ADDRESS = 0X3C)

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

TxTTB-4[7:0]

R/W

0000

000

TXE3 TTB-5 REGISTER (ADDRESS = 0X3D)

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

TxTTB-5[7:0]

R/W

0000

000

TXE3 TTB-6 REGISTER (ADDRESS = 0X3E)

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

TxTTB-6[7:0]

R/W

0000

000

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