255-700-447
D-45
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Appendix D PSAX Module Features
Serial Interface Modules
configured for frame relay, circuit emulation, terminal emulation, HDLC
passthrough, and asynchronous transfer mode (ATM) (using limitless ATM
network [LANET] protocol).
Software Features
The 6-Port Multiserial module provides the following software features:
•
ATM: ATM UNI 3.0, 3.1, and 4.0
•
CE: Circuit emulation service (CES)
•
Frame relay UNI and NNI (FRF.1, FRF.2, FRF.5, and FRF.8)
•
HDLC Passthrough
•
Terminal emulation
•
ITU-T I.370 (frame relay policing)
•
Congestion management
•
Traffic policing
The following sections explain the application of the interfaces supported on
the 6-Port Multiserial module: frame relay, circuit emulation, terminal emu-
lation, HDLC pass-through, and ATM.
Frame Relay
The 6-Port Multiserial module has interfaces for frame-relay network-level
interworking (FRF.5) and service-level interworking (FRF.8). A maximum of
350 permanent virtual circuits (PVCs) can be assigned on each frame relay
user-network interface (UNI) port. These features enable the Multiservice
Media Gateway system to act as a gateway between routers, remote dial-
access servers, IBM SNA equipment, and other devices configured for frame-
relay operation.
Frame relay policing, and user-selected point-to-point SVCs are supported on
the 6-Port Multiserial module. Frame relay policing enables the user to man-
age traffic at the user-network interface (UNI) or network-network interface
(NNI) by setting performance parameters such as the Committed Information
Rate (CIR), Excess Burst size (Be), and Committed Burst size (Bc).
Circuit Emulation
Each port on the 6-Port Multiserial module can be configured to perform
adaptation for circuit emulation. The implementation of ATM Adaptation
Layer 1 (AAL-1) allows for the transmission of circuit emulation data as Con-
stant Bit Rate (CBR) traffic across an ATM network. With circuit emulation
support, the 6-Port Multiserial module can adapt and concentrate circuit
emulation traffic onto an ATM network. This feature enables the Multiser-
vice Media Gateway system to interface with non-frame relay routers, video
encoders, encryption devices, and other devices which use a synchronous
interface.
Terminal Emulation
Each port on the 6-Port Multiserial module can be configured to perform an
adaptation for terminal emulation. The implementation of ATM Adaptation
Layer 5 (AAL-5) allows for the transmission of terminal emulation data as
Variable Bit Rate (VBR) traffic across an ATM network. With terminal emula-
tion support, the 6-Port Multiserial module can adapt and concentrate termi-
nal emulation traffic onto an ATM network. This feature enables the Multi-
service Media Gateway system to interface with terminal equipment such as
monitors, craft interfaces, console ports, sensors, and other devices imple-
menting an asynchronous interface.
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