Nortel Networks 1000 - Manual (Page 117)

Functional description 117
•
standard or complex balance impedance (600 or 900 ohm or 3COM1
or 3COM2) selectable on a per unit basis
•
loopback of PCM signals over DS-30X network loop for diagnostic
purposes
The OPS analog line card contains eight independently configurable units.
Relays are provided in each unit to apply ringing onto the line. Signal
detection circuits monitor on-hook/off-hook signaling. Two codecs are
provided for performing A/D and D/A conversion of analog voiceband
signals to digital PCM signals.
Each codec supports four units and contains switchable pads for control of
transmission loss on a per unit basis. The following features are common
to all units on the card:
• OPS or ONS service configurable on a per unit basis
• terminating impedance (600 or 900 ohm) selectable on a per unit basis
•
standard or complex balance impedance (600 or 900 ohm, 3COM1 or
3COM2) selectable on a per unit basis
•
loopback of PCM signals over DS-30X network loop for diagnostic
purposes
The OPS analog line card contains eight independently configurable units.
Relays are provided in each unit to apply ringing onto the line. Signal
detection circuits monitor on-hook/off-hook signaling. Two codecs are
provided for performing Analog/Digital (A/D) and Digital/Analog (D/A)
conversion of analog voiceband signals to digital PCM signals.
Each Codec supports four units and contains switchable pads for control of
transmission loss on a per unit basis. The following features are common
to all units on the card:
•
OPS or ONS service configurable on a per unit basis
• terminating impedance (600 or 900 ohms) selectable on a per unit
basis
• standard or complex balance impedance (600 or 900 ohms, 3COM1 or
3COM2) selectable on a per unit basis
• loopback of PCM signals over DS-30X network loop for diagnostic
purposes
Card control functions
Control functions are provided by a microcontroller, a card LAN interface,
and signaling and control circuits on the NT1R20 OPS analog line card.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.