Metrodata DC3 00 Series User Manual Download Page 24

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PLL = Phase locked loop

Line Tx

CCT 115

CCT 114

CCT 113

DTE

DC3X00 SPECIFICATIONS

5. 2 DC3X00 Clocking Diagram

Figure 5.1 DC3X00 Clocking diagram

Summary of Contents for DC3 00 Series

Page 1: ...C3X00 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 7...

Page 2: ...g to a terminal device 8 2 5 2 Connecting to a network device 9 2 5 3 RJ45 Connector layout 9 2 5 4 Cable lengths and types 10 2 6 Alarm Extension RJ45 10 2 7 X 21 DTE Port 11 2 8 V 35 DTE Port 12 3 I...

Page 3: ...nects to a bridge or router The model DC3000 has an X 21 interface and the model DC3200 has a V 35 interface Both models are described in this manual There is a choice of either BNC or RJ45 connectors...

Page 4: ...igital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment Th...

Page 5: ...ansmitted as a positive pulse a negative one and then another positive one The pulses have a duration of 50 so that strings of 1s can be identified as a series of pulses This is because clocking infor...

Page 6: ...he utilisation of bandwidth Timeslots used must form a contiguous block The total number of timeslots allocated must be less than or equal to 31 or 30 if Timeslot 16 is by passed If Timeslot 16 by pas...

Page 7: ...panel 48VDC supply 2 2 Status display rear panel There is a status LED on the right hand side of the rear panel which indicates the status of the unit as shown in the figure below Figure 2 3 Rear pan...

Page 8: ...s provided ex factory with a 250mA internal fuse Mains power is connected via the IEC inlet on the rear of the unit An alternative 48VDC powered unit is available The input voltage and current ranges...

Page 9: ...to those defined below Figure 2 6 Cable lengths Note The total maximum attenuation of each of the cables attached to the network port must not exceed 6dB when measured at 1 024 MHz The frequency atte...

Page 10: ...X is straight through Connections are defined in the table below Figure 2 8 Connection from DSU to terminal device Pin Function 1 Tx tip 2 Tx ring 3 Tx shield 4 Rx tip 5 Rx ring 6 Rx shield 7 Not conn...

Page 11: ...t Figure 2 4 shows both the plug and socket head on so that any connecting wires are behind the connector The connector numbering is shown 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 LOCKING TAB Figure 2 10 RJ45...

Page 12: ...tension RJ45 The alarm extension is an RJ45 female socket mounted on the rear panel of the unit It allows the connection of major and minor alarm relay contacts to a remote indicator such as a bell or...

Page 13: ...f EN 41003 Figure 2 13 X 21 DTE port connector layout Pin No Function Definition CCT No 1 Chassis Shield 101 2 Tx A Transmit A 103 3 C A Control A 107 4 Rx A Receive A 104 5 I A Indication A 109 6 S A...

Page 14: ...on CCT No A Chassis Chassis ground 101 B Ground Signal ground 102 C RTS Request to send 105 D CTS Clear to send 106 E DSR Data set ready 107 F DCD Data Carrier detect 109 H DTR Data terminal ready 108...

Page 15: ...uk Metrodata Ltd TW20 8RY UK Tel 44 0 1784 744700 Fax 44 0 1784 744730 SW1 SW2 16 8 4 2 1 START T S 16 8 4 2 1 BANDWIDTH SW1 SW2 17 08 115C CLOCK SELECT INT TERM LOOP BYP16 CRC4 ON OFF SELECT RJ45 BNC...

Page 16: ...est for data errors Note that FALLBACK can occur from G 704 CRC4 mode Fallback is a mechanism used in a CRC4 environment which allows G 704 framing to be maintained in the presence of high levels of C...

Page 17: ...LOOP E1 loop timing TERM Terminal i e V 35 X 21 transmit is supplied by terminal device or DTE MODE where the terminal device supplies timing for both directions of transmission Note that when using T...

Page 18: ...CCT114 Transmit timing A B derived from E1 line received clock CCT115 Receive timing A B derived from E1 line received clock TERM Terminal 01 Derived from CCT 113 Terminal timing A B CCT 113 Terminal...

Page 19: ...ctor DC3200 labelled DTE 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 E1 LINE WAN Connect the WAN by means of either...

Page 20: ...hing AIS and DTE Alarm Green Red Off flashing LOF and DTE Alarm Green Off flashing DTE Alarm Green steady Status OK Alarm Alarm Definition Response LOS Loss Of Signal No data and therefore no clocking...

Page 21: ...le continuity and network connections etc Step 2 Establish and verify the DTE link If the status LED flashes RED GREEN this indicates that either an LOF or AIS Alarm is present In order to distinguish...

Page 22: ...fectively isolates the DC3X00 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 DC3X00 and the E1 link if...

Page 23: ...15 way female DA15 per ISO 4903 V 35 34 way female M rack Clocking options E1 Line Internal Terminal DTE TT circuit 113 Loop E1 line receive clock DTE Mode E1 transmit clock slaved to CCT113 with X 2...

Page 24: ...PLL Phase locked loop Line Tx CCT 115 CCT 114 CCT 113 DTE DC3X00 SPECIFICATIONS 22 5 2 DC3X00 Clocking Diagram Figure 5 1 DC3X00 Clocking diagram...

Page 25: ...data Ltd to notify any person of such revision or changes Trademarks The Trademarks of other Corporations which may be used in this manual are hereby ac knowledged Copyright 2004 by Metrodata Ltd All...

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