255-700-585
2-9
PacketStar
®
PSAX 3-Port DS3/E3 ATM Protection Module User Guide
, Issue 1
Release 10.0.0
Chapter 2 Module Description
Software Features
When the user executes the switchover command, the PSAX system
instructs the LIM
nn
module to switch the traffic from the protection mod-
ule running in Active mode to the working module. The working module
is then placed into Active mode and the protection module is placed into
Standby mode.
•
Replacement working module
When the user inserts the new replacement module into the chassis, the
PSAX system recognizes it as an unconfigured module. The user then exe-
cutes the switchover command, and the PSAX system downloads the mod-
ule and connection configurations from the protection module to the new
working module. After this download is finished, the system instructs the
LIM
nn
module to switch the traffic from the protection module running in
Active mode to the working module. The working module is then placed
into Active mode and the protection module is placed into Standby mode.
The connection downtime during this manual switchover in the previous
scenarios is only the amount of time needed to switch the LIM
nn
module.
Software Features
The 3-Port DS3/E3 ATM Protection module implements ATM Forum specifi-
cations UNI 3.0, 3.1,and 4.0, and PNNI 1.0, which allow the DS3 or E3 ports
to function as a user-network interface (UNI), an IISP user or IISP network
interface, or as a PNNI network interface to an ATM network. This module
also supports the virtual interface traffic shaping protocol.
Hardware Features
The 3-Port DS3/E3 ATM Protection module has the following hardware
features:
•
Number of ports: 3
•
Connector type: No external connectors; 6 BNC connectors, 1 receive con-
nector and 1 transmit connector for each port, are located on the LIM3–1
module on the rear of the PSAX 1000 chassis or the LIM3–4 module on the
rear of the PSAX 4500 chassis
•
Line rate:
~
DS3: 44.736 Mbps
~
E3: 34.368 Mbps
•
Line encoding mode:
~
DS3: B3ZS
~
E3: HDB3
•
Line buildout: DS3 only
~
Short [0–40.5 m (0–133 ft)]
~
Long [0–81.1 m (0–266 ft)]
•
Framing modes:
~
DS3: C-bit parity, clear channel, M23