Zabbix-Speedport-Plus-VDSL

Zabbix template for Speedport Plus VDSL modem

Monitor a Speedport Plus VDSL modem by polling its built-in JSON endpoint and extracting key line stats, health, and firmware info. Designed and tested for Zabbix 7.0 (probably works on 6.4+)

What this template does

Uses a single HTTP agent master item to fetch http://modem-ip/data/Status.json.

Parses and processes JSON attributes into dependent items (no extra polling load).

Provides triggers for link down, resync, SNR margins, CRC error rate, sync vs attainable, and firmware change.

Includes tuning macros so you can adjust thresholds without editing items.

Prerequisites

Sercomm SpeedPort Plus VDSL modem from Cosmote or any other ISP.

Your Zabbix Server/Proxy must be able to reach the modem’s web UI.

Template macros

Macro	Default	Purpose
{$MODEM.URL}	http://192.168.0.1/data/Status.json	JSON endpoint
{$SNR.DOWN.MIN}	6	Warn threshold for downstream SNR (dB)
{$SNR.UP.MIN}	6	Warn threshold for upstream SNR (dB)
{$ATTAIN.MARGIN}	1.05	Tolerance for sync > max attainable
{$CRC.RATE.WARN}	360	CRC/h Warning threshold
{$CRC.RATE.CRIT}	1800	CRC/h Critical threshold
{$CRC.RATE.WARN.RECOVER}	240	Warning recovery
{$CRC.RATE.CRIT.RECOVER}	1200	Critical recovery

Items

Master

• modem.status.json -> HTTP agent; raw JSON (text)

Status / Times

• modem.dsl.status -> DSL state (“online”) (text; heartbeat 1h)
• modem.dsl.online.string -> last DSL online time as string (text; heartbeat 1d)
• modem.router.uptime.string -> router uptime as string
• modem.dsl.sync.uptime.seconds -> DSL sync uptime
• modem.dsl.uptime.seconds -> DSL link uptime

Rates (Mbps)

• modem.dsl.down -> downstream sync
• modem.dsl.up -> upstream sync
• modem.dsl.max_down -> attainable downstream
• modem.dsl.max_up -> attainable upstream

Line quality (dB)

• modem.dsl.snr.down -> SNR margin down
• modem.dsl.snr.up -> SNR margin up
• modem.dsl.attn.down -> attenuation down
• modem.dsl.attn.up -> attenuation up

Errors

• modem.dsl.crc -> CRC errors (cumulative counter)
• modem.dsl.crc.per_hour -> CRC rate (errors/h) = change/s × 3600 (dependent)
• modem.dsl.fec -> FEC errors (cumulative counter)

Metadata

• modem.device.name -> firmware string
• modem.firmware.version -> firmware string
• modem.dsl.profile -> transmission mode/profile (e.g., VDSL2-17A Annex B)

Triggers

• DSL is DOWN
• Firmware changed
• Low SNR
• CRC rate warning
• CRC rate Critical
• Sync speed higher than attainable

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