Users Manual

ALL

EFFECTIVITY

Page 5-12

22 Apr 2019

23-15-49

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL

ASPIRE-400

1 This option provides an external AIS client interface when one or more

dynamic PDP contexts are specified and PPPoE is the means of

accessing the SATCOM network. The contexts are initiated by the ACD

in response to user requests collected from the AISD.

2 The following control functions are provided:

a PPPoE with AC Service names - to set up primary contexts

b Out of band control via AT command - to set up secondary or

modify primary contexts

c SNMP - to communicate operational and link status.

3 When notified by the ACD that a requested context is available, the

AISD:

a Supports the ORT defined PDP contexts

b Connects the requesting IP or PPPoE session to the associated

Tunneled PPP Transport over Ethernet (TPToE).

(2) The AISD provides the user interface with the gateway IP address based on the ORT as

follows:

(a) Using the fixed host IP address and subnet mask provided by the ORT;

AND

(b) When AISD is ORT-configured as a DHCP server it also does the following:

1 Assigns user IP address derived from the base address and range

provided by the ORT;

2 Employs a NAT service to forward user traffic over the air.

B. Satellite Handover

(1) The AISD retains active contexts during handover and handles orderly termination of any

pending or established data sessions in the event of a handover failure.

(2) If a new data session is initiated during handover, the AISD accepts the data session, but

postpones the data session initiation until:

(a) Safety Logon is achieved at the 1st satellite link Network Logon attempt, the

AISD initiates the data session.

(b) Safety Logon is failed at the 1st satellite link Network Logon attempt, the AISD

rejects the data session.

C. Auto Background

(1) When configured to Auto Background based on the ACD ORT, the AISD:

(a) Responds to an ACD context query by requesting a background context;

(b) Supports username and password transmission to the ground via the AISD

default service string;

DRAFT

3rd rvw Draft as of:

29 January, 2020