GJXFH, GJXH, GJYXCH: Nola aukeratu FTTH kable egokia zure proiekturako

Zure hornitzaileak bost kable-kablearen modelo-zenbaki ezberdin aipatu ditu - GJXFH, GJXH, GJYXCH, GJYXFCH, GJFJU. Galdera bati erantzun behar diozu POa mugitu aurretik: proiektu honek benetan behar duena?

Gida hau erabaki hori hartzen duen pertsonarentzat idatzita dago. "Zer den zuntz erorketa kablea" berriztapena saltatzen du (gurean bizi dena Zuntz optikoko kableen gida) eta zuzenean eredu-mailako hautaketara iristen da.

FTTH zabaltze baterako erosten baduzu, Saldu jaitsiera kableak eskualdeko ISPei, edo zehaztu proiektu baten diseinuan, hau hamar minutu inguru amaituko duzu eta eredu defendagarri batekin aterako zara.

GJXFH-ko letrek benetan esan nahi dutena

Txinako kableen ereduen kodeak jarraitzen dute YD/T 1258 telekomunikazio estandarra. Behin eredua ikasita, Etorkizuneko modelo-izen bakoitzak zehaztapen-orri bat bezala irakurtzen du:

Gutuna	Esanahia	Kableari buruz esaten dizuna
G	Komunikazio-erabilera kable optikoa	Telekomunikazio kable optiko bat da, ez kobrea edo potentzia hibridoa
J	Barruko erabilera (aurrizki gisa)	Batez ere barrualdean zabaltzeko diseinatua
Y	Kanpoko erabilera (aurrizki gisa)	Kanpoko inguruneetarako diseinatua
X	Arku motakoa / tximeleta zeharkako sekzioa	Laua, Zortzi itxurako profila
F	Indarkidea (testuinguruaren araberakoa)	Ikus beheko kontu-oharra
C	Autosostengagarria mezulari integratuarekin	Barne altzairuzko edo FRP alanbre bat dauka bere tarteari eusteko
H	Zorroa (atzizki gisa)	Kanpoko jaka geruza markatzen du
J (erdiko kodea, adib. GJFJU)	Aramida / KFRP indar-elementua	Erabat metalezkoa ez den errefortzua
U	Ez-metalikoak	Ebakiduran altzairurik ez

Goitik behera irakurtzen:

• GJXFH = barruko arku motako kablea indar-kide batekin eta LSZH zorroarekin
• GJXH = barruko arku motako kablea metalezko indar-elementu batekin eta LSZH zorroarekin (Ez dago "F" izen zaharretan, konbentzio berriagoetan presente)
• GJYXCH = kanpoko arku motako kable autosostengatzailea altzairuzko mezulari batekin
• GJYXFCH = kanpoko arku motako kable autosostengatzailea, FRPn oinarritutako egitura duena
• GJFJU = guztiz metalikoa ez den barruko kablea, aramidazko indar-kideekin

Kontuz hitz bat eredu-izenetan

Hona hemen beste erosketa gidak ez dizun zerbait esango: GJXFH-n "F" letra ez da koherentziaz interpretatzen Txinako fabrikazio oinarrian. Fabrika batzuek FRP esateko erabiltzen dute (ez-metalikoak) indar kideak. Beste batzuek markatzaile generiko gisa erabiltzen dute "indartzeko" eta oraindik kablea barnean altzairuzko alanbre batekin bidaltzen dute..

Bi bertsioak ikusi ditugu eremuan. Etiketatutako jaitsiera kable batGJXFH kanpoaldean a batekin irits daiteke 0.5 mm-ko altzairu fosfatatua bere indar-kide gisa. Hori ez da akats bat; urtetan egon den izendapen-konbentzioaren noraeza da, batez ere maila ertaineko OEMen artean.

Eroslearen errealitatearen egiaztapena:
Inoiz ez onartu kablearen modelo-zenbaki bat bakarrik. Konfirmatu betiindar-kideen materiala etajaka materiala POan edo datu-orrian idatziz. Bi hornitzaileek "GJXFH" aipatu dezakete eta produktu fisiko desberdinak bidal ditzakete. Fitxa fitxa egia da. Eredu kodea iradokizun bat da.

Altzairua, FRP, edo aramida: Aukeratu indar-kidea eredu-zenbakiaren aurretik

Behin indarkideen hiru familiak ezagututa, modelo-zenbakiak ia berak hautatzen du. Hona hemen hiru materialetan zer aldatzen den:

