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Appendix D PSAX Module Features
DS1/T1 Interface Modules
D-6
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Software Features
The 8-Port HDSL-2 module supports the following services:
•
ATM: ATM UNI 3.0, 3.1, and 4.0; Interim inter-switch signaling protocol
(IISP) user, IISP network; PNNI 1.0, all with traffic shaping
•
CE: Circuit emulation service (CES) with ISDN PRI using 64 Kbps clear
channel; 1x64 Kbps structured CAS; Nx64 Kbps structured CCS; unstruc-
tured CES
Hardware Features
The 8-Port HDSL-2 module provides the following hardware features:
•
Number of ports: 8
•
Connector type: one, 50-pin Mini-Champ connector
•
Line rate: 1.552 Mbps
•
Physical interfaces supported: ANSI-T1.418-2000
•
Loopback capabilities on DS1 port: local loopback, line loopback
12-Port Medium-Density DS1 IMA Module (23N33)
The 12-Port Medium-Density DS1 IMA module provides a line rate of
1.544 Mbps per port. The module’s inverse multiplexing for ATM capability
allows you to strap 2 to 12 of the physical ports together to create ATM inter-
faces that support up to 18 Mbps of bandwidth. A maximum of six IMA
groups may be configured per module.
This module offers native DS1 ATM services and DS1 IMA services, including
permanent virtual circuits, soft permanent virtual circuits, and switched vir-
tual circuits. The module supports UNI v3.a, UNI v4.0, IISP, PNNI, and ILMI.
This functionality enables service providers to offer both individual unchan-
nelized DS1 ATM services (without IMA overhead) and multiple DS1 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 DS1 links that are grouped to
collectively 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
approximately 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 inter-
faces sized as multiples of T1. (Refer to Inverse Multiplexing for ATM Version 1.1,
af-phy-0086.001.)
Software Features
The 12-Port Medium-Density DS1 IMA module supports the following pro-
tocols and services:
•
Protocols: ATM, IMA
•
ATM services over IMA groups:
~
ATM UNI 3.0, 3.1, 4.0, and ILMI
~
IISP user and IISP network
~
ATM PNNI