Nortel Circuit Card Installation Manual page 727

If a coaxial interface is required, use NT5K85 in conjunction with the
NTBK05.
Table 235
2 MB DTI switch options
Off
Switch (Switch Open)
S1-1 —
S1-2 CC Enabled
S2-1 120 ohms
S2-2 75 ohms
S3-1 non-French Firmware
S3-2 —
Channel associated signaling
Channel associated signaling means 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 controller 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.
NTAK10 2.0 Mb DTI card
Circuit Card Description and Installation
Page 727 of 906
On
(Switch Closed)
—
CC Disabled
75 ohms
120 ohms
French Firmware
—