Jabetza	Altzairuzko alanbrea (fosfatatu / galbanizatua)	FRP (Zuntz indartutako plastikoa)	Aramida / KFRP
Trakzio indarra (tipikoa)	Diametro jakin baterako altuena	Ertain-altua	Alta, altzairutik gertuago pisuaren arabera
Eroankortasuna	Metal eroalea	Dielektriko ez-eroalea	Dielektriko ez-eroalea
Dentsitatea / fibconet	Astunena	Argia	Arinena
Kostuen indizea (erlatiboa)	1.0 (oinarri-lerroa)	~1.15–1.30	~1,6–2,2
Nekea okertuz	Ondo makurtuz gero, plastikoki deformatu daiteke	Erresilientea, malgukiak atzera	Bikaina, zuntz erabilera nagusi
Eguraldi hotzeko portaera	Egonkorra	Hauskorra muturreko zero azpian maila baxua bada	Egonkorra sorta zabalean
Suaren portaera LSZH jakarekin	Erre ondoren metal-hondarrak	Errekuntza garbiagoa	Errekuntza garbiagoa
Erabilera kasu tipikoa	FTTH estandarra etxeak gainditu dira, egoitza bertikala, kostuak bultzatutako proiektuak	Barruko ingurune ez-metalikoak, EMI sentikorrak diren eraikin mistoak	Kanpoko tarte guztiz dielektrikoak, igogailuen ardatzak, ospitaleko MRI gelak, eskaera bereziko hedapenak

Benetan gogoratu behar duzun fisika

Zuntz optiko batek datuak argi gisa transmititzen ditu kristalezko nukleo baten bidez. Prozesu hori dafuntsean, interferentzia elektromagnetikoekiko immunea — Gertuko motorren lineako "zarataz" kezkatzen duen edozein bezerori aipa diezaiokezu, transformadoreak, edo igogailuak. Argiari ez dio axola inguruko EMI.

Baina zuntzaren inguruko kablea beste istorio bat da.

Jaitsiera kableak a erabiltzen badumetalezko indar-kidea, metal hori eroalea da. Inguruko tximista baten azpian, goi-tentsioko indukzio-gertaera bat, edo iragankor indartsu bat AC linea paralelo batean, Zure jaitsiera-kablearen barruko elementu metalikoak korronte induzitua har dezake. Kable horren bi muturrak elektronika aktibotik gertu amaitzen direnean (ONT bat etxean, banaketa panel bat juntura itxitura batean), induzitutako korronteak lurrerako bidea du - zure ekipoen bidez.

Horregatik, tximistarako joera duten eskualdeetako instalatzaileak, goi-tentsioko korridoreetan zehar, edo gertuko azpiestazioek askotan zehazten duteerorketa-kable ez-metalikoak (FRP edo KFRP aldaerak). Errendimendu optikoa ez da aldatzen. Arrisku profilak bai.

Erosleentzako aholku profesionala:
Zure bezeroa Asiako hego-ekialdeko montzoi gerrikoan badago, landa-tentsio handiko transmisio-korridore batean zehar, Ekialde Hurbileko basamortuan hauts-ekaitz estatiko handiarekin, edo ospitale bat zehaztuz / azpiestazioa / MRI proiektua, egin gorako galdera bakar bat: "Erabat metalezkoa ez den kable bat behar al da edo hobesten da?” Galdera horrek bost eredu bitara murrizten ditu.

GJXFH - Indoor Bow-Type Workhorse

GJXFH da egoitza FTTH inplementazio gehienek eraikinaren banaketa-kutxaren eta harpidedunaren ONTaren artean instalatzen dutena.. Barruko baldintzetarako diseinatuta dago: tenperatura egonkorrak diren inguruneak, babestutako bideak, tira-indar moderatuak hasierako instalazioan.

1-zuntzezko GJXFH fitxa teknikoa (benetako ekoizpen zehaztapen batean oinarrituta):

Parametroa	Balioa
Zuntz kopurua	1 (gainera 2 / 4-oinarrizko bertsioak)
Zuntz mota	G.657.A2 bihurgunerik gabeko modu bakarrean
Atenuazioa @1310 nm	≤ 0.4 dB/km
Atenuazioa @1550 nm	≤ 0.3 dB/km
Makro-flexio-galera @ 1625 nm, 7.5 mm × 1 buelta	≤ 1.0 dB
Jakaren neurriak	3.0 × 2.0 mm (LSZH, beltza edo zuria)
Indarkidea	0.5 mm (altzairua edo FRP, berretsi PO-n)
Epe luzerako trakzio-karga	40 N
Epe laburreko trakzio-karga	80 N
Min. bihurgune-erradioa (dinamikoa / estatikoa)	30 mm / 15 mm
Funtzionamendu-tenperatura	-40 to +70 °C
Biltegiratze-tenperatura	-40 to +70 °C

Zergatik G.657.A2 prezioa baino garrantzitsuagoa da

Bi erorketa-kable berdinak izan daitezke paperean, bakarrik desberdintzen dira $0.02 metroko, eta oraindik ere oso bestelako aukera bat egin zure bezeroaren etorkizunerako.

G.657.a1 bihurgune moderatuak maneiatzen ditu, baina ~10 mm-ko erradiotik behera nabarmen degradatzen da.G.657.A2 — Goiko zehaztapenaren barruko zuntzak — gehienez ere mantentzen du 1.0 Makro-makurtze galeraren dB a at ere 7.5 mm-ko bihurgune-erradioa at 1625 nm.

