
Chapter 3 System Features
E3 ATM Module
3-54
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
E-1 lines. At the destination IMA module, the E-1 streams are merged back
together in correct order and passed on to other modules as directed by
virtual circuit connections. IMA dynamically handles conditions when E-1s
within an IMA group become unavailable: the IMA "pipe" shrinks in
bandwidth to the remaining E-1s and continues to pass traffic. When a
problem E-1 comes back online, the IMA "pipe" will enlarge to take full
advantage of the restored bandwidth.
Software Features
The firmware supports the following ATM Forum Implementation
Agreements:
~
Inverse Multiplexing over ATM Version 1.0
, af-phy-0086.000
~
Inverse Multiplexing over ATM Version 1.1
, af-phy-0086.1
Hardware Features
•
Number of ports: six
•
Connector type: RJ-45 (120-Ohm symmetrical pair [4 wire] interface)
•
Line rate: 2.048 Mbps
•
Framing mode: cyclic redundancy mode multifrequency (CRC-mf)
•
Line encoding mode: HDB3
•
Protocols: ATM, IMA (inverse multiplexing over ATM)
E3 ATM Module
The E3 ATM module provides a network interface with a line rate of
34.368 Mbps. Typically, the E3 module is used to connect the Access
Concentrator system to an ATM edge switch. This module has three types of
light-emitting diode (LED) indicators: ACTIVE, FAIL, and LOS (loss of signal).
Software Features
The E3 ATM module uses ATM Forum specifications UNI 3.0 or UNI 3.1,
which allow either E-3 port to act as a user network interface (UNI), an
interim inter-switch protocol (IISP) user or network interface, or as a PNNI
network interface to an ATM network.
The software supports the following ATM Forum Technical Committee
Specifications:
•
User-to-Network Interface Specification Version 3.0
, af-uni-0010.001
•
User-to-Network Interface Specification Version 3.1
, af-uni-0010.002
•
Interim Inter-switch Signaling Protocol, Version 1.0
, af-pnni-0026.000
•
Private Network-Network Interface (PNNI), Version 1.0
, af-pnni-0055.000