
255-700-447
D-35
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Appendix D PSAX Module Features
Fiber-Optic Interface Modules
1-Port OC-3c 1+1 APS Module (20N72 (MM)/20N73 (SM))
The 1-Port OC-3c 1+1 Automatic Protection Switching (APS) modules pro-
vide connection redundancy, enabling reliable data transport. These modules
provide a fiber-optic interface operating in the concatenated mode of the
SONET-defined line rate of 155 Mbps.
The module is supplied with the following transmission types:
•
Single-mode (SM) module (20N73) is intended for long-reach applications,
typically between LANs. This module is frequently used to connect high-
speed LAN devices (such as routers) to an ATM network.
•
Multimode (MM) module (20N72) is intended for short-reach applications,
for example, interoffice or intraoffice sections of a local area network
(LAN).
Software Features
The 1-Port OC-3c 1+1 APS modules use the AQueMan algorithm for traffic
flow control.
Hardware Features
The 1-Port OC-3c 1+1 APS modules have the optical specifications shown in
Table D-7.
Table D-7. 1-Port OC-3c 1+1 APS Module Optical Specifications
Feature
Module
Single-Mode
Multimode
Number of ports
1
1
Type of connector (two for each module,
transmit and receive)
SC
(snap-on
connector)
ST
(straight
tip)
Type of fiber optic cable
single-mode
multimode
Fiber optic cable reach (approximate,
depending on fiber makeup)
15 km
(9.3 miles)
2 km
(6,560 feet or 1.2
miles)
Line rate, per port
155 Mbps (SONET)
155 Mbps (SONET)
Optical wavelength (nominal value)
1,310 nm
1,310 nm
Optical input sensitivity
-31 to -8 dBm
-30 to -14 dBm
Optical output power
-15 to -8 dBm
-20 to -14 dBm
Transmitter minimum optical output
power (average)
-15 dBm
-20 dBm
Transmitter maximum optical output
power (average)
-8 dBm
-14 dBm
Receiver minimum optical input power
(average)
-31 dBm
-30 dBm
Receiver maximum optical input power
(average)
-8 dBm
-14 dBm