參數(shù)資料
型號: XRT86VL3X
廠商: Exar Corporation
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): 57/149頁
文件大小: 1274K
代理商: XRT86VL3X
XRT86VL3X
50
REV. 1.2.0
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
5.1.3
Cable Loss Indicator
The ability to monitor the cable loss attenuation of the receiver inputs is a valuable feature. The XRT86VL3x
contains a per channel, read only register for cable loss indication. CLOS[5:0] is a 6-Bit binary word that
reports the value of cable loss in 1dB steps with an absolute accuracy of ±1dB. An example of -25dB cable
loss attenuation is shown in
Figure 53
.
5.2
Receive Sensitivity
To meet Long Haul receive sensitivity requirements, the XRT86VL3x can accept T1/E1/J1 signals that have
been attenuated by 43dB cable attenuation in E1 mode or 36dB cable attenuation in T1 mode without
experiencing bit errors, LOF, pattern synchronization, etc. Short haul specifications are for 12dB of flat loss in
E1 mode. T1 specifications are 655 feet of cable loss along with 6dB of flat loss in T1 mode. The XRT86VL3x
can tolerate cable loss and flat loss beyond the industry specifications. The receive sensitivity in the short haul
mode is approximately 4,000 feet without experiencing bit errors, LOF, pattern synchronization, etc. Although
data integrity is maintained, the RLOS function (if enabled) will report an RLOS condition according to the
receiver loss of signal section in this datasheet. The test configuration for measuring the receive sensitivity is
shown in
Figure
.
F
IGURE
52. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
E
QUALIZER
AND
P
EAK
D
ETECTOR
F
IGURE
53. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
C
ABLE
L
OSS
I
NDICATOR
Peak
Detector &
Slicer
Rx Equalizer
Rx Equalizer
Control
RTIP
RRING
-25dB of Cable
Loss
Equalizer and
Peak Detector
CLOS[5:0] = 0x19h
(25dec = 19hex)
-25dB Attenuated
Signal
Read Only
XRT86VL3x
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