# 13.4.6 CDMA Link level data

To create or modify CDMA Link level data set, select the **CDMA Link level data** command from the **Library pull-down menu** or directly **CTRL+SHIFT+L**. This activates the CDMA Link level data window which displays a list of existing CDMA Link level data:

![image.png](https://wiki.cept.org/uploads/images/gallery/2026-06/scaled-1680-/5ibyyppZqVafbgCg-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-xcxwme" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="250" data-vc="media-single" data-width="637" data-width-type="pixel" id="bkmrk-figure-292%3A-cdma-lin"><div class="css-1kzp9g0"><div data-alt="" data-collection="contentId-493114" data-context-id="493114" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="501" data-id="10ae4510-161c-463d-bab9-ae4848eb7d86" data-node-type="media" data-renderer-start-pos="251" data-type="file" data-width="799"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-292%3A-cdma-lin-1" role="none"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="2.gif" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/09a193a7-701c-4a06-a94d-90082d09fa8d#media-blob-url=true&id=10ae4510-161c-463d-bab9-ae4848eb7d86&collection=contentId-493114&contextId=493114&width=799&height=501&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 292: CDMA Link level data library elements**</div></div></div></div></div></div>Regarding the library sets of CDMA Link level data, the default sets distributed within SEAMCAT library are understood to be sufficient to cover typical CDMA systems expected to be deployed in Europe and their respective frequency bands. Any additional link level data may be defined to cover other types of CDMA systems. However, it is recommended that only users with advanced knowledge of CDMA systems develop the new CDMA Link level data for SEAMCAT simulations as several considerations should be kept in mind before creating new Link level data:

<div class="ak-renderer-extension   " data-layout="default" data-node-type="extension" data-testid="extension--wrapper" data-top-level="true" id="bkmrk-the-seamcat-cdma-lin"><div class="ak-renderer-extension-inner-wrapper ak-renderer-extension-overflow-container css-v54qrt"><div class="_1t4wglyw _1syfglyw _1pnoidpf _1gocidpf"><div class="ak-renderer-wrapper is-max css-pw7jst"><div>  
</div><div class="css-1cmhusk" role="none"><div class="ak-renderer-document">- - The SEAMCAT CDMA Link level data have different formats for uplink and downlink sections of CDMA link. In particular, the Link level data for **uplink** provides **Eb / No requirements**, whereas **downlink** data define the **Ec / Ior requirements**;
    - Check carefully that the newly created CDMA link level data is appropriate for the SEAMCAT's CDMA simulation methodology for the respective section of the link (uplink/downlink).

</div></div></div></div></div></div>From the worskpace, select the relevant library item as shown below:

![image.png](https://wiki.cept.org/uploads/images/gallery/2026-06/scaled-1680-/MwVbTbv0pChXDCIV-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-er4axk" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="933" data-vc="media-single" data-width="665" data-width-type="pixel" id="bkmrk-figure-293%3A-example-"><div class="css-1te9y74"><div data-alt="" data-collection="contentId-493114" data-context-id="493114" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="371" data-id="73956a4c-6bac-4033-a49f-54efe44448bf" data-node-type="media" data-renderer-start-pos="934" data-type="file" data-width="617"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-293%3A-example--1" role="none"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="3.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/2d74126f-a697-4deb-979c-415804508211#media-blob-url=true&id=73956a4c-6bac-4033-a49f-54efe44448bf&collection=contentId-493114&contextId=493114&width=617&height=371&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 293: Example on how to import/export to/from the workspace/library for the CDMA Link Level data library elements**</div></div></div></div></div></div>When adding or editing a data set, a table with data points is displayed and new data points entered will appear on the graph (for Downlink sets). For Downlink sets, every data point must as a minimum contain a geometry value, otherwise it is invalid and it will not be possible to leave the editing dialog.

Basic information about the link-level data set can be viewed and amended in by clicking **Basics** button in the sidebar of the edit window. This will display a new dialog.

***Note:** When **Ok** is clicked in the basics dialog any information changed in this dialog will be saved immediately even if **Cancel** is subsequently pressed in the overlying data point window.*

![image.png](https://wiki.cept.org/uploads/images/gallery/2026-06/scaled-1680-/vwzzWRh1HT5Lu983-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-ss2ic" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="1727" data-vc="media-single" data-width="533" data-width-type="pixel" id="bkmrk-figure-294%3A-example-"><div class="css-1a59ukh"><div data-alt="" data-collection="contentId-493114" data-context-id="493114" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="600" data-id="743ddade-a6f0-483d-8bd2-e792be1989f1" data-node-type="media" data-renderer-start-pos="1728" data-type="file" data-width="800"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-294%3A-example--1" role="none"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="4.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/a4259f39-bfa0-440a-b2da-7db0946a8646#media-blob-url=true&id=743ddade-a6f0-483d-8bd2-e792be1989f1&collection=contentId-493114&contextId=493114&width=800&height=600&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 294: Example on how to edit a CDMA Link Level data element**</div></div></div></div></div></div>