Nortel Networks Option 11C 用户手册
Page 480 of 544
NTAK79 2.0 Mb PRI card
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
which have been attenuated by up 10 dB
•
control of CEPT line density using HDB3 which provides 64 kbps clear
channel
channel
•
performance monitoring of the receive carrier by means of Bipolar
Violations (BPV), Slips, CRC-4 (CRC), and Frame Bit Errors (FBER)
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.
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)
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.
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.
state.