Nortel Networks Circuit Card 311 - Manual (Page 129)

Functional description 129
• 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.
Control functions are provided by a microcontroller, a card LAN interface,
and signaling and control circuits on the OPS analog line card.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.