
Marconi 131-7230/03 04 – STM-1E G.703 (Type 2) tributary interface card for Marconi SDH transmission platforms. Used/refurbished, quote-only.
The Marconi 131-7230/03 04 is an STM-1E G.703 (Type 2) tributary interface card for Marconi SDH transmission equipment. This class of card provides an electrical (G.703-standard) STM-1 tributary interface, allowing a multiplexer or add-drop shelf to add or drop a 155 Mbit/s STM-1 signal over coaxial cable rather than fibre.
Marconi, whose transmission business became part of Ericsson following the 2006 acquisition, supplied this card as one of several tributary and interface variants in the 131-72xx and 131-73xx numbering family, alongside optical STM-1 and higher-order tributary cards.
Tech-Star (UK-based, shipped worldwide) stocks used and refurbished legacy telecom transmission hardware including this and related Marconi SDH cards. For stock and lead time, contact our team quoting the full part number 131-7230/03 04.

| Platform | Marconi SMA/System-X/MSH86 SDH transmission |
|---|---|
| Manufacturer | Marconi |

| Platform | Marconi ESR/ESX routing switches and SDH/PDH transmission systems |
|---|---|
| Manufacturer | Marconi |

| Platform | Marconi ESR/ESX routing switches and SDH/PDH transmission systems |
|---|---|
| Manufacturer | Marconi |

| Platform | Marconi ESR/ESX routing switches and SDH/PDH transmission systems |
|---|---|
| Manufacturer | Marconi |

| Platform | Marconi ESR/ESX routing switches and SDH/PDH transmission systems |
|---|---|
| Manufacturer | Marconi |

| Platform | Marconi ESR/ESX routing switches and SDH/PDH transmission systems |
|---|---|
| Manufacturer | Marconi |
| Key Features | STM-1E G.703 electrical tributary interface; SDH multiplexer/add-drop shelf card; Marconi transmission platform component |
|---|---|
| Applications | SDH network tributary add/drop; legacy Marconi transmission shelf maintenance spare; STM-1 electrical interface provisioning |
| Compatibility | Marconi SDH multiplexer/ADM shelves; STM-1E G.703 coaxial tributary interface; part of the 131-72xx/73xx Marconi tributary card family |
| Specifications | Interface: STM-1E (electrical), G.703 standard; Signal rate: 155 Mbit/s (STM-1); Part type: Tributary unit (Type 2) |
| Platform | Marconi SDH transmission platform |
| Manufacturer | Marconi |
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