
XRT7234
E3 UNI FOR ATM
x r
PRELIMINARY
REV. P1.0.0
76
This “Read/Write” byte-field, along with the “Tx TTB-1” 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 Terminal will use this sequence of bytes to verify that it is connected to the proper “Transmitting Ter-
minal”. 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 first 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.
This particular byte-field should contain the pattern “[1, C6, C5, C4, C3, C2, C1, C0]” where C6 through C0 are
the results of a CRC-7 calculation over the previous 16-byte frame.
Note:
The XR-T7234 E3 UNI will not compute this CRC-7 value. It is up to the user’s hardware and/or software
to compute this value, prior to writing it into this register.
3.3.2.47 Tx TTB-1 Register
This “Read/Write” byte-field, along with the “Tx TTB-0” and “Tx TTB-2” through “Tx TTB-15” register 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 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 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.
3.3.2.48 Tx TTB-2 Register
This “Read/Write” byte-field, along with the “Tx TTB-0”, “Tx TTB-1” and “Tx TTB-3” through “Tx TTB-15” regis-
ter 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 Terminal 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 outbound E3 frame. In the third of a set of 16 E3 Frames, the Transmit E3
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
0
0
0
0
0
0
Address = 2Dh, Tx TTB-1 Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Transmit Trail Trace Buffer Byte-1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Address = 2Eh, Tx TTB-2 Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Transmit Trail Trace Buffer Byte-2
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Address = 2Ch, Tx TTB-0 Register