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Summary of Contents for Metrodata DC3 00 Series
- Page 1 DC3X00 www.metrodata.co.uk Metrodata DC3X00 User Manual Metrodata Ltd Laxton House Crabtree Office Village Eversley Way Egham Surrey TW20 8RY United Kingdom tel: +44 (0) 1784 744700 fax:+44 (0) 1784 744701 email: support@metrodata.co.uk Part No: 76-02-044G website: www.metrodata.co.uk...
- Page 2 INTRODUCTION 1. 1 About the DC3X00 1. 2 Safety 1. 3 Electromagnetic Compatibility 1. 4 EN50022 Declaration 1. 5 FCC Declaration 1. 6 Power supply 1. 7 FCC Declaration 1. 8 Technical Overview 1 . 8. 1 G.703 Signal Transmission 1 .
- Page 3 INTRODUCTION 1 INTRODUCTION 1. 1 About the DC3X00 The DC3X00 is used to interface between a fractional E1 (2.048Mbit/s) Nx64K service and an X.21 or V.35 port which connects to a bridge or router. The model DC3000 has an X.21 interface, and the model DC3200 has a V.35 interface.
- Page 4 INTRODUCTION 1. 2 Safety The DC3X00 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: X.21 port V.35 port Fractional E1 Line port (BNC or RJ45) Alarm extension RJ45 port...
- Page 5 INTRODUCTION reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radiocommunications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at its own expense.
- Page 6 INTRODUCTION 1 . 8. 3 E1 Path Overhead 8 bits are used for path overhead and provide framing, alarm information, error detection and management. The bits of TS0 are used alternatively by the FAS and NFAS frames as follows: Bit No Function FAS Frame CRC bit...
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Page 7: Description Of Parts
DESCRIPTION OF PARTS 2 DESCRIPTION OF PARTS 2. 1 Rear panel All connections into and out of the DC3X00 are made through the rear panel. The rear panels are shown in schematic form below. ALARM Figure 2.1 DC3000 rear panel (100-250 VAC supply) Pin1 -48V L _ _... - Page 8 DESCRIPTION OF PARTS Notes: If the LED flashes red/green, disconnect the DTE (X.21 or V.35) signal to the DC3X00 in order to distinguish between LOF and AIS alarms. The loss of the DTE signal will then cause either the red/green/off or the green/red/off sequence to occur, depending upon the condition which has occurred.
- Page 9 DESCRIPTION OF PARTS 2. 4 Unbalanced E1 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 2.5 BNC connection Cable lengths should be restricted to those defined below: Cable Max Length (metres) UR202...
- Page 10 DESCRIPTION OF PARTS 2. 5 Balanced RJ45 E1 Line (Network) Port The layout of the female RJ45 network port mounted on the rear panel is shown below: Function Tx tip Tx ring Tx shield Rx tip Rx ring Rx shield Not connected Not connected Figure 2.7 RJ45 network port layout...
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Page 11: Locking Tab
DESCRIPTION OF PARTS 2 . 5. 2 Connecting to a network device A connection from the network port to a network device such as an E1 line or an NTU requires a crossover cable. Connections are defined in the table below. DSU port Network port Network port... - Page 12 DESCRIPTION OF PARTS 2 . 5. 4 Cable lengths and types Cable lengths should be restricted to those defined below: Cable Max Length (metres) Belden 8132 (28 AWG) Belden 9841 (24 AWG) Figure 2.11 Cable lengths Note: The total maximum attenuation of the cable attached to the network port must not exceed 6dB when measured at 1024 MHz.
- Page 13 DESCRIPTION OF PARTS 2. 7 X.21 DTE Port The X.21 DTE port is equipped with a 15-way female D-type connector in accordance with ISO 4903. The connections are shown below. Note: The X.21 port is regarded as a SELV port within the scope of EN 41003. Pin No Function Definition...
- Page 14 DESCRIPTION OF PARTS 2. 8 V.35 DTE Port The V.35 DTE port is equipped with a 34-way M rack female connector in accordance with ISO 4903. The connections are shown below. Note: The V.35 port is a SELV port within the scope of EN 41003. Function Definition CCT No.
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Page 15: Installation And Setup
There is an explanatory label on the unit’s base which defines the bit-switch set-up options and alarms. Metrodata Ltd TW20 8RY UK Tel +44 (0) 1784 744700... - Page 16 INSTALLATION & SET-UP 3 . 1. 1 Select RJ45/BNC This single switch is used to select which type of connector is to be used to connect the E1 line. 3 . 1. 2 CRC4 and T/S 16 bypass These two switches define whether CRC4 checking is to be done on the E1 line, and whether T/Slot 16 is to be bypassed.
- Page 17 INSTALLATION & SET-UP 3 . 1. 5 Setting Up Start T/S and Bandwidth The 5 binary switches for START TIMESLOT and BANDWIDTH permit numbers from 0-31 to be set-up. The decimal values of each switch are shown on the label. Thus, a START T/S of 11 and a BANDWIDTH of 4 would be set up as below.
- Page 18 INSTALLATION & SET-UP The tables below provide detailed timing definitions Clocking mode Bit switch E1 Transmit clock V.35 Transmit timing V.35 Receive timing position source Derived from Internal CCT114 CCT115 (Internal) oscillator Transmit timing A / B Receive timing A / B derived from internal derived from E1 line oscillator...
- Page 19 INSTALLATION & SET-UP 3. 2 Connecting up Safety Notice: Ports that are identified as SELV in this manual should only be connected to SELV ports on other equipment in accordance with EN 60950 clause 2.3. Step 1: Mounting. The DC3X00 is housed in a convenient 1U table top enclosure. Step 2: Set up bit-switches SW1 &...
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Page 20: Alarms, Troubleshooting & Testing
ALARMS, TROUBLESHOOTING & TESTING 4 ALARMS, TROUBLESHOOTING & TESTING 4. 1 Alarms The Status LED on the DC3X00 rear panel shows a variety of alarm conditions as shown in the table below. Status LED Meaning No mains power present Red steady Red/Off flashing LOS and DTE Alarm Red/Green flashing... - Page 21 ALARMS, TROUBLESHOOTING & TESTING 4. 2 Troubleshooting Step 1: Establish and verify the E1 WAN link Check the status LED on the rear panel of the unit at both ends of the link. If either is OFF, power is not present on that unit. Check the mains connection to the unit. If mains supply is satisfactory, we recommend that the unit be taken out of service and returned to a repair centre.
- Page 22 ALARMS, TROUBLESHOOTING & TESTING 4. 3 Test Loop LOCAL DC3000 REMOTE DC3000 Figure 4.3 Test loop on local DC3X00 Set the local DC3X00 base panel bit-switch labelled TEST LOOP to the ON position. When the TEST LOOP is activated at the local DC3X00, the signal received at the E1 port is passed directly back to the link at the line interface.
- Page 23 DC3X00 SPECIFICATIONS 5 DC3X00 SPECIFICATIONS 5. 1 DC3X00 Product Specification Parameter Definition E1 LINE Interface G.703 compliant, Sensitivity -10dB. Line coding HDB3. Interface types: 75 Ohm unbalanced coax (BNC) or 120 ohm balanced RJ45. Interface selected by bit-switch. Jitter Tolerance Per G.823.
- Page 24 DC3X00 SPECIFICATIONS 5. 2 DC3X00 Clocking Diagram Line Tx CCT 113 CCT 114 CCT 115 PLL = Phase locked loop Figure 5.1 DC3X00 Clocking diagram...
- Page 25 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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