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參數(shù)資料
| 型號： | T7264 |
| 英文描述： | T7264 U-Interface 2B1Q Transceiver |
| 中文描述： | T7264 U型接口2B1Q收發(fā)器 |
| 文件頁數(shù)： | 23/54頁 |
| 文件大?。?/td> | 876K |
| 代理商： | T7264 |
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Lucent Technologies Inc.
23
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
K2 Functional Description
(continued)
The U superframe and the K2 superframe both occur
once every 12 ms. The U frame consists of 240 bits,
with eight U frames per superframe, transferred at a
data rate of 160 kbits/s. The K2 superframe consists of
96 K2 frames transferred at a data rate of 512 kbits/s.
In mapping the K2 to U, the blocks of 2B+D data, which
occur once every K2 frame, are accumulated within the
T7264 and are output in groups of twelve blocks per
U frame onto the U-interface. The last 6 bits of the D
octet and the S1 octet are unused on DI. While every
K2 frame has bits allocated for eoc messages, only two
messages per U superframe are needed. K2 frame
number 11 (K11) provides the data for the first eoc
message on the U-interface, and K2 frame K59 pro-
vides the data for the second eoc message. The other
94 K2 frames are unused. Every K2 frame also has bits
allocated for UCS data; however, only a single set of
UCS data is needed in a U superframe. K2 frame num-
ber K11 provides the UCS data while the other 95 K2
frames are unused. The crc is automatically generated
by the T7264 and presented to the U-interface. The DC
octet is used to transfer control data to the T7264 and is
sampled every K2 frame.
In mapping the U to K2, the 2B+D data, which occur in
groups of 216 bits (12 times [2B+D]), are accumulated
within the T7264 and output as one 2B+D block per K2
frame. The last 4 bits of the D octet provide indication
onto the K2 interface about when data transferred on
the K2 interface corresponds to data transferred on the
U-interface for both transmit and receive. The eoc bits
are collected by the T7264 and changed on the K2
interface twice per superframe on K2 frames K47 (held
until K94) and K95 (held until K46). The UCS bits are
collected by the T7264 and changed on the K2 inter-
face once per superframe on K2 frame K95 (held until
K94). The DS octet is used to transfer device status
from the T7264 to the K2 interface. The crc is automat-
ically calculated in the T7264, and a single bit (nebe) in
the DS octet provides indication of a crc error.
K2 Framing Bits
The four DF bits (the last 4 bits of the D octet on DO)
indicate when the 2B+D data from the K2 interface and
U-interface correspond. A system can monitor these
signals to determine when the T7264 is transmitting or
receiving specific data. RSF and TSF mark the first
frame (K0) of a superframe. RF and TF add resolution
in identifying the start of each U frame (every twelfth K2
frame). Figure 16 shows when eoc and UCS data is
transferred to and from the K2 interface. It also indi-
cates the occurrence of the RSF, TSF, RF, and TF bits.
Notice that the DI and DO superframes are not aligned,
and therefore RSF and TSF occur at different times.
5-5175
Figure 16. K2-to-U Mapping
RSF
RF
DI
DO
K0
K1
K12
K47
K59
K60
. . .
. . .
K95
. . .
. . .
K11
K48
NEW
eoc
NEW eoc
& UCS
RSF, RF
RF
RF
RF
. . .
K6
K94
K0
K1
K12
K47
K59
K60
. . .
. . .
K95
. . .
. . .
K11
K48
eoc & UCS
MUST BE VALID
eoc
MUST BE VALID
. . .
K6
K94
TSF
TF
2 K2
FRAMES
IN NT
TSF, TF
TF
TF
TF
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