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Table of Contents
Troubleshooting
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Summary of Contents for Metrodata DC3445
- Page 1 DC3445 www.metrodata.co.uk Metrodata DC3445 User Manual Metrodata Ltd Fortune House Crabtree Office Village Eversley Way Egham Surrey TW20 8RY United Kingdom tel: +44 (0) 1784 744700 fax:+44 (0) 1784 744730 email: support@metrodata.co.uk Part No: 76-02-046D website: www.metrodata.co.uk/support...
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Page 2: Table Of Contents
CONTENTS INTRODUCTION About the DC3445 Safety Electromagnetic Compatibility Power Supply FCC Declaration Technical Overview Signal Transmission DESCRIPTION OF PARTS Rear panel Status display - rear panel Power Supply Unbalanced E3/DS3 Line port (BNC) Alarm Extension (RJ45) HSSI DTE Port INSTALLATION & SET-UP... -
Page 3: Introduction
1 INTRODUCTION 1. 1 About the DC3445 The DC3445 is used to connect high performance bridges and routers to high speed E3 or DS3 services. The DC3445 interfaces an E3 service (34.368 Mbps) or a DS3 service (44.736 Mbps) and Data Terminal equipment presenting a High Speed Serial Interface (HSSI). The E3/DS3 selection is made by setting a bit-switch mounted on the base of the unit. -
Page 4: Safety
INTRODUCTION 1. 2 Safety The DC3445 should not be connected to cabling which would be required by BS6701 to be equipped with over-voltage protection. The following ports are designated SELV (Safety Extra Low Voltage) within the scope of EN41003: HSSI port (DTE) -
Page 5: Technical Overview
(and therefore clocking information) and an average DC potential of 0V. The transmission rate is 34.368 Mbps for E3, and 44.736 Mbps for DS3 connections. The worst case delay through the DC3445 is 2 milliseconds, and the worst case round trip delay is 8 milliseconds. -
Page 6: Description Of Parts
DESCRIPTION OF PARTS 2 DESCRIPTION OF PARTS 2. 1 Rear panel All connections into and out of the DC3445 are made through the rear panel. The rear panel is shown in schematic form below. HSSI PORT Status ALARM Figure 2. 1 DC 3445 rear panel 2. -
Page 7: Unbalanced E3/Ds3 Line Port (Bnc)
DESCRIPTION OF PARTS 2. 4 Unbalanced E3/DS3 Line port (BNC) The network is connected to the BNC connectors at the rear of the unit as shown below : Function Signal Ring Shield Figure 2. 4 BNC connection Cable lengths should be restricted to those defined below: Cable E3 Max Length DS3 Max Length... -
Page 8: Hssi Dte Port
DESCRIPTION OF PARTS 2. 6 HSSI DTE Port The HSSI EIA613 DTE port is used to connect to the router. It consists of a female miniature 50-pin AMP connector, whose pins are described below. AMP connector, part number 749111-4 or should be used for connections to this port. Note: The HSSI port is regarded as a SELV port within the scope of EN 41003. -
Page 9: Installation & Set-Up
TEST CLOCK SELECT E3/DS3 ENABLE LOOP INTERNAL DS3 MODE LOOP E3 MODE OFF ON SPARE 17-08-199A Figure 3. 1 DC3445 Base Panel label Parameter Label Unit Options E3/DS3 E3/DS3 Enable Up Down DS3 Timing Clock select Position Internal or Loop... -
Page 10: E3/Ds3 Enable
INSTALLATION & SET-UP 3 . 1. 1 E3/DS3 Enable This switch is used to select the line (WAN) to be connected to the DC3445. Options are E3 or DS3. 3 . 1. 2 Timing The E3/DS3 Line TX clock is derived from the DTE using CCT 113 (TT: terminal timing). The HSSI specification requires this signal to be a non-gated version of CCT 114 (ST: send timing). -
Page 11: Connecting Up
Step 2: DTE Connect the DC3445 to the DTE using HSSI PORT on the rear panel. The DSU should ideally be placed close to the DTE, with no more than 2m of cable connecting the two. Step 3: E3/DS3 LINE (WAN) Connect the WAN by means either the two BNC bayonet connectors labelled LINE Rx and LINE Tx. -
Page 12: Alarms, Troubleshooting & Testing
ALARMS, TROUBLESHOOTING & TESTING 4 ALARMS, TROUBLESHOOTING & TESTING 4. 1 Alarms The Status LED on the DC3445 rear panel shows a variety of alarm conditions as shown in the table below. Status LED Meaning No mains power present Red steady... -
Page 13: Troubleshooting
Step 3: Bridge/Router configuration As the DC3445 is used in a variety of locations and with many different manufacturer’s equipment it is impossible for us to cover all eventualities here, so please consult other... -
Page 14: Test Loop
DTE port. This effectively isolates the DC3445 running the test and validates: (a) the local DTE cable if the local DTE recognises its own transmissions. (b) the remote DTE and its cable, the remote DC3445 and the LINE link if the remote DTE recognises its own transmissions. -
Page 15: Dc3445 Specifications
DC3445 SPECIFICATIONS 5 DC3445 SPECIFICATIONS 5. 1 DC3445 Product Specification Parameter Definition E3/DS3 LINE G.703 compliant, Sensitivity -10dB. Interface E3 Line coding HDB3. DS-3 Line coding B3ZS Interface type: 75 Ohm unbalanced coax, BNC connectors Jitter Tolerance Per G.823. Barrier EN 41003 compliant barrier provided on the E3/DS3 LINE interface. -
Page 16: Dc3445 Clocking Diagram
DC3445 SPECIFICATIONS 5. 2 DC3445 Clocking Diagram Internal Osc 15 ppm CCT 114 Line Tx CCT 113 CCT 115 Figure 5. 1 DC3445 Clocking diagram... -
Page 17: Glossary
Further, Metrodata Ltd reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Metrodata Ltd to notify any person of such revision or changes.
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