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RFL Communications SMX3 User Manual

X.21 / v.24 dual-protocol sub-rate multiplexer
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SMX3 / 21 Sub-MUX
X.21 / V.24 Dual-Protocol sub-rate multiplexer
User Manual
Issue 1.4

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Summary of Contents for RFL Communications SMX3

  • Page 1 RFL Communications plc SMX3 / 21 Sub-MUX X.21 / V.24 Dual-Protocol sub-rate multiplexer User Manual Issue 1.4...

  • Page 2: Table Of Contents

    19 February 2009 Initial Release 04 March 2009 Applicable Firmware release smx-2-1-0-1.mcs Example configurations added, timing details expanded 07 May 2009 Loopback schematics added 08 June 2009 RFL SMX3 / 21 Page 2 of 22 Issue 1.4 User Manual 08 June 2009...

  • Page 3: Introduction

    RFL developed a four channel sub-multiplexer to support operation of their MPR – LZPK102 protection relays and SCADA systems over leased digital circuits. The requirements for this multiplexer is described in SMX3/40 Sub-MUX X.21 High speed sub-rate multiplexer User Manual Release 2.01.

  • Page 4: Concatenation And Network Timing

    SMX3/21 will operate on a network of concatenated X.21 links. A facility is provided so that two co-located SMX3/21 (i.e. one at each end of separate X.21 links) units can be linked ‘back to back’. This feature is referred to as Aggregate Concatenation.

  • Page 5: Channel Characteristics

    Transparent Mode is a high speed configuration for the V.24 ports particularly suited to applications for protection relays. The end to end delay in this mode is less than 0.5s (excluding delays introduced by the comms link). RFL SMX3 / 21 Page 5 of 22 Issue 1.4...

  • Page 6: Aggregate Port

    Timing network (X). Special applications only. Requires to be enabled using mode DTE + Timing X enabled Screen / Drain Must be earthed to shell RFL SMX3 / 21 Page 6 of 22 Issue 1.4 User Manual 08 June 2009...
  • Page 7 In either configuration, use 6 pair plus ground stranded cable with overall shield (eg RS 111-8994). Maximum recommended length in substations - 10m (Check Utility standards). DIP switches provide configuration options, see section 10. RFL SMX3 / 21 Page 7 of 22 Issue 1.4 User Manual...

  • Page 8: Concatenation Port

    Aggregate Concatenation Aggregate Concatenation is the interconnection at aggregate level of two co-located SMX3/21 units. For this function the Concatenation Port is configured as Enabled as Concatenation mode, (i.e. DTE with Timing X enabled). The timing signal is derived from the port and is transmitted on pins 7 and 14 (Xa and Xb).
  • Page 9 Aggregate Concatenation Screen / Drain Must be earthed to shell Aggregate Concatenation to a co-located SMX3/21 requires a five twisted pair cross- over cable with overall shield (eg RS 111-8988). Maximum recommended length 10m (check Utility standards). Aggregate Concatenation Cable D15M –...

  • Page 10: Data Port (Channel A)

    When DIP SW 1-2 is set to Remote, I is ON when the channel is legally configured, the aggregate is running and in sync, and C is received from the remote end. RFL SMX3 / 21 Page 10 of 22 Issue 1.4...

  • Page 11: Data Ports (Channels B & C)

    Where multiple V.24 ports are assigned to a channel (on one or multiple SMX3/21 units), data from the channel is presented at RxD of all ports other than the source of the data, and data to the channel is an ‘or’ function of TxD of those ports where RTS is asserted ON.
  • Page 12 V.24 Data Channel Concatenation SMX3/21 units co-located at one end of adjacent unsynchronised links may be concatenated at the V.24 level either through the connected equipment, or directly using a crossed RS232 data cable. V.24 Port Performance V.24 circuits operate to emulate a modem: CTS follows the state of local RTS after any necessary delay, when the Aggregate is working and in synchronism.

  • Page 13: Dip Switches

    V.24 Data Not used Concatenation Timing configuration configuration configuration enabling configuration Setting data is in the following tables. Refer to Section 14 for example configurations. RFL SMX3 / 21 Page 13 of 22 Issue 1.4 User Manual 08 June 2009...
  • Page 14 When set to Remote, I is ON when the channel is legally configured, the aggregate is running and in sync, and C is received from the remote end • Channel Enable. Set to On to enable Channel A X.21 Data Channel RFL SMX3 / 21 Page 14 of 22 Issue 1.4 User Manual...
  • Page 15 When Async 8 or Async 9 mode is selected, set the baud rate to match the connected equipment. 9600 bits/s requires allocation to a 32kHz sampling channel. Do not set different baud rates for ports allocated to the same aggregate channel. RFL SMX3 / 21 Page 15 of 22 Issue 1.4...
  • Page 16 - In Concatenation mode the clock is sourced from the unit at the opposite end of the link, so an SMX3/21 must be present at each end of the concatenation link. RFL SMX3 / 21 Page 16 of 22 Issue 1.4...
  • Page 17 • Timing source: X.21 Port, Concatenation Port, Master, Auto, X.21 is the normal setting for applications where the SMX3/21 X.21 port is connected to a service synchronised with the network master clock. Concatenation Port is the setting used when an X.21 link needs to be synchronised to the network master clock signal from an adjacent link.

  • Page 18: Leds

    No clock present Steady Bit timing locked to Master Clock - Healthy Aggregate frame not synchronised Green Aggregate frame synchronised - Healthy Yellow Yellow alarm (remote alarm) RFL SMX3 / 21 Page 18 of 22 Issue 1.4 User Manual 08 June 2009...

  • Page 19: Power Input

    12. Power Input Power input is 48 Vdc nominal. (24V – 72V range). SMX3/21 can be connected to positive earth, negative earth or floating supplies. The power connections P1 and P2 are not polarity sensitive, but when using a grounded supply, the 0V leg must be connected to P2. (See table) A 500mA fuse (5 x 20mm) is in the rail connected to the P1 terminal.

  • Page 20: Example Configurations

    Ch C Ch A Ch B Ch C Port Port Port Port Port Port Substation A Substation B DIP Switch Settings for both units Not used RFL SMX3 / 21 Page 20 of 22 Issue 1.4 User Manual 08 June 2009...
  • Page 21 Port Port Substation A Substation B Substation C DIP Switch Settings for A1, C1 Not used DIP Switch Settings for units B1, B2 Not used RFL SMX3 / 21 Page 21 of 22 Issue 1.4 User Manual 08 June 2009...

  • Page 22: Blank Setting Table

    Avon Way Langley park CHIPPENHAM Wilts SN15 1GG www.rflcomms.co.uk Installation and Technical Support: Phone +44 (0) 1249 446500 Fax +44 (0) 1249 446506 e-mail support@rflcomms.co.uk RFL SMX3 / 21 Page 22 of 22 Issue 1.4 User Manual 08 June 2009...

This manual is also suitable for:

21 sub-muxSmx3 / 21 sub-mux

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