参数资料
型号: DS3150TN
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Interface
英文描述: DATACOM, PCM TRANSCEIVER, PDIP48
封装: TQFP-48
文件页数: 16/22页
文件大小: 228K
代理商: DS3150TN
DS3150
3 of 22
Applicable Standards Table 1A
T1.102-1993
(ANSI) “Digital Hierarchy – Electrical Interfaces”
T1.107-1995
(ANSI) “Digital Hierarchy - Formats Specification”
T1.231-1997
(ANSI) Draft “Digital Hierarchy - Layer 1 In-Service Digital Transmission
Performance Monitoring”
T1.231-1993
(ANSI) “Digital Hierarchy - Layer 1 In-Service Digital Transmission Performance
Monitoring”
T1.404-1994
(ANSI) “Network-to-Customer Installation - DS3 Metallic Interface Specification”
GR-499-CORE
(Bellcore) Issue 1, December1995 “Transport Systems Generic Requirements
(TSGR): Common Requirements”
GR-253-CORE
(Bellcore) Issue 2, December 1995 “SONET Transport Systems: Common
Generic Criteria”
G.703, 1991
(ITU) “Physical/Electrical Characteristics of Hierarchical Digital Interfaces
G.751, 1993
(ITU) “Digital Multiplex Equipment Operating at the Third Order Bit Rate of
34,368 kbit/s and the Fourth Order bit Rate of 139,264 kbit/s and Using Postive
Justification”
G.823, 1993
(ITU) “The Control of Jitter and Wander Within Digital Networks Which are
Based on the 2048 kbit/s Hierarchy”
G.775, 1994
(ITU) “Loss Of Signal (LOS) and Alarm Indication Signal (AIS) Defect Detection
and Clearance Criteria”
O.151, 1992
(ITU)“Error Performance Measuring Equipment Operating at the Primary Rate and
Above”
TBR 24, 1997
(ETSI) “Business TeleCommunications; 34Mbit/s digital unstructured and
structured lease lines; attachment requirements for terminal equipment interface
ETS 300 687, 1996
(ETSI) “Business TeleCommunications; 34Mbit/s digital leased lines (D34U and
D34S); Connection characteristics
ETS 300 686, 1996
(ETSI) “Business TeleCommunications; 34Mbit/s and 140Mbits/s digital leased
lines (D34U, D34S, D140U and D140S); Network interface presentation
RECEIVER
The DS3150 interfaces to the receive T3/E3/STS-1 coax line via a 1:2 step up transformer. See
Figure 1B. The receiver automatically adapts to coax cable loses from 0 to 15 dB which translates into
0 to 380 meters (T3) or 440 meters (E3) or 360 meters (STS-1) of coax cable (AT&T 734A or
equivalent). The receiver has the ability to interface to monitor jacks as well. Via the RMON input (see
Table 2A), the device can be configured to insert a 20 dB flat boost into the incoming signal. Monitor
jacks typically have series resistors that result in a resistive loss of 20 dB. The receiver has excellent
jitter tolerance characteristics. See Figure 1C.
The receiver contains both analog and digital loss-of-signal detectors. The analog loss of signal detector
resides in the equalizer. If the incoming signal drops below –24 dB of the nominal signal level, the
analog loss-of-signal detector will activate and it will step on the recovered data and force all zeros out of
the data recovery circuitry. The analog loss-of-signal detector will not clear until the signal level is above
-18 dB of the nominal signal level. The digital Loss of Signal (LOS) detector is activated when it detects
192
±1 consecutive zeros. LOS is cleared when there are no Excessive Zero occurrences over a span of
192
±1 clock periods. An Excessive Zero occurrence is defined as 3 or more consecutive zeros in the T3
and STS-1 modes and 4 or more zeros in the E3 mode. The status of the digital LOS is reflected at the
LOS* output (see Table 2A). There is no status output available for the analog loss-of-signal detector.
While the device is in a loss-of-signal state, the RCLK output will be referenced to the MCLK input (or
the TCLK input if MCLK is high/floating or to the internal oscillator if MCLK is tied low). The analog
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