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Digi 90031300 Restrictions on Daisy Chain Cable Lengths, Daisy Chain Cable Length vs. Baud Rate

Models: 90031300

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Restrictions on Daisy Chain Cable Lengths

The maximum length of a daisy chain is dependent upon the synchronous data rate. Table 8 lists the maximum cumulative daisy chain cable lengths for various baud rates. For example, to run a synchronous line at 10 megabaud, the total length of all daisy chain cables for that synchronous line may not exceed 30 feet. Thus, a single T1 Modem Bank could be placed 30 feet from the EPC/X host adapter, or six T1 Modem Bank units could be spaced at 5 foot intervals and still operate at 10 megabaud.

Table 8			Daisy Chain Cable Length vs. Baud Rate

	Baud Rate		Maximum Cable Length
			(24AWG Twisted Pair, 12 pF/foot)

	0	- 460K	2000 feet
	0	- 1.2M	1000 feet
	0	- 2.5M	300 feet
	0	- 5M	120 feet
	0	- 10M	30 feet

96	T1 Modem Bank

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Digi 90031300 manual Restrictions on Daisy Chain Cable Lengths, Daisy Chain Cable Length vs. Baud Rate

Contents

AccelePort T1 Modem Bank Page Table of Contents T1 Modem Bank Contents List of Figures List of Tables Regulatory Statements Federal Communications Commission FCC Statement Problems with your T1 Modem Bank FCC Part Industry Canada Compliance Statement AccelePort T1 Modem Bank Overview T1 Modem Bank Chassis, Front View T1 Modem Bank Shipping Carton Contents Unpacking Planning the T1 WAN Interface CSU ModeCarrier Approval Line Build Out CSU SpecificationT1 Cable Specification CSU Technical Description Parameters Specified to the Carrier Planning Worksheets Requirements for T1 Modem Bank SetupGeneral Information T1 Modem Bank Worksheet Type Number or Checkmark Description Hardware Installation T1 Modem Bank Power Supply Installation/Replacement Power Supply T1 Modem Bank Standalone or Rack Installation Standalone Installation Procedure Mounting Bracket Installation for a 24-inch Rack Requirements for Rack InstallationsBracket Position For 19-inch Rack Bracket Position For 24-inch Rack General Rack Installation Directions T1 Modem Bank Unit Spacer 735 Line Card Daisy Chaining T1 Modem Bank Units Synchronous Ports and Terminal Port Daisy Chain Example Two Daisy Chains of T1 Modem Banks to be Connected Locally Connecting a Modem Remote T1 Modem Bank Units Fault Tolerance Mixing EPC Concentrators with T1 Modem Bank Units Installing the PCI Host Adapter in your Computer EPC/X Host Adapter InstallationConfiguring the Host Adapter PCI Host Adapters DIP Switch Settings for I/O Port Address Setting the I/O Port AddressISA Host Adapters Installing the ISA Host Adapter in your Computer Factory-Set Jumper J1 Eisa Host Adapters Installing the Eisa Host Adapter in your ComputerSystem Configuration Factory-Set Jumpers Below 1 Megabyte Above 1 Megabyte Connecting the EPC/X Host Adapter to the T1 Modem Banks EPC/X Host Adapter Connected Locally to T1 Modem Banks Local and Remote T1 Modem Bank Units Software Installation and Configuration Setting the Node Number T1 Modem Bank Display Panel Installing Download Error Message Codes Post Failure Display Panel Status Indicators Possible ProblemRestarting Post Display Panel Status Codes Segment Meaning Description Display Severely Errored Software Installation for Novell Systems Introduction Installing Snmp Installing the EPC/X AIO Device DriverInstalling the AIO Application Installing QuickManager Load dgt1cfg.nlm Configuring the T1 Modem BanksMain Screen T1 Modem Bank Configuration Screen Installing the Windows NT Snmp Service Software Installation for Windows NT SystemsInstalling the EPC/X Windows NT Device Driver Windows NT Installing the Management Software Installing RASHost System Installation Remote System Installation ∙ QuickManager mode T1 Modem Bank ConfigurationConfiguring via QuickManager ∙ terminal port mode ∙ display panel mode Line Card Status Display Line Card Options Display Configuring via the Terminal Port Configuring via the Display Panel T1 Modem Bank Configuring via the Serial Port Interface Initial screen is shown below Configuration modification User selects short-haul for the span-type by entering T1 Modem Bank Equipment List System Information Modem Switchhook Status Alarm Status LOS T1 Modem Bank Diagnostics Running Diagnostics with QuickManager Modem Test Results Running Diagnostics from the Display Panel Running Diagnostics from the Terminal Port Press ? to see the configuration/diagnostic menu Diagnostics Test 1 Front Panel Test Diagnostic Test DescriptionsTest 3 Timer Test Test 2 RAM Test Test 5 Modem Test Test 4 Line Card TestTest 6 Sync Internal Loopback Test Test 8 Eeprom Test Test 7 Sync External Loopback TestTest 9 Watchdog Test Component Removal and Installation Component Level Troubleshooting Line Card Removal and Replacement Component Removal and Installation Modem Card Removal and Installation/Replacement Modem Card Removal Modem Card Types of Modem Cards Modem Revision Description Modem Card