Zergatik egiten du 1625 nm materia? Uhin-luzera leiho horretan sarearen diagnostikoa eta etorkizuna baitaXGS-PON 10G berritzea seinaleak zuzenean. Gaur egun A1 zabaltzen duen ISP batek behartutako berriro kable garesti bati aurre egin diezaioke 10G FTTHra berritzen dutenean, zuntz zaharragoak ezin duelako seinalearen osotasuna eduki bihurgune berdinen azpian. A2 kable bat da, indarrean, kostu baxuko aseguru-poliza bat operadorearen hurrengo sare-berritzearen aurka.

Banatzailearen hizpidea:
Handizkako erosle batek zure GJXFH prezioa atzera botatzen duenean, lehiakide bat $ 0,03/m merkeagoa delako, galdetu zein zuntz-maila erabiltzen duen kable merkeagoak. A1 bada, zintzotasunez esan dezakezu: «Hori $0.03 aurreztea birkablearen kostu osoa bihurtzen da hiru urtean XGS-PONera mugitzen direnean". Operadoreentzat erosten duten erosleei matematika hori axola zaie.

Noiz ez erabili GJXFH

Barruko diseinuak barruko erabilera esan nahi du. Ez zabaldu GJXFH aireko zutoin batean edo autosostengatzaile batean. LSZH jaka ez dago UV etengabeko esposiziorako formulatua, sekzio meheak ez du izotz-kargatik bizirik iraungo, eta ez dago kablearen pisua edozein distantziatan eramateko mezulari-haririk.

Erosle batek "GJXFH outdoor" bertsioak dauden ala ez galdetzen badizu, erantzun zintzoa ezetz da. Behar dutena daGJYXCH edoGJYXFCH — mezulari integratua duten kanpoko kableak. Irakurri.

GJXH - Altzairuz indartutako barruko branka mota

GJXH is often used interchangeably with GJXFH in supplier catalogues, and the confusion is real. In our reading of the market, the practical distinction is this: GJXH consistently ships with a phosphated steel wire strength member and slightly higher tensile ratings than the FRP-marked variant.

Typical 2-fiber GJXH datasheet:

Parametroa	Balioa
Zuntz kopurua	2 (gainera 1 / 4-oinarrizko bertsioak)
Zuntz mota	G.657.A2 (confirm A1 vs A2 on order)
Atenuazioa @1310 nm	≤ 0.4 dB/km
Jakaren neurriak	3.1 × 2.0 mm (LSZH, beltza)
Indarkidea	2 × 0.45 mm phosphated steel wire
Epe luzerako trakzio-karga	100 N
Epe laburreko trakzio-karga	200 N
Min. bihurgune-erradioa (dinamikoa / estatikoa)	60 mm / 30 mm
Funtzionamendu-tenperatura	-20 to +60 °C

The most common mistake with GJXH

We have seen technicians pull GJXH through 20-meter conduit runs, up ceiling voids, or across short aerial spans. In every one of those cases the deployment worked on day one and produced customer complaints six months later — micro-fractures inside the fiber, gradual attenuation creep, and a service call to replace the run.

A 100 N long-term tensile rating means the cable can hold its own weight and moderate pulling forceonce installed and static. It does not mean you can drag it through 15 meters of conduit against friction. If your installer needs meaningful pulling force, spec a cable rated for it — usually GJYXCH at 300 N long-term, even for a short indoor-to-outdoor transition.

Real-world scenario:
A buyer in East Africa reported drop cable failures after three months of service. Root cause: their installer used GJXH indoor cable for a 40-meter run through a rooftop conduit because it was on hand. Within one rainy season the LSZH jacket had absorbed enough moisture at exposed conduit joints to induce microbending. The fix was a rework with GJYXCH — and a written material spec on every future PO.

GJYXCH — Self-Supporting Outdoor Drop for Aerial FTTH

GJYXCH is the outdoor workhorse: designed for aerial deployment between utility poles, engineered to hold its own weight over spans up to ~80 meters, and jacketed to survive UV, temperature swing, and moderate rain load.

Typical 2-fiber GJYXCH datasheet:

Parametroa	Balioa
Zuntz kopurua	2 (custom up to 12-core)
Zuntz mota	G.652.D or G.657.A series
Atenuazioa @1310 nm	≤ 0.36 dB/km
Atenuazioa @1550 nm	≤ 0.22 dB/km
Jakaren neurriak	5.0 × 2.0 mm (LSZH, beltza)
Egitura	Flat cable + integrated steel messenger, “figure-8” cross-section
Steel messenger	1 × 1.0 mm
Steel strength members (in cable side)	2 × 0.4 mm phosphated steel
Epe luzerako trakzio-karga	300 N
Epe laburreko trakzio-karga	600 N
Max aerial span	≤ 80 m
Funtzionamendu-tenperatura	-20 to +60 °C

What “self-supporting” actually means

The word matters. A self-supporting drop cable carries its own dead weight plus wