參數資料
型號: TTSI2K32T3BAL
英文描述: 2048-Channel, 32-Highway Time-Slot Interchanger
中文描述: 2048通道,32道時隙交換器
文件頁數: 50/66頁
文件大?。?/td> 1321K
代理商: TTSI2K32T3BAL
TTSI2K32T
2048-Channel, 32-Highway Time-Slot Interchanger
Preliminary Data Sheet
February 1999
50
Lucent Technologies Inc.
Configuration Register Architecture
(continued)
Table 39. Receive Highway Configuration Register (Byte 1) (0x1801 + 4i)
*
* i = the receive highway number.
Table 40. Receive Highway Configuration Register (Byte 2)
(0x1802 + 4i)
*
* i = the receive highway number.
Bit
7
6—0
Symbol
RTSOFF
[6—0]
Name/Description
Reserved.
Read as 0.
Receive Highway Time-Slot Offset[6
0].
RTSOFF is used to offset the begin-
ning of an incoming frame by the indicated number of time slots (bytes). If no
time-slot offsetting is required, these bits should be set to zero. The following
table shows the range of offsets for the different highway data rates.
Highway Data Rate Time-Slot Offset Range
2.048 Mbits/s 0—31
4.096 Mbits/s 0—63
8.192 Mbits/s 0—127
Note:
A time slot is always 8 bits. A bit period is relative to the highway data rate
set for each highway.
RTSOFF, RBITOFF, and RFBOFF are used in conjunction to define the start of
the incoming frame. The values are added together to position the sampling of
time slot 0, bit 0.
Bit
7—3
2
Symbol
LC
Name/Description
Reserved.
Read as 0.
Loopback Control.
This bit is used to control the internal loopback of the TXD
highway to the corresponding RXD highway. When set to 1, the TXD highway as
input to this RXD highway. The transmit highway involved will be internally
looped back to the matching receive highway so that the TXD[i] output is now the
input to RXD[i]. When a particular highway is in this mode, the receive highway
offset must be 1/2-bit greater than the corresponding transmit highway offset.
When LC is cleared to 0, the RXD pin is the source of highway data (default).
Receive Highway Data Rate[1—0].
HDR1
HDR0
0
0
2.048 Mbits/s (default)
0
1
4.096 Mbits/s
1
0
8.192 Mbits/s
1
1
0.000 Mbits/s (idle, not receiving data)
All of the receive highways are grouped into pairs. RXD0 with RXD1, RXD2 with
RXD3, . . . , and RXD30 with RXD31. The maximum combined bandwidth for
each pair is 8.192 Mbits/s. Refer to Table 6, Rx Highway Data Rate Options, on
page 20 for highway rate combination.
1—0
HDR[1—0]
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