T7256 Agere Systems, T7256 Datasheet - Page 13

• Manufacturer Part Number: T7256
• Description: (T7234 - T7256) Compliance
• Manufacturer: Agere Systems

Lucent Technologies Inc.
February 1998
U-Interface Frame Structure
Bit Assignments
Table 2. U-Interface Bit Assignment
* LT(NT). Values in parentheses () indicate meaning at the NT.
† cso is fixed at 0 by the device to indicate both cold and warm start capability.
‡ nib is fixed at 1 by the device to indicate the link is normal.
Frame #
Frame #
Bit #
Bit #
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1—18
Sync
1—18
ISW
Sync
SW
SW
SW
SW
SW
SW
SW
ISW
SW
12(2B+D)
19—234
12(2B+D)
19—234
2B+D
2B+D
2B+D
2B+D
2B+D
2B+D
2B+D
2B+D
2B+D
Figure 4. U-Interface Superframe Bit Groups
(continued)
eoc
eoc
eoc
eoc
eoc
eoc
eoc
eoc
235
M1
235
M1
T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver
dm
dm
a1
a1
i3
i6
i3
i6
eoc
eoc
eoc1
eoc2
eoc
eoc
eoc
eoc
eoc
eoc
236
M2
236
M2
a2
a2
i1
i4
i7
i1
i4
i7
eoc
eoc
eoc
eoc
eoc
eoc
eoc
eoc
237
M3
237
M3
a3
a3
i2
i5
i8
i2
i5
i8
R
R
R
dea (ps1)*
aib (nib)*
uoa (sai)*
5, 4
3, 4
4, 4
R
238
M4
act
238
M4
(cso)*
(ps2)*
(ntm)*
6, 4
CONTROL & STATUS (UCS)
‡
†
crc
R
R
239
crc
crc
crc
crc
crc
M5
239
M5
1, 5
2, 5
11
1
3
5
7
9
crc
crc
crc
febe
R
crc
crc
crc
crc
240
M6
240
M6
1, 6
10
12
2
4
6
8
9