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Page 480 of 544 NTAK79 2.0 Mb PRI card
553-3011-100 Standard 14.00 January 2002
Functional description
NTAK79 provides the following features and functions:
• recovery of the 2.048 kbps data by the CEPT receiver, at signal levels
which have been attenuated by up 10 dB
• control of CEPT line density using HDB3 which provides 64 kbps clear
channel
• performance monitoring of the receive carrier by means of Bipolar
Violations (BPV), Slips, CRC-4 (CRC), and Frame Bit Errors (FBER)
• monitoring of receive carrier alarms including AIS, LOS, and RAI
• transmission of remote alarm when instructed
• slip-buffering receive messages
• supporting National and International bits in time slot 0
• on-board clock controller
• onboard D-channel interface
• 32 software-selectable Tx & Rx Pad values
• conversion of PCM commanding Laws (A-A, u-u, A-u, u-A)
• Card-LAN for maintenance communications
Physical description
The NTAK79 uses a standard IPE-sized (9.5" by 12.5"), multilayer printed
circuit board. The faceplate is 7/8" wide and contains seven LEDs.
In general, the LEDs operate as shown in Table 148.
Table 148
NTAK79 LEDs (Part 1 of 2)
LED State Definition
OOS On (Red) The NTAK79 2MB PRI circuit card is either disabled
or out-of-service.
Off The NTAK79 2MB PRI is not in a disabled state.
ACT On (Green) The NTAK79 2MB PRI circuit card is in an active
state.