The DIN rail mountable 560NMD11 is a managed plug and play layer-2 switch providing 4 auto-negotiating fast Ethernet RJ45-ports with auto MDI/X (Automatic Crossover Detection and Correction), one 2-wire SDSL-port for use with private copper cables and one SFP (small form-factor pluggable) module slot for use with fiber optic transceivers. Ethernet may be distributed within a station through the 4 RJ45-ports of the switch.

The SDSL-port can be used for interconnecting stations with a maximum distance of 20 km (diameter of 0.8 mm) copper cable. Depending on the SFP-module equipped, the unit is able to span distances by fiber optic cable up to 40 km. The switch is able to provide redundant topologies by the (Rapid) Spanning Tree Protocol in one device.

Figure 1: Block diagram 560NMD11

For documentation purposes, the Ethernet ports are labeled from 1 to 4. The SDSL port is connected through a snap-in connector. There is no specific uplink port. All ports are equal in function. Link and speed status of each Ethernet and the SDSL port are displayed by status indicators on the right side (refer to Connectors and Indicators). SFP related indicators are positioned on the left side.

The switch learns Ethernet addresses by analyzing received frames and stores them in a lookup-table (max. 2048 entries), which is used to forward frames only to the correct port. If it is a broad- or multicast address or if the target address is not found in the lookup-table, a received frame is forwarded to all ports except the receiving one. If an entry in the lookup-table is not refreshed by an incoming frame with the specific source address, it is aged out within a maximum of 304 seconds (by default, value is configurable).

Regarding IEEE 802.1Q VLAN frames, the switch can be configured to VLAN or transparent mode. In transparent mode the switch will never change any frame or TAG of a frame; in VLAN mode it can be configured to support several applications like trunk or access ports.

Quality-of-Service is supported by the switch if an IEEE 802.1p compliant frame format is used. The switch can separate frames into up to four queues, which can be configured to priority based or weighted-fair queuing.

The 560NMD11 uses a wide range power supply and works with a voltage from 24 to 60 V.

The component itself, the Ethernet ports as well as the SDSL connection, the RS-232 interfaces, the SFP transceiver and the extension bus interface (Ext) are hot-plug capable.

The 560NMD11 switch consists of four equal RJ45 Ethernet ports, one SDSL transceiver, one SFP transceiver slot and two RS232 interfaces for configuration and tunneling of serial data. Each RJ45 port can be connected with a Cat. 3 (for 10 Mbps) or Cat. 5 (for 100 Mbps) Ethernet cable with a maximum length of 100 meters. The cable should only be used for in-house connections. Since Auto MDI/X is supported by the 560NMD11 switch for the RJ45 ports, there is no need for crossover cables.

The SDSL interface can be connected to 2-wire customer-owned copper lines. The maximum bridgeable distance is 20 km for 0.8 diameter copper cable with a transmission rate of 192 kbps. Depending on the distance, the transmission rate can be configured to up to 11 Mbps.

The status of the interfaces can be monitored by two LED indicators. For the Ethernet ports these are located at each above and below RJ45 jack.

Ethernet (RJ45)
A green Link LED (labeled L) indicates an active Ethernet connection.
Activity status:
– Off – No connection
– On – Ethernet connection established (Link)
– Flashing – Ethernet activity (transmission or reception of
frames)
A yellow Speed LED (labeled S) indicates a 100 Mbps connection.
Speed status:
– Off – Ethernet speed of 10 Mbps
– On – Ethernet speed of 100 Mbps

DSL (pluggable screw connector)
The state of the DSL interface can be monitored through the
green LEDs labeled Activity and Link.
Link status:
– Off – No DSL connection
– On – DSL link established
Activity status:
– Off – No DSL connection
– Flashing – DSL activity (transmission or reception of frames).
DSL connection negotiation if link is off.
A LED labeled Master shows the operational mode (Master
or Slave) of the DSL interface.
Master status:
– Off – Mode is Master
– On – Mode is Slave

RS-232 (RJ12)
The RS-232 interfaces can be monitored by the LEDs DCD
and Activity.
States of DCD:
– Off – DCD signal not active
– On – DCD signal active
Activity status:
– Off – No data send or received
– On – Data is being send or received

Fibre Optic (SFP)
For the SFP interface four indicators can be monitored. The
LEDs Module and Alarm define the state of the SFP slot.
States of Module:
– Off – Module not inserted
– On – Module inserted
Alarm status (Fo1, left side):
– Off – No module dependent alarm active
– On – Alarm relating to module active
The SFP Alarm is always active if the interface Fo1 is enabled
but no transceiver is inserted in the SFP slot.
The link and data transmission state can be monitored
through the green LEDs labeled Activity and Link.
Link status:
– Off – No connection through SFP established
– On – Link through SFP established
Activity status:
– Off – No activity
– Flashing – SFP activity (transmission or reception of frames).

