Elcon LT2MSKU-T Operating Instructions Manual Download Page 5

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LT2MSKU-T

Version: 2008/05/23

Installation / mounting of LT2SMKU-T

The

LT2MSKU-T

can be used as wall-mounting or desktop unit.

Do not install the device in the neighbourhood of strong electromagnetic fields (i.e. close to
loudspeakers, TV-sets or the like), since radiation sources and interferences of such kind can
reduce the transmission range. Further, the place of installation should be protected from
direct sun radiation, heat sources and humidity and should also be dust-free, if possible.

If the

LT2MSKU-T

is used as desktop device, it should be placed on a plain and dry table

surface.

For mounting the device to the wall, use the existing casing pockets (key holes) to fix the
unit with help of the 3

35 screws and 6 mm dowels tension-free to a plain and dry wall

surface. Before inserting the dowels, make sure that there are no concealed supply lines in
the wall.

After connection of the signal cables, the device is ready for work.

To

put the sub-unit

LT2MSKU-T into operation,

the supply voltage has to be applied.

This is indicated by the green LED turning ON. The applied supply voltage and successful
initialization promptly start activation of the transmission line if a repeater ZWR or an
NT2MS has been connected. This will take a few seconds and is indicated by the flashing of
LED DSL1 (in two-pair mode also DSL2). Upon initial start-up, the system ramps up in
structured operating mode (default state).

Note: The disconnecting switch must be in

position „Operation“!

If the default state does not comply with the desired configuration,

the LT2MSKU-T and the NT2MS have to be reconfigured with help of the management
system. The configuration data are stored in the LT resp. NT as non-volatile information.

Short description

/ continued

The ISDN primary multiplex access uses the CRC-4 method as per ITU-T G.704 and G.706.
This ensures additional protection against faulty synchronization and allows to check the
transmission quality between the S2M interface (E1, G703) and the digital local exchange.

With the unstructured 2 Mbps fixed connection (D2MU, unstructured operating mode
(transparent mode)) the line terminating unit / network terminating unit

LT2MSKU-T

transmits the complete 2 Mbps signal, irrespective of the bit sequence, in both directions, i.e.
there is no frame synchronization against the 2 Mbps signal and no CRC4 application. The
received digital signals at the V2M interface (E1) are only checked with regard to existence,
HDB3 code error and AIS (Alarm Indication Signal).

A controlled loop (via Sa6 bits or SHDSL overhead) to be established close to the S2M
interface (E1) of the NT2MS permits in all modes of operation a distinct fault localization,
i.e. to recognize whether the failure belongs to the area of responsibility of the network
operator or, respectively, the subscriber. The

LT2MSKU-T

allows a loop close to the UKS

port(s). The activation (initiation) of the loop(s) is carried out with help of the MSP (Modu-
lar Service PC) with ENMS (ELCON Network Management Software) via the PC interface.

The various settings of the SHDSL can be configured with a PC per SHDSL overhead (EOC
channel) from the

LT2MSKU-T

. Local configuration of the SHDSL is possible via the PC /

RS232/V.24 interface. This requires a PC with respective ENMS software. Optionally, the
system can be configured as well by the DIL switches which are arranged on the circuit
board of the

LT2MSKU -T

. This means, configuration is executed for each system indi-

vidually.

Note:

Once the system has been configured via the EOC channel, the settings of the
DIL switches will have no effect!

For powering a regenerative repeater, an optionally available remote power supply module
(

FSP2M

) can be used, which can be integrated into the

LT2MSKU-T

. For this, the device

has to be opened (

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