Connection; Lan Ethernet Connection; Wan Or External Modem Connection; Isdn Connection - Teldat Atlas 250 Installation Manual

2 Installation

2.2 Connection

2.2.1 LAN Ethernet connection

The LAN interface has two female RJ45 connectors in order to connect to the Ethernet 10BaseT / 100BaseT net-
works through shielded twisted pairs (STP) or unshielded (UTP) cables. These cables are not supplied with the
equipment; please ask your supplier for information on this.
Depending on the design of the network, the connection is carried out through a HUB or directly to another terminal
device Ethernet interface through a crossover cable (please ask your supplier for information on crossover Ethernet
cables).

2.2.2 WAN or external modem connection

The DTE/DCE multistandard serial interfaces have a DB25 female connector in order to connect to an external mo-
dem or for connection to X.25, Frame Relay networks, etc.
Depending on the type of connection established, a different type of cable will be needed. This cable can be supplied
by Teldat if you wish.
On the underside on the device, there is a flap providing access to the sockets needed to insert the V.24 DTE/DCE,
V.35 DTE/DCE, X.21 DTE/DCE and RS-485 2/4 wire drivers. These drivers are not multi-purpose. The configura-
tion for the operation mode is carried out by inverting the position of the driver (labeled as "T" when acting as termin-
al and "M" for modem functions). The operation mode is the one indicated by the label closest to the connector. This
holds true for all drivers except for the RS-485, where you cannot change the modem or terminal behavior as this al-
ways has the same direction. The operating mode selection for 2 or 4 wires is carried out from the router's software
application through the configuration commands for the associated interface. This driver must always be connected
to 2W/4W with the arrow pointing towards the rear of the device, which is the closest to the external connection.
Note
The default configuration for the drivers (on leaving the factory) is indicated on a label located on the
underside of the device, close to the drivers access flap.
In the below figure you can see a given drivers configuration. WAN 1 operates in DCE mode and WAN 2 in DTE
mode.
Situation of the drivers depending on operating mode
Fig. 3:

2.2.3 ISDN Connection

The ISDN interface presents an RJ45 female connector to connect to the 4-wire S bus coming from the ISDN net-
work terminator (NT1 or TR1).
You can use a flat cable with RJ45 male connectors, provided with the device.
Passive-Bus terminal resistances
The Atlas 250 routers have a pushbutton (labeled as "TERM") in order to connect the BUS-S termination resist-
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Teldat S.A.
Atlas 250