General
Two additional LEDs labeled Power and Ready determine the
state of the device itself.
Power status:
– Off – Device has no power
– On – Device power is connected
Ready status:
– Off – Device is not operational
– On – Device is operational
Detected errors are signalized by a red Error LED (labeled Alarm, right side) together with an Alarm condition. The alarm condition can also be signalized by an isolated alarm relay. The conditions that lead to an alarm state can be configured.

An extension jack labeled (Ext) allows connection of additional hardware, e.g. a portable configuration stick for external storage of configuration data.

The 560NMD11 provides a total of six ports for use with end devices, switches, bridges, hubs and routers. While the 560NMD11 provides a single unit dsl-to-fibre conversion, the switch 560NMD01 or 500NMD02 may be used for copper only applications. Star, ring or line topologies can easily be built by this family of switches.

Redundant topologies are automatically detected and handled by the Rapid Spanning Tree Protocol (RSTP). This is fully backward compatible with the wide-spread Spanning Tree Protocol (STP).

Figure 2: Typical topology for use with 560NMD11

Management and configuration of the 560NMD11 can be performed by Telnet, Secure Shell (SSH), SNMP, RS232 or web interface. All methods can be used to either read or write parameters of the device.

Additionally the interface and alarm state of the device can be monitored by IEC 60870-5-101 or -104.

An existing configuration can be saved as well as restored. The configuration can also be stored to an external configuration stick (560NMA01), which supports the simple exchange of a device without trained personnel.

By default, the IP address for the configuration of a 560NMD11 switch is 10.0.0.2 with a subnet mask of 255.0.0.0 and a gateway of 10.0.0.1.Reset to default values could be done via RS232 interface, while press ‘i’ during startup process.. Connections for configuration purposes are accepted through any interface. All Ethernet ports are administratively up in default state.

The default setting for the RS-232 interfaces are baudrate 57600, 8 databits, no parity, 1 stopbit (57600, 8N1). The command line interpreter for configuration via this interface can be accessed by any terminal software (e.g. Hyperterminal).

Ports
All ports of the device can be disabled or enabled by configuration. Furthermore, the speed and duplex setting of any port can be set according to its capabilities. This is 10 or 100 Mbps, Full or Half duplex for the Ethernet ports and 192 kbps up to 11 Mbps in steps of 8 kbps for the SDSL port.

It is also possible to use an auto-detect setting. For the SDSL port it is recommended to set the 560NMD11 device closer to the control center to a fixed speed setting, while setting the communication partner at the RTU side to auto-detect.

The SFP port for use with fibre optic transceivers always works in 100 Mbps mode, Full or Half duplex. The parameters of the SFP (e.g. type, wavelength, range, receive power, …) may be read and monitored by the switch 560NMD11.

Ports connected to a RTU from RTU500 series should be configured with auto detect.

The switch supports a multiple of additional features, like port mirroring, bandwidth control, or quality of service.

The switch 560NMD11 supports various advanced functions like port mirroring, port rate limiting and quality-of-service (QoS).

All ports are equipped with frame counters, which are readable by management software.

Alerts, Notifications and Logging
The 560NMD11 provides Syslog and SNMP capabilities to send alerts and notifications to one or more predefined destinations.
There is also a relay for configurable out-of-band alerts.

For each Syslog server entry a severity can be entered to filter outgoing messages.

A system log stores critical messages. The log implements a timestamp either by uptime, or date and time if a time server is
configured.

For Syslog and local logging, a SNTP time server can be used to synchronize clocks and to enable the generation of date and time timestamps instead of uptime referencing messages.

Redundancy Support
The redundancy protocols Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP) are fully supported. Without configuration, RSTP is enabled for all ports. Switching from RSTP to STP is done automatically to ensure the compatibility to existing STP installations.

For every port, the (R)STP parameters can be configured separately. This includes port priority for root bridge control as well as point-to-point and edge connection settings. A global bridge priority is also settable.

Authentication
Access to the Telnet and SSH interface of the 560NMD11 is
controlled by a two-level password protection. The first level enables the user to access parameters in read-only mode and has to be entered as soon as a connection is established. To read and write parameters, the device has to be put in a configuration mode that requires an additional password. Optionally the passwords can be disabled. Some security sensitive information, such as the configuration file, is not available in read-only mode.

Besides the two-level password protection, users may be authenticated by a standard RADIUS server.

Udating…………..

In addition to the RTU500 series general technical data, the following applies: