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Bridges and talkgroups
BRIDGES model
The bridge table maps talkgroup keys (strings, e.g. "26811", "#reflector") to rows. Each row describes:
SYSTEM— which configured system originates or receives this leg.TS— timeslot (1 or 2). OpenBridge sources are normalised to TS1 in routing (bridge_match_slot).TGID— destination ID bytes for LC rewrite toward that leg.ACTIVE— whether this leg participates.TIMEOUT,TO_TYPE,ON/OFF/RESET— activation semantics (user-activated bridges, reflectors, etc.).
The router scans BRIDGES for an ACTIVE row matching the current source system, slot, and destination TG before forwarding (dmrd_received → to_target).
Dynamic vs static
- User-activated bridges are created when a user keys a TG without a pre-built row (subject to
DEFAULT_UA_TIMERand options). - Static TGs and STAT bridges are created from OPTIONS /
make_static_tg/GEN_STAT_BRIDGESflows.
OpenBridge and TG display
For OpenBridge, the DMR destination in the packet may differ from the TGID in a bridge row (remap). Monitoring may show RX TG (as received) vs TX TG (as rewritten for a destination); correlate by stream_id, not TG alone.
Contention
Group voice uses hang time, STREAM_TO, and slot TX_* / RX_* state to avoid colliding transmissions on the same resources.
See also: Special numbers, OpenBridge protocol.