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Field notes from the ATOM ISP team.

Telecom, billing, GPON OLT and ISP operations — written by the engineers who build ATOM ISP every day. Use the language switcher to read in your preferred Indian language.

Designing a healthy GPON OLT topology for Indian ISPs

Splitter ratios, feeder length, and the rules of thumb we use when we provision new ATOM ISP customers.

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Auto-renewal grace windows: the Indian ISP playbook

Why a 3-day grace window converts more renewals than aggressive dunning — and how to set it up in ATOM ISP.

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Rate-limiting MikroTik APIs without breaking your NOC

A practical guide to protecting your router APIs from runaway scripts while keeping your RADIUS traffic healthy.

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Moving from FreeRADIUS to PostgreSQL — what we learned

How ATOM ISP migrated every radacct and radpostauth row to a single PostgreSQL cluster with zero subscriber downtime.

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Field-engineer tracking with low-bandwidth OTA updates

Why we sync employee assignments on change events, not on a timer — the trade-offs and the wins.

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WhatsApp Business templates that ISPs actually get approved

A reference set of templates for renewal reminders, payment receipts and outage alerts.

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