T:LAN OS – November 2025 Update Released
REFERENCE:
Optima Document Number: 4000-T200068A
DATE:
November 26, 2025
DESCRIPTION:
Optima has just released the November 2025 T:LAN OS Update. This version provides a few minor firmware changes and improvements. For more information, please refer to the associated OS release notes or check out the WHAT’S NEW section below.
T:LAN OS DETAILS
VERSION:
1.06.95A
RELEASE:
C4825
BUILD:
7812
RELEASE DATE:
November 26, 2025
IMAGE NAMES:
| NETPRO | |||
| Revision | File | Size | |
| Rev.3x | npe4x…1695AC4825… .rom | 476,476 | |
| Rev.4x | np44x…1695AC4825… .rom | 547,630 | |
| OCP | |||
| Revision | File | Size | |
| Rev.3x | oce4x…1695AC4825… .rom | 349,874 | |
| Rev.4x | oc44x…1695AC4825… .rom | 361,974 |
COMPATIBILITY:
This release is suitable for the following models/units:
- Optima T:LAN NetPro e42/e44, Rev.3x,
- Optima T:LAN NetPro e42/e44, Rev.4x,
- Optima T:LAN OCP e40, Rev.3x,
- Optima T:LAN OCP e40, Rev.4x,
REQUIREMENTS:
For best results, use in conjunction with Optima Remote Commander Client (RCC) Version 3.12.0 (or newer).
WHAT’S NEW:
| NEW FEATURES | |||
| ID | Scope | Description | |
| CHANGES | |||
| ID | Scope | Description | |
| 6000-S4001142 | T:LAN | Improved TCP Congestion Avoidance, Especially Benefitting Low Capacity Links | |
| FIXES | |||
| ID | Scope | Description | |
Authorized users can now download the latest T:LAN OS firmware files via the Optima Cloud Storage.
OPTIMA RECOMMENDED T:LAN OS UPDATE STEPS TO BE TAKEN BEFORE 2026
Perform T:LAN OS Update To A Level Above BN7655
T:LAN OS Versions prior to BN7655 contain a pre-calculated table to determine the DST Start and DST End dates (North America/Canada DST Rules). To guarantee proper DST adherence, Optima recommends that all customers upgrade the T:LAN firmware running in their production units before the current table based data reaches its end. The table based method expires in 2026. The new algorithm based method to determine the DST start and end dates helps extend the service life of a T:LAN unit until at least 2037.
Perform T:LAN OS Update To BN7798 Or Above
Optima recommends that all T:LAN units that have been in production networks for close to 20 years (or more) be regularly checked for the presence of the ‘RAM:FILE Re-Initialized’ and/or ‘RTC Battery Failed’ entries in the T:LAN EVENT LOG.
T:LANs are equipped with a lithium battery on its main printed circuit board. The battery offers a data retention span of nine years (with the unit powered down) and has a total life expectancy of more than 20 years (powered unit). A reliable retention of the T:LAN configuration settings cannot be assumed once the battery is spent. Depleted batteries must be replaced. Please refer to “T:LAN Battery Replacement Procedure” in the T:LAN USER GUIDE for instructions on how to properly and safely replace the lithium battery.
Customers are also encouraged to update to BN7798 or higher before performing the proactive maintenance step [N]PA $ADBC3243 in order to fully test the RTC battery.
For more details, refer to the release notes titled:
4000-T200067A TLAN NetPro OPERATING SYSTEM SOFTWARE RELEASE NOTES SEP 2025.
4000-T200068A TLAN NetPro OPERATING SYSTEM SOFTWARE RELEASE NOTES NOV 2025.
Ralf Doewich
Optima Tele.com, Inc.