ZyXEL Communications IES-1248 VDSL-SWITCH User Manual page 24

IES-1248 User's Guide
Firmware Naming Conventions
A firmware version includes the model code and release number as shown in the following example.
Firmware Version: V3.50(LS.0)
"LS" is the model code.
"LS" denotes the IES-1248-71 for ADSL over POTS (Annex A).
"TR" denotes the IES-1248-73 for ADSL over ISDN (Annex B).
"0" is this firmware's release number. This varies as new firmware is released. Your firmware's release
number may not match what is displayed in this User's Guide.
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xxiv Preface