255-700-025
3-67
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
Optical-Type I/O Modules
voice device can be connected directly to this module in the Access
Concentrator system to communicate over an ATM network.
The Voice 2-Wire Station module has three types of LED indicators: ACTIVE,
FAIL, and LOS (loss of signal). The LOS LED turns on when the port goes
off-hook. It also turns on and off in synchronization with an incoming
ringing signal to the port.
Software Features
The Voice 2-Wire Station module can be used to establish a permanent
virtual circuit (PVC) on a voice circuit that originates on the same module.
This module also provides private-line automatic ring-down (PLAR) service
for the PVC. PLAR provides a point-to-point private line between two
telephone sets. If either station goes off-hook, the other one automatically
rings The ringing will stop when the called station goes off-hook or the
calling station goes back on-hook. The PLAR service provides 20-Hz ring-
down, loop-start supervision, and no signalling. The module also supports
FXS service.
Hardware Features
•
Number of ports: eight
•
Connector type: RJ-11
•
Ringing frequency: 20 Hz
•
Termination impedance: 600 Ohms
Optical-Type I/O Modules
OC-3c Multi-mode and Single-Mode Modules
The OC-3c Multi-Mode (MM) and Single-Mode (SM) modules provide a
fiber optic interface operating in the concatenated mode of the SONET-
defined line rate of 155 Mbps.
•
The interface on the OC-3c Multi-Mode module is intended for very
short-reach applications, usually connections in a building.
•
The interface on the OC-3c Single-Mode module is intended for long-
reach applications, typically between LANs. This module is frequently
used to connect high-speed LAN products (routers and so on) to the ATM
network.
These modules are available in two variations, which differ according to the
firmware installed on the circuit boards.