Card-Lan Interface - Nortel Enterprise 1000 Reference Manual

Page 178 of 236
Table 49
Settings for the DCHI dip switch (SW1)
Switch
S1-1
S1-2

Card-LAN interface

553-3023-211 Standard 1.00 June 2001
NTAK79 2.0 Mb PRI card
The NTAK79 has an onboard D-Channel Handler Interface (DCHI). It is the
equivalent to a single port of an NTAK02 SDI/DCH pack. This allows for a
completely operational ISDN PRA link with clock synchronization and D-
channel on a single circuit card.
The onboard D-channel has one status LED on the NTAK79 faceplate to
indicate enabled/disabled states. See Table 41 on page 169.
The on-board DCHI can be operated in two separate modes as defined by an
on-board dip switch. It can operate in a standard DCHI mode common to
most ISDN standard countries. The U.K. specific mode that uses the DPNSS
format is not supported at this time.
Function
En/Dis
F/W Mode
DCHI special applications connection
The connection between the PRI2 and the on-board D-channel Handler
Interface card is also available at the MDF connector. Connections are made
to these pins for normal on-board DCHI operation. They can also be used for
future or special applications.
The signals conform to the EIA RS-422 standard.
A Dual Port UART handles the functions of the serial ports for the Card-LAN
serial link and the echo canceller/test port interface. The echo/test interface is
an asynchronous 4800 bps 8-bit connected to port A of the UART. The card-
LAN interface is an asynchronous 19.2 kbps 9 bit start/stop connected to port
B of the UART.
The connection to the echo canceler/test port is available at the backplane/
MDF connector. The signals at this port conform to the EIA RS-232C
standard.
On
Enabled
DPNSS (not sup-
ported at this time)
Off
Disabled
DCHI