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TELCOLINK DT - AccessDSL NTU
User Manual
Version: 2.5 Page 15 of 66
3.3 Nx64/RS232 Interface (DCE)
The following configuration options refer to the Nx64/RS232 (V.35/V.11/V.28/RS232
– SW
configurable) side only and do not affect the xDSL operating mode.
3.3.1 Nx64/RS232 Services
One can choose between three available services:

E1 only: With this service mode, the Nx64 interface is shut down. No payload data is
transferred to/from Nx64 transceiver.

Nx64 only: With this service mode, the E1 transceiver is shut down or is sending AIS. No
payload data is transferred to/from E1 transceiver.

Multiservice Nx64 & fE1: With this service mode, the available xDSL payload is divided into
Nx64 (or RS232) payload and E1 payload. The Nx64 payload always starts at timeslot 1
upwards, skipping timeslot 16 up to timeslot 31, and then using timeslot 16 and at last
timeslot 0. The E1 payload follows after the last used Nx64 timeslot. The RS232 payload
starts at timeslot that is defined by “RS232SLOT” command. For data rates from 110 to
38400 bps RS232 payload occupies one timeslot. For data rates 57600 and 115200 bps
RS232 payload occupies 2 and 3 timeslots accordingly.
3.3.2 Nx64/RS232 Interface Types
The following interface types/data rates are supported (SW configurable):

V.35 / 64…2048 kbps;

V.11 (V.36 or X.21, cable selectable) without t
ermination / 64…2048 kbps;

V.11 (V.36 or X.21, cable selectable) with termination / 64…2048 kbps;

V.28 (synchronous) / 64 and128 kbps;

RS232 (asynchronous) / 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600
and 115200 bps.
3.3.3 Nx64 Clock Directions (V.35, V.11 and V.28 only)
There are two options available:

codirectional: Transmit clock and transmit data have same directions, i.e. both are inputs to
the modem at signal number 113 (clock) and 103 (data).

contradirectional: Transmit clock and transmit data have opposite directions, i.e. transmit
clock is output from modem at signal number 114 and transmit data is input to the modem at
signal number 103.
3.3.4 Nx64 Clock Modes (V.35, V.11 and V.28 only)
The following table shows different combinations of clock modes, some of which are invalid.
There are three possible DCE clock modes:

from E1: This clock mode is active when the E1 interface is active.

external: In this clock mode, the DCE is clock slave and has its PLL on the transmit side
(from Nx64 to the xDSL interface) is on.

internal: In this clock mode, the DCE is clock master and the PLL is off, generating a
2048 kHz clock from the internal oscillator directly.