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MT56DSU-R Owner's Manual
26
3.2.5 System Status
With this option enabled, the MT56DSU-R conditions the DSR
signal with additional parameters to provide added information to
the connected DTE concerning the Ready status of the
communications channel. Normally when this option is enabled, this
signal is on when the MT56DSU-R is powered on and not in test
mode.
On most modems, the Data Set Ready (DSR) signal at the DTE
interface is used to provide a basic indication of the modem actually
being ready to transfer data. The System Status option simply
provides a better means of informing the DTE of a ready condition.
The default for this function is System Status disabled, preventing
the DTE from interpreting momentary line interruptions as a
communications channel failure. (Refer to Chapter 2 for changing
the default DIP switch settings.)
3.2.6 Circuit Assurance
This option, when enabled, causes the MT56DSU-R to condition the
CTS signal to inform the DTE of the transmit ready status of the
entire communications channel.
In most installations, the CTS signal at the DTE interface is the
basic RTS signal delayed in time. Even though this could imply that
the communications channel is ready for data to be sent, it is not
typically conditioned by channel status to indicate an actual ready
status.
With the Circuit Assurance function enabled, the MT56DSU-R does
not turn the CTS signal on unless both the CD is on and the RTS/
CTS delay has timed out.
The default for this function is Circuit Assurance disabled. (Refer to
Chapter 2 forchanging the default DIP switch settings.)
82023101.p65 2/12/01, 2:52 PM26
- MultiDSU56K 1
- Owners Manual 2
- P/N 82023101, Rev. B 2
- Contents 3
- Appendixes 4
- Glossary 4
- 1.1 Introduction 6
- 1.2 About This Manual 6
- 1.3 Description 7
- 1.4 CSU/DSU Basics 8
- 1.4.1 DSU Functions 8
- 1.4.2 CSU Functions 8
- 1.5 Features 9
- Interconnection 10
- 1.7 Specifications 12
- 2.1 Introduction 16
- 2.2.3 RS232/V.35 Shunt 17
- 2.4 Installation Procedure 20
- 3.2 Options 24
- 3.2.1 Data Rate 24
- 3.2.2 Async/Sync 24
- 3.1 Introduction 24
- 3.2.3 Anti-Streaming 25
- 3.2.4 Elastic Store 25
- 3.2.5 System Status 26
- 3.2.6 Circuit Assurance 26
- 3.2.7 Clocking 27
- 3.2.8 RTS Forced On 27
- 3.2.9 DSR Forced On 28
- 3.2.10 Async Word Length 28
- 3.2.11 Normal/Diagnostics 28
- 3.3 LED Indicators 29
- 3.4 Functions 29
- 4.1 Introduction 32
- 4.2 LED Indicators 32
- 4.2.7 RTS Indicator 34
- 4.2.8 NS Indicator 34
- 4.2.9 TM Indicator 34
- 4.2.10 OOS Indicator 34
- 4.3 Diagnostic Tests 35
- 4.3.1 Local Loopback Test 35
- 4.3.2 Digital Loopback Test 36
- 4.3.4 Test Pattern Test 38
- 4.3.5 DSU Loopback Test 39
- 4.3.6 DSU Back-to-Back Test 40
- 5.1 Service 42
- 5.2 Limited Warranty 42
- 5.3 Tech Support and BBS 43
- Introduction 46
- RS232C DB9 CONNECTOR 50
- DESCRIPTION 50
- PIN IDENTIFICATION 50
- RS232C DB25S CONNECTOR 51
- V.35 INTERFACE ADAPTER CABLE 52
- SCHEMATIC 52
- LINE CABLE 53
- BUILD INSTRUCTIONS 53
- LOOPBACK CABLE 54
- BACK-TO-BACK CABLE 55
- 82023101 64
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Table des matières
Contents
11
FIGURE A
13
FIGURE 001
14
ACCESSORIES
14
FIGURE 100
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FIGURE 101
18
FIGURE 102
20
FIGURE 103
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FIGURE 104
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FIGURE 310
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FIGURE 400
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READER ASS'Y
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FIGURE 810
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FIXING ASS'Y
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FIGURE A10
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