User Manual

AS4000 Wireless Local Loop
System Overview
GSI 004
605-0000-430
Issue 1.2 Date 7/4/99
Page 5 of 6
2.1.1 EM Interface Specifications
The interfaces to AS8300 EM (see Figure 23) are:
Human Computer Interface (HCI) Terminals.
These are VT220 terminals or emulators, which communicate with the AS8300 EM over an
ISO 8802-3 Ethernet, using TCP/IP and Telnet protocols.
System Managers Terminal (SMT) and Virtual Console System (VCS).
The SMT is a Hewlett-Packard terminal, which is connected to the AS8300 EM via a bi-
directional asynchronous serial link, using ASCII with embedded escape sequences for
display purposes. The VCS is connected to the same serial link via a T switch.
Shelf Controllers (SC).
These are connected to the AS8300 EM via Pads over an X.25 network. They communicate
with the AS8300 EM via Switched Virtual Circuits (SVC), using a ACC proprietary
protocol.
Network Management Layer.
This is the main directing interface - it communicates with the AS8300 EM over a second,
physically separate ISO 8802-3 Ethernet using OSI Transport Services and CMIP
protocols.
File Server
The HP Computer System is a cabinet style HP9000 Series 800 Model G40 Server,
available in High Availability Configuration or Standard Configuration The former is
achieved by equipping a second “warm standby” processor and console plus duplicated
disks and disk mirroring software.