Installation/Replacement Quick Manager Modem Revision Screen T1 Modem Bank Power Supply Removal Power Supply Fan Assembly Removal and Replacement Fan Assembly Fuse Replacement AC Power Inlet Connections to the Telephone Network Functional Block Diagram of the T1 Modem Bank Alarms on a T1 SpanAlarm Reason for Alarm Result of Alarm T1 Modem Bank Interaction Physical Specifications T1 Modem Bank Power Cord Specifications Rack Specifications T1 Modem Bank Rack SpecificationsStandalone Unit Specifications T1 Modem Bank Environmental Requirements Terminator Plug Daisy Chain CablesT1 Loop Back Plug Emissions SafetyT1 Modem Bank Certification Telecom Glossary Glossary T1 Modem Bank Contention for Memory Addresses Appendix a Memory Conflicts EGA/VGA ROM Bios Typical PC Memory Usage 1st Megabyte Conflicts Between 8-Bit and 16-bit Memory Devices Eisa Host Adapters Wire, Internally Clocked Mode# Baud Rate Wire Synchronous Modem External Clock Mode# Baud Rate Wire, Self Clocked Mode# Baud Rate Appendix C Terminal Port Cable Signal Pin RJ-45 Plug Connector for Sync Channels Terminal Port Eight-Wire Direct Wiring Appendix E Generic T1 Modem Bank Wiring ModesEight-Wire Direct Daisy Chain Cable Wiring Four-Wire Direct Wiring Four-Wire Direct Daisy Chain Cable Wiring Daisy Chain Cable Length vs. Baud Rate Restrictions on Daisy Chain Cable LengthsBaud Rate Maximum Cable Length Eight-Wire Synchronous Modem Wiring RS-232 Synchronous Modem Cables RS-422 Synchronous Modem Cables Appendix F Modem AT Command Set Basic AT Commands Returned when n = 0 or Dn Dial CommandEn AT Command Echo Options Fn Online Echo Command no operation Mn Speaker Control dummy command Returned when n = 0, 1, 2, 3 orLn Speaker Volume dummy command Modem Identification O3-14 Sn? Read S Register n Enable Tone dialingReturned when n = 0, 1 or Vn Result Code Format Yn Dummy Command Zn Recall Stored Profile Cn Data Carrier Detect Option Async Only Load Factory SettingsBn Autoretrain Dn Data Terminal Ready Option Kn Set Flow Control Jn Dummy Command for AutoSyncGn Guard Tone Operation Ln Dial-Up/Leased-Line Option Rn CTS/RTS Option non-CTS Flow Control Mode Mn Select Sync, Async or AutoSync Mode OptionsQn Communications Mode Option Pn Dial Pulse Ratio Returned when n = 0, 3, 4, 5, 7 or Tn Self Test CommandsSn Data Set Ready Option Result Codes Returned when n = 0 or Vn View Active Configuration and Stored ProfileWn Store Active Profile Xn Sync Transmit Clock Source Yn Select Stored Profile on PowerupZn=x Store Telephone Number An Set Autoreliable Fallback Character AT% Percent CommandsGn Auto Fallforward/Fallback Enable Cn Data Compression AT\ Backslash Commands \Jn Constant DTE Speed Option \Kn Set Break Control \Qn DTE Flow Control Options \Tn Set Inactivity Timer\Nn Modem Protocol Options \Vn Protocol Result Code \Xn Set XON/XOFF Passthrough Option AT- Dash Commands JnSet V.42 Detection Phase Nn V.42bis Dictionary Size AT Quote CommandsHn V.42bis Compression Control On Select V.42bis Maximum String Length +FTS=n Class 1 FAX Commands+FTM=? FAX Normal Mode Transmit Capabilities +FRS=n 122 Supported FAX Transmit/Receive Modulations121 145 +FAA=n FAX Auto Answer Enable Class 2 FAX Commands+FAXERR T.30 Session Error Report Capability to Receive Data Bit Order SelectionCopy Quality Checking +FCTCRTY ECM Retry Count +FDCC FAX Capability Parameters +FDCS Current Session Results +FDFFC Data Compression Format Conversion Current Session Parameters Error Correction Mode Control Begin or continue Phase C Receive DataBegin Phase C Data Transmission Transmit Page Punctuation Phase C Received EOL Alignment +FPHCTO DTE Phase C Response Time-outPhase C Receive Data Block Size Phase C Transmit Data Block Size Class 2 FAX Responses Registers Register Definitions S11 Dtmf Duration and Interdigit Delay S8 Pause Time for Command or Dial ModifierS10 Lost Carrier Delay S6 Wait Before Dialing S12 Guard Time S14 Bit-Mapped Options S16 Bit-Mapped Option Status Address detector disabled S18 Modem Test TimerS19 AutoSync Protocol Support Mode Hdlc protocol 10 &D2 disconnect S21 Bit-Mapped OptionsR0 CTS follows RTS C1 DCD is on after connect 01 M1 is selected S22 Bit-Mapped Options10 L2 is selected 111 X4 is selected S23 Bit-Mapped Options DisabledS26 RTS to CTS Delay Interval T4 is selected 000 &Q0, &M0 is selected S30 Inactivity Timer ValueS27 Bit-Mapped Option L0 is selected S37 Desired DCE Speed N1 enabledJ1enabled S40 Bit-Mapped Option Status S47 Forced Sleep Timer with Powerdown Mode in Pcmcia EnabledS46 Automatic Sleep Timer 255 = 256 bytes = \A3 S50 FAX/Data Mode Selection S51 Data/FAX DTE Flow Control Selection S53 Modem Operating Mode \NnS57 V.42bis Dictionary Size see ATN Default = 011 &K3, \Q3 are selected %C1 is selected S62 DTE Rate Status Default = S58 Btlz String Length Default =S59 Bit-Mapped MNP Options Default = S65 Round Trip Delay 142 T1 Modem Bank Result Codes Display Format Options Extended Message Options Connect Ring Carrier 75/1200 Negotiation Progress MessagesCarrier Carrier 1200/75 Compression Class Compression V.42bis Protocol MNP 2 Index 150 T1 Modem Bank