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參數(shù)資料
| 型號： | DS26303LN-75 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3V, E1/T1/J1, Short-Haul, Octal Line Interface Unit |
| 中文描述： | 3.3，E1/T1/J1，短途，八線路接口單元 |
| 文件頁數(shù)： | 61/97頁 |
| 文件大?。?/td> | 966K |
| 代理商： | DS26303LN-75 |
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DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
61 of 97
6.4.5 Bipolar Violation and Excessive Zero Detector
The DS26303 detects code violations, BPV, and excessive zero errors. The reporting of the errors is done through
the pin RNEGn/CVn.
Excessive zeros are detected if eight consecutive 0s are detected with B8ZS enabled and four consecutive 0s are
detected with HDB3 enabled. Excessive zero detection is selectable when single-rail mode and HDB3/B8ZS
encoding/decoding is selected.
The bits in
EZDE
and
CVDEB
registers determine the combinations that are reported.
Table 6-9
outlines the
functionality:
Table 6-9. BPV, Code Violation, and Excessive Zero Error Reporting
CONDITIONS
CVn PIN REPORTS
BPV + code violation
BPV + code violation + excessive zero
BPV
BPV + excessive zero
EZDE is reset, CVDEB is reset
EZDE is set, CVDEB is reset
EZDE is reset, CVDEB is set
EZDE is set, CVDEB is set
6.4.6 LIU Receiver Front End
It is recommended that the receiver be configured as per
Table 6-4
and
Figure 6-4
. Internal or external mode for
the receiver front end can be selected by register
GC.RIMPMS
. When this bit is set to external mode the user is
required to supply two 15 resistors as shown in
Figure 6-4
. The internal adjust resistors A75, A100, and A110 will
still be set in external mode if 75 , 100 , or 110 impedance is selected during template selection. However, the
internal 30 resistor will be disconnected. If the user would like all the adjust resistors to be disconnected or any
internal impedance matching, then the user should set the
TS.RIMPOFF
bit for each LIU or the RIMPOFF pin when
in hardware mode.
6.5 Hitless-Protection Switching (HPS)
Many current redundancy protection implementations use mechanical relays to switch between primary and
backup boards. The switching time in relays is typically in the milliseconds, making T1/E1 HPS impossible. The
switching event likely causes frame-synchronization loss in any equipment downstream, affecting the quality of
service. The same is also true for tri-stating mechanisms that use software or inactive clocks for the triggering of
HPS.
The DS26303 LIU includes fast tri-statable outputs for TTIP and TRING and fast turn-off impedance matching for
the RTIP and RRING within less than one bit cycle. The control logic is shown in
Figure 6-5
. In software mode, the
user can set the RHPMC bit, which allows the OE pin to control both the transmitter outputs and the receive
impedance matching. This is a very useful function in that control can be done through a hardware pin, allowing a
quick switch to the backup system for both the receiver and the transmitter.
Figure 6-6
shows a typical HPS
application in software mode where the OE is used for control. In hardware mode, the receiver can have
impedance matching turned off quickly by using the RIMPOFF pin, and the transmitter output can be turned off
quickly by using the OE pin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS26303LN-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 |
| DS26303LN-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 |
| DS26303LN-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-XXX | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3.3V, E1/T1/J1, Short-Haul, Octal Line Interface Unit |
| DS26303LN-XXX+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3.3V, E1/T1/J1, Short-Haul, Octal Line Interface Unit |
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