
255-700-239
E-15
PacketStar
®
PSAX 4500 Multiservice Media Gateway User Guide
, Issue 2
Release 8.0.0
Appendix E PSAX Modules
1-Port Unchannelized DS3 Frame Relay Module
1-Port Unchannelized DS3 Frame Relay Module
The 1-Port Unchannelized DS3 Frame Relay module provides an unchannel-
ized, high-speed frame relay network interface at digital signal level 3 (DS3),
with a line rate of 44.736 Mbps. Typically, this module is used to connect the
PSAX system to an ATM edge switch. Three light-emitting diode (LED) status
indicators provide the operational status of the module.
Software Features
•
Multiservices:
~
Frame relay UNI and NNI (FRF.1, FRF.2, FRF.5, and FRF.8)
~
ITU-T I.370 (frame relay policing)
~
Congestion management
~
Traffic policing
~
HDLC pass-through
Frame Relay
The 1-Port Unchannelized DS3 Frame Relay module has interfaces for frame-
relay network-level interworking (FRF.5) and service-level interworking
(FRF.8). These features enable the PSAX 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 1-Port Unchannelized DS3 Frame Relay module. Frame relay policing
enables the user to manage traffic at the user-network interface (UNI) or net-
work-network interface (NNI) by setting performance parameters such as the
committed information rate (CIR), excess burst size (Be), and committed
burst size (Bc).
HDLC Passthrough
Each port on the 1-Port Unchannelized DS3 Frame Relay module can be con-
figured to perform adaptation for high-level data link control (HDLC) pass-
through. Without this feature, AAL1 adaptation would be required for data
from HDLC devices connected to a port on the 1-Port Unchannelized DS3
Frame Relay module. With this feature, AAL5 adaptation can be used to
allow HDLC data to be handled as if it were VBR rather than CBR. Since ATM
cells are only generated when HDLC is present, optimal bandwidth is used.
Hardware Features
The 1-Port Unchannelized DS3 Frame Relay module has the following hard-
ware features:
•
Number of ports: 1
•
Connector type: two BNC connectors, one receive connector and one
transmit connector
•
Line rate: 44.736 Mbps (typical)
•
Line encoding mode: B3ZS
•
Line type: C-bit parity