Network Migration; General - Comtech EF Data Vipersat CDD-562L User Manual

N
ETWORK
Upgrading CDM-570/CDD-56X Series Modems to Firmware Version 1.5.3

General

This document covers the migration of networks with CDM-570 and CDD-56X
series modems to IP Router firmware version 1.5.3 from any earlier versions of
code. It addresses the issues customers will face when migrating their networks
and provides a step-by-step plan to facilitate the process.
Comtech Vipersat Networks strives to make firmware migrations as painless as
possible by maintaining backward compatibility with prior versions of code.
Only under unavoidable circumstances where it is absolutely necessary will
backward compatibility be broken. To provide a considerable increase in perfor-
mance and reliability, the 1.5.3 firmware changes the HDLC over-the-air frame
from 16 to 24 bit Cyclic Redundancy Check (CRC). In this case, backward
compatibility with all previous versions has been broken.
Migration of existing networks to the new version of code must be carefully
planned. As soon as the Hub units are rebooted to the new v1.5.3 code, they will
lose communications with any Remote data units that are running v1.5.2.2 or
earlier code. The Hub operator must take care to insure that all online Remote
data units have the new v1.5.3 code in the slot to which they will reboot.
Note that the main concern is for any Remotes that are offline during the migra-
tion phase, and then come back online sometime afterwards.
Since it is not possible to guarantee that all Remote sites will be online during
the initial upgrade to v1.5.3, a migration completion tool and procedure is
A p p e n d i x N e t w o r k M i g r a t i o n
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