Nortel Networks 553-3001-211 manual Cept transceiver, Dchi Configuration for NTAK93 only SW1

NTBK50 2.0 Mb PRI card Page 771 of 894

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 and G.732.

The transceiver provides transmit framing based on the 2.048 MHz clock derived from the DS-30X system clock and 1 KHz 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:

•receive data output

•transmit data input

•receive clock output

•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 D-Channel Handler Interface (DCHI) daughterboard. It is equivalent to a single port of an NTAK02 SDI/DCH card. The NTBK50 also supports a Downloadable D-Channel Handler interface (DDCH) daughterboard. The DDCH brings MSDL D-channel capability to the system.

DCHI Configuration for NTAK93 only (SW1)

The NTAK93 DCHI daughterboard can be operated in two separate modes 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 DPNSS

Circuit Card Description and Installation