參數(shù)資料
型號： DS26303L-75
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 數(shù)字傳輸電路
英文描述： 3.3V, E1/T1/J1, Short-Haul, Octal Line Interface Unit
中文描述： DATACOM, PCM TRANSCEIVER, PQFP144
封裝： 20 X 20 MM, 1.40 MM HEIGHT, MS-026, LQFP-144
文件頁數(shù)： 59/97頁
文件大?。?/td> 966K
代理商： DS26303L-75
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
59 of 97
6.4.2 Clock and Data Recovery
The resultant E1 or T1 clock derived from the 2.048/1.544 PLL (JACLK in) is internally multiplied by 16 by another
internal PLL and fed to the clock recovery system. The clock recovery system uses the clock from the PLL circuit to
form a 16-times oversampler, which is used to recover the clock and data. This oversampling technique offers
outstanding performance to meet jitter tolerance specifications.
6.4.3 Loss of Signal
The DS26303 uses both the digital and analog loss-detection method in compliance with the latest T1.231 for
T1/J1 and ITU G.775 or ETSI 300 233 for E1 mode of operation.
LOS is detected if the receiver level falls bellow a threshold analog voltage for a certain duration. Alternatively, this
can be termed as having received zeros for a certain duration. The signal level and timing duration are defined in
accordance with the T1.231 or G.775 or ETSI 300 233 specifications.
The loss-detection thresholds are based on cable loss of 15dB for both T1 and E1 mode. RCLK is replaced by
MCLK when the receiver detects a loss of signal if the AISEL bit is set in the
GC
register, or if the
IAISEL
.ILAISE bit
is set. The RPOS/RNEG data is replaced by an all-ones signal upon receiving an LOS to indicate AIS to the
downstream device. The loss state is exited when the receiver detects a certain number of ones density at a higher
signal level than the loss-detection level. The loss-detection-signal level and loss-reset-signal level are defined with
a hysteresis to prevent the receiver from bouncing between LOS and no-LOS states.
The following table outlines the specifications governing the loss function.
Table 6-5. Loss Criteria T1.231, G.775, and ETSI 300 233 Specifications
STANDARD
ITU G.775
No pulses are detected for
duration of 10 to 255 bit
periods.
CRITERIA
T1.231
ETSI 300 233
Loss
Detection
No pulses are detected for 175
±75 bits.
No pulses are detected for a
duration of 2048 bit periods or
1ms,
Loss Reset
Loss is terminated if a duration of
12.5% ones are detected over
duration of 175 ±75 bits. Loss is
not terminated if eight consecutive
0s are found if B8ZS encoding is
used. If B8ZS is not used, loss is
not terminated if 100 consecutive
pulses are 0.
The incoming signal has
transitions for duration of 10
to 255 bit periods.
Loss reset criteria is not
defined.
6.4.3.1
ANSI T1.231 for T1 and J1 Modes
Loss is detected if the received signal level is less than 200mV for duration of 192 bit periods. LOS is reset if the all
of the following criteria are met:
24 or more 1s are detected in a 192-bit period with a detection threshold of 300mV measured
at RTIP and RRING.
During the 192 bits less than 100 consecutive zeros are detected.
Eight consecutive 0s are not detected if B8ZS is set.
6.4.3.2
ITU G.775 for E1 Modes
LOS is detected if the received signal level is less than 200mV for a continuous duration of 192 bit periods. LOS is
reset if the receive signal level is greater than 300mV for a duration of 192 bit periods.
6.4.3.3
ETSI 300 233 for E1 Modes
LOS is detected if the received signal level is less than 200mV for a continuous duration of 2048 (1ms) bit periods.
LOS is reset if the receive signal level is greater than 300mV for a duration of 192 bit periods.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS26303L-75+ 功能描述:電信線路管理 IC 3.3V E1/T1/J1 Short Haul Octal LIU RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
DS26303L-75+A3 功能描述:電信線路管理 IC 3.3V E1/T1/J1 Short Haul Octal LIU RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
DS26303L-75A3 功能描述:電信線路管理 IC 3.3V E1/T1/J1 Short Haul Octal LIU RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
DS26303LN-120 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
DS26303LN-120+ 功能描述:電信線路管理 IC 3.3V E1/T1/J1 Short Haul Octal LIU RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
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