參數(shù)資料
型號(hào)： XRT81L27IV
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
中文描述： DATACOM, PCM TRANSCEIVER, PQFP128
封裝： TQFP-128
文件頁(yè)數(shù)： 28/30頁(yè)
文件大小： 194K
代理商： XRT81L27IV
XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. 1.1.0
á
26
3.4
After the incoming line signal has passed through the
Receive Equalizer block, it will next be routed to the
Slicer block. The purpose of the Slicer block is to
quantify a given bit-period (or symbol) within the in-
coming line signal as either a “1” or a “0”.
3.5
T
HE
LOS D
ETECTOR
BLOCK
The LOS Detector block, within each channel (of the
XRT81L27) was specifically designed to comply with
the LOS Declaration/Clearance requirements per
ITU-T G.775. As a consequence, the channel will de-
clare an LOS Condition, (by driving the LOS output
pin “High”) if the received line signal amplitude drops
to –20dB or below. Further, the channel will clear the
T
HE
P
EAK
D
ETECTOR
AND
S
LICER
B
LOCK
LOS Condition if the signal amplitude rises back up to
–15dB typically, or above. The XRT81L27 was de-
signed to meet the ITU-T G.775 specification timing
requirements for declaring and clearing the LOS indi-
cator. In particular, the XRT81L27 will declare an LOS
between 10 and 255 UI (or E1 bit periods) after the
actual time the LOS condition occurred. Further, the
XRT81L27 will clear the LOS indicator within 10 to
255 UI after restoration of the incoming line signal.
When operating in the Host mode, the LOS time can
be extended to 4096 zeros by the activation of the
EXLOS bit in the Command Control Register. This
will provide for those cases where the G.775 specifi-
cation value is not long enough,
相關(guān)PDF資料
PDF描述
XRT81L27 Seven Channel E1 Line Interface Unit with Clock Recovery(7通道 E1線接口單元（帶時(shí)鐘恢復(fù)）)
XRT82D20 Single Channel E1 Line Interface Unit(單通道E1線接口單元)
XRT82L24IV QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
XRT82L24 Quad E1 Line Transceiver with Clock Recovery and Jitter Attenuator(四E1線收發(fā)器（帶時(shí)鐘恢復(fù)和振動(dòng)衰減器）)
XRT82L34 Quad T1/E1/J1 Line Transceiver with Clock Recovery and Jitter Attenuator(四 T1/E1/J1線收發(fā)器（帶時(shí)鐘恢復(fù)和振蕩衰減器）)
相關(guān)代理商/技術(shù)參數(shù)
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XR-T8205CP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Ringer
XR-T8205P 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Ringer
XRT82D20 制造商:EXAR 制造商全稱:EXAR 功能描述:SINGLE CHANNEL E1 LINE INTERFACE UNIT
XRT82D20_06 制造商:EXAR 制造商全稱:EXAR 功能描述:SINGLE CHANNEL E1 LINE INTERFACE UNIT
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