Meridian Meridian 1 Option 11C Mini, Technical Reference Manual

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NTBK50 2.0 Mb PRI card Page 501 of 544
Option 11C and 11C Mini Technical Reference Guide
CEPT transceiver
The transmitter and receiver functions are used for synchronization, channel,
and signal extraction. The functions meet applicable specifications of the
CCITT recommendation G.703 & G.732.
The transceiver provides transmit framing based on the 2.048 MHz clock
derived from the DS-30X system clock and 1KHZ framing pulse.
Slip control
Slip control provides organized recovery of PCM when the clock recovered
from the external facility is at a different frequency with respect to the local
clock.
D-channel support interface
The D-channel support interface is a 64 kbps, full-duplex serial bit stream
configured as a DCE device. The data signals include: (1) Receive data
output, (2) transmit data input, (3) receive clock output, and (4) transmit clock
output. The receive and transmit clocks can be of slightly different bit rates
from each other as determined by the transmit and receive carrier clocks.
The NTBK50 supports a daughterboard D-channel handler interface (DCHI).
It is the equivalent to a single port of an NTAK02 SDI/DCH card. As well,
the NTBK50 supports a Downloadable D-channel handler interface (DDCH).
It will bring the MSDL D-channel capability into the Option 11C system.
DCHI Configuration for NTAK93 only (SW1)
The NTAK93 DCHI daughterboard 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. It can also operate in a U.K.
specific mode using the DPNSS format. The DDCH will support only a single
port which will directly interface to the PRI motherboard.
Table 157
Settings for the DCHI dip switch (SW1)
Switch Function On Off
S1-1 — — —
S1-2 F/W Mode DPNSS DCHI