OpenScape 4000 STMD3a — ISDN S0 Station/Trunk Module (Variant A)
Variant A of the STMD3 board, combining STMD and SLMS functions on one card. 8 S0 trunk interfaces (each 2B+D); function-equivalent to STMD2 with new hardware. SIPAC backplane connector, on-board flash protection.
Specifications
- Tip / Type
- Station/Trunk Module Digital S0
- Varyant / Variant
- A
- Trunk arabirim sayısı / Trunk interfaces
- 8 × S0 (4-wire)
- S0 access tipi / S0 access type
- Basic Rate (2B + D)
- Ses/veri kanalı başına / Bandwidth per channel
- 64 kbit (B) + 16 kbit (D)
- Yerini aldığı / Replaces
- STMD2 + SLMS2 (fonksiyon eşdeğer)
- Konnektör / Connector
- SIPAC
- LED sayısı / LEDs
- 2 (ön panel)
- Flash koruma / Flash protection
- On-board
- Kısa bus kablo limiti / Short bus cable limit
- ≈ 60 m
- Uzun bus kablo limiti / Extended bus
- Maks. 160 m (AMO SBCSU EXTBUS=YES)
- MDF kablo / MDF cable
- Yeni standart (STMD2'den farklı)
Key features
- 8 S0 trunk interfaces (4-wire) — each provides 2B (64 kbit each, voice/data) + D (16 kbit) basic access.
- Combines STMD (trunk) and SLMS (station) on one board — STMD2 + SLMS2 unified.
- Function-equivalent to STMD2 with a new source number and new components.
- SIPAC connector — refreshed backplane interface.
- Front panel: 2 status LEDs.
- On-board flash protection — see §2.3 lightning protection.
- Short-bus mode (1–8 TE distribution): cable limit ~60 m.
- Extended bus mode via AMO SBCSU EXTBUS=YES → up to 160 m cable.
- MDF cabling differs from STMD2's 24-twisted-wire unprotected approach (new cable standard).
Typical applications
Preserve existing ISDN S0 plant — STMD2 → STMD3a refresh.
European ISDN BRI external trunk — combined trunk + station roles.
Hotel internal ISDN S0 phones — for executive digital terminals.
Long building campus — extended bus (160 m) for runs that need longer cabling.
Lightning-prone regions — on-board flash protection for external trunks.
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DetailsVariant A of the STMD3 board, combining STMD and SLMS functions on one card. 8 S0 trunk interfaces (each 2B+D); function-equivalent to STMD2 with new hardware. SIPAC backplane connector, on-board flash protection.