G.703 Synchronous Interface Solution – TELLABS G703-120-Q HMQ509V31 | HMQ-509 Series
Where This Product Is Used
The TELLABS G703-120-Q HMQ509V31 (HMQ-509-V31) Interface Module is deployed in mission-critical synchronous digital hierarchy (SDH) and PDH transmission networks where precise G.703 120 Ω balanced interface compliance is mandatory. Typical installation environments include:
- Telecommunications Central Offices – Interconnecting E1/T1 tributary ports between DACS, cross-connects, and multiplexers operating at 2 Mbit/s.
- Mobile Backhaul Networks – Providing structured 2 Mbit/s G.703 feeds from BSC/RNC equipment to transmission nodes in 2G/3G legacy backhaul infrastructure.
- Railway & Utility SCADA Systems – Serving as the physical-layer interface card in SCADA RTU cabinets where deterministic latency and ITU-T G.703 compliance are contractually required.
- Industrial Automation & Process Control – Bridging legacy synchronous serial data streams into modern IP/MPLS edge routers via structured E1 handoff.
- Data Center Interconnect (Legacy) – Maintaining synchronous timing references in colocation facilities still operating PDH-based timing distribution.
- Defense & Government Networks – Supplying hardened, standards-compliant interface cards for secure voice and data multiplexing systems.
Technical Specifications
| Parameter | Value / Standard |
|---|---|
| Manufacturer | TELLABS |
| Part Number | G703-120-Q / HMQ509V31 / HMQ-509-V31 |
| Module Series | HMQ-509 |
| Interface Standard | ITU-T G.703 (120 Ω balanced, 2048 kbit/s) |
| Connector Type | RJ-45 / Balanced twisted-pair (per G.703 Table 6) |
| Line Rate | 2.048 Mbit/s (E1) |
| Impedance | 120 Ω balanced |
| Form Factor | Plug-in module / blade card |
| Weight | 720 g |
| SKU | G703-120-Q HMQ509V31 HMQ-509-V31 |
| Condition | New / Refurbished OEM — specify at inquiry |
Note: Full electrical specifications are available in the TELLABS HMQ-509 hardware manual. Contact us for the datasheet.
Why Engineers Specify This Model
- ITU-T G.703 120 Ω Compliance – Meets the balanced interface mask for 2048 kbit/s, eliminating impedance mismatch issues common with 75 Ω coaxial alternatives in structured-cabling environments.
- TELLABS Platform Compatibility – Designed as a native blade for TELLABS transmission chassis; no adaptation hardware or firmware workarounds required.
- Deterministic Timing Performance – Supports synchronous clocking essential for TDM voice, SS7 signaling, and legacy SCADA polling cycles.
- Proven Field Reliability – The HMQ-509 series has an established track record in carrier-grade deployments across Europe, Asia-Pacific, and the Americas.
- Drop-in Replacement – HMQ509V31 is a direct hardware revision of the HMQ-509 family, maintaining backward compatibility with existing chassis slots and software versions.
- Long-Tail Availability – Konmask.com maintains stock of end-of-life TELLABS modules, enabling network operators to extend equipment life without full platform migration.
Complete System Bill of Materials
For a fully operational G.703 120 Ω interface segment, engineers typically source the following alongside this module:
- TELLABS transmission chassis (compatible HMQ-series shelf)
- 120 Ω balanced E1 patch cables (RJ-45 to RJ-45 or RJ-45 to BNC balun)
- E1 distribution frame (MDF/IDF) with 120 Ω termination blocks
- Timing source / BITS clock (e.g., GPS-disciplined oscillator)
- Network management card (TELLABS NMS-compatible)
- Redundant power supply module for chassis
Contact support@konmask.com for bundle pricing on multi-line BOM sourcing.
Compliance & Industry Standards
- ITU-T G.703 – Physical/electrical characteristics of hierarchical digital interfaces
- ITU-T G.704 – Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels
- ITU-T G.823 – Control of jitter and wander within digital networks based on the 2048 kbit/s hierarchy
- ETSI EN 300 166 – Transmission and Multiplexing; physical and electrical characteristics of 2048 kbit/s digital interfaces
- RoHS – Compliance status available on request for applicable hardware revisions
Quality Assurance & Sourcing
Konmask.com operates as a specialist distributor of industrial automation and telecommunications hardware. Our sourcing and QA process for the TELLABS G703-120-Q HMQ509V31 includes:
- Multi-source verification – Units are cross-referenced against TELLABS OEM part databases before listing.
- Visual & functional inspection – Each module is inspected for physical integrity, connector condition, and firmware label accuracy prior to dispatch.
- Traceability documentation – Serial number records and sourcing chain documentation available for enterprise and government procurement.
- Secure anti-static packaging – All modules ship in ESD-safe bags with foam-lined cartons rated for international freight.
- Warranty – 90-day replacement warranty on verified functional units; extended warranty available by arrangement.
How to Source This Part
- Add to Cart – For standard single-unit or small-quantity orders, proceed directly via the product page.
- Request a Quote (RFQ) – For orders of 5+ units, OEM lot purchases, or BOM-level sourcing, email support@konmask.com with your required quantity, delivery timeline, and destination country.
- Confirm Compatibility – Provide your TELLABS chassis model and current firmware version so our engineers can confirm slot and software compatibility before shipment.
- Export & Customs – We handle CN export documentation; buyers are responsible for import duties per destination country regulations. HS Code guidance available on request.
- Lead Time – In-stock units typically ship within 2 business days from Xiamen, China. ETA for international delivery: 5–15 business days depending on carrier and customs clearance.
Application-Specific FAQ
Q: Is the HMQ509V31 compatible with all TELLABS HMQ-509 chassis variants?
A: The V31 hardware revision is backward-compatible with standard HMQ-509 shelf slots. Confirm your chassis firmware version with us before ordering if you are running a non-standard software build.
Q: What is the difference between G.703 75 Ω and 120 Ω versions?
A: The 75 Ω variant uses unbalanced coaxial connectors (BNC/SMB) and is common in older European PDH installations. The 120 Ω balanced version (this module) uses twisted-pair cabling and is preferred in structured-cabling environments and modern E1 deployments. They are not interchangeable without a balun.
Q: Can this module be used in a non-TELLABS chassis?
A: No. The HMQ-509 is a proprietary TELLABS blade module and requires a compatible TELLABS shelf for power, backplane signaling, and NMS integration.
Q: Do you supply the TELLABS NMS software license alongside the hardware?
A: Software licenses are subject to TELLABS end-user license agreements. Contact us to discuss available options for legacy NMS support.
Q: What documentation is available?
A: We can provide the TELLABS HMQ-509 hardware installation guide, compliance declarations, and sourcing chain documentation upon request for qualified buyers.
Q: Is this product available for export to my country?
A: We ship globally. Certain destinations may be subject to export control regulations. Contact us with your country and end-use details for compliance confirmation.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
