參數(shù)資料
型號: T7230A
廠商: Lineage Power
元件分類: 通信及網(wǎng)絡
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 29/110頁
文件大?。?/td> 752K
代理商: T7230A
Preliminary Data Sheet
June 1997
T7230A Primary Access Framer/Controller
25
Lucent Technologies Inc.
Frame Formats
The T7230A supports the North American T1 framing format of superframe (D4, SLC-96, and digital data service-
DDS) and extended superframe (ESF). The T7230A also supports the ITU CEPT-E1 basic format with and without
CRC-4 multiframe formatting. This section describes the various framing formats.
T1 Framing Structures
T1 is a digital transmission line that multiplexes twenty-four 64 kbits/s time slots (DS0) onto a serial link. The T1
system is the lowest level of hierarchy on the North American T-carrier system, as shown in Table 8.
Frame, Superframe, and Extended Superframe Definitions
Each time slot (DS0) is comprised of 8 bits sampled every 125
μ
s (8 kHz). Multiplexing 24 of these 8-bit samples
together produces a 192-bit (24 DS0s) frame. A framing bit is added to the beginning of each frame to allow for
detection of frame boundaries and the transport of additional maintenance information. This 193-bit frame, also
referred to as a DS1 frame, is repeated every 125
μ
s to yield the 1.544 Mbits/s T1 data rate. DS1 frames are bun-
dled together to form superframes and extended superframes as shown in Figure 8.
5-4559(F)r.1
Figure 8. T1 Frame Structure
Table 8. T-Carrier Hierarchy
T Carrier
T1
T1-C
T2
T3
T4
DS0 Channels
24
48
96
672
4032
Bit Rate (Mbits/s)
1.544
3.152
6.312
44.736
274.176
T1 Hierarchy
DS1
DS1C
DS2
DS3
DS4
FRAME 1
FRAME 2
FRAME 3
FRAME 24
FRAME 23
FRAME 1
FRAME 2
FRAME 11
FRAME 12
1
TIME SLOT 1
TIME SLOT 2
TIME SLOT 24
1
2
3
4
5
6
7
8
24-FRAME EXTENDED
SUPERFRAME
ESF = 3.0 ms
12-FRAME SUPERFRAME
SF = 1.5 ms
193-bit FRAME
DS1 = 125
μ
s
8-bit TIME SLOT
DS0 = 5.18
μ
s
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相關代理商/技術參數(shù)
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