255-700-447
D-23
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Appendix D PSAX Module Features
E1 Interface Modules
21-Port High-Density E1 IMA Module (23N34)
The 21-Port High-Density E1 IMA module provides a line rate of 2.048 Mbps
per port. The module’s inverse multiplexing for ATM capabilities permit a
user to strap 2 to 21 of the physical ports together to create ATM interfaces
that support up to 43 Mbps of bandwidth. A maximum of 10 IMA groups
may be configured per module.
This module offers native E1 ATM services and E1 IMA services, including
permanent virtual circuits, soft permanent virtual circuits, and switched vir-
tual circuits. The module supports the Traffic Shaping feature on ATM UNI
v3.n, UNI v4.0, IISP, PNNI, and ILMI interfaces. This functionality enables
service providers to offer both individual unchannelized E1 ATM services
(without IMA overhead) and multiple E1 IMA group services using a single
module.
Using the IMA protocol, this module provides an effective method of com-
bining the transport bandwidths of multiple E1 links that are grouped to col-
lectively provide higher intermediate rates. This technique involves inverse
multiplexing and de-multiplexing of ATM cells in a cyclical fashion among
links grouped to form a higher bandwidth logical link whose rate is approxi-
mately the sum of the link rates. This is referred to as an IMA group. From
the system’s viewpoint, these IMA groups are simply new ATM interfaces
sized as multiples of E1. (Refer to Inverse Multiplexing for ATM Version 1.1, af-
phy-0086.001.)
Software Features
The 21-Port High-Density E1 IMA module supports the following protocols
and services:
•
Protocols: ATM, IMA
•
ATM services over IMA groups:
~
ATM UNI 3.0, 3.1, 4.0, and ILMI with traffic shaping
~
IISP user and IISP network with traffic shaping
~
ATM PNNI with traffic shaping
Hardware Features
The 21-Port High-Density E1 IMA module provides the following hardware
features:
•
Number of ports: 21
•
Connector type: 2 Mini-Champ connectors
•
Line rate: 2.048 Mbps
•
Physical interfaces supported: ITU-T G.703, ITU-T G.704
•
Line encoding mode: HDB3 (default), AMI
•
Loopback capabilities: line loopback, local loopback
•
Line buildout: N/A
•
Framing mode: CRC4-CAS
Содержание PacketStar PSAX 2300
Страница 679: ......
Страница 680: ...Part Number 2300M0A9001A1 Copyright 2003 Lucent Technologies All rights reserved ...