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參數(shù)資料
| 型號： | T7698 |
| 廠商： | Lineage Power |
| 英文描述： | Quad T1/E1 Line Interface and Octal T1/E1 Monitor(四T1/E1線接口和八T1/E1監(jiān)控器) |
| 中文描述： | 四T1/E1線路接口和八路的T1/E1監(jiān)視器（四個T1/E1線接口和八T1/E1的監(jiān)控器） |
| 文件頁數(shù)： | 51/112頁 |
| 文件大小： | 1359K |
| 代理商： | T7698 |
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Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
51
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
The T7698 supports the North American T1 framing format of superframe (D4, SLC-96, DDS), extended super-
frame (ESF), and the ITU CEPT/E1 basic format with and without CRC-4 multiframe formatting. This section
describes the framing formats.
T1 Framing Structures
T1 is a digital transmission line which 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 29.
Table 29. T-Carrier Hierarchy
Frame, Superframe, and Extended Superframe Definitions.
Each time slot (DS0) is comprised of 8 bits sam-
pled every 125 μs (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 μs
to yield the 1.544 Mbits/s T1 data rate. Twelve DS1 frames are bundled together to form a superframe and 24 DS1
frames are bundled together to form an extended superframe.
5-4559(F)r.2
Figure 18. T1 Frame Structure
T Carrier
DS0 Channels
Bit Rate (Mbits/s)
Signal Hierarchy
T1
T1-C
T2
T3
T4
24
48
96
672
4032
1.544
3.152
6.312
44.736
274.176
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 μs
8-bit TIME SLOT
DS0 = 5.18 μs
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