Signaling Interface - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 472 of 544

Signaling interface

553-3011-100 Standard 14.00
NTAK10 2.0 Mb DTI card
• updating of per channel loopback registers
• controlling the far-end loopback and digroup loopback functions
Interconnections
The external interconnection is through a 50-pin MDF connector with a
NTBK05 carrier cable A0394217.
CEPT interface
For the Conference of European Postal Communications (CEPT) interface,
the connection to the external digital carrier is through NT5K85 DTI cable
assembly A0392021. It converts the 120ohm D-connector to 75ohm coax.
The impedance is switch set. See the switch-settings table at the end of this
chapter for options.
If a coax interface is required, use NT5K85 in conjunction with the NTBK05.
Channel associated signaling
Channel associated signaling implies that each traffic carrying channel has its
own signaling channel permanently associated with it. Timeslot 16 is used to
transmit two types of signaling: supervisory and address.
Incoming signal
Functions of the NTAK10 with regard to incoming signaling include:
• recognizing valid changes.
• determining which channels made the changes.
• collecting PPM.
• reporting changes to software.
Outgoing supervisory signals
The desired abcd bit pattern for a channel is output by the NTAK10, under
the control of the System Core card. The bit pattern to be transmitted is held
on the line for a minimum period of time. This time is specified in the same
message and ensures that the signal is detected correctly at the far end.
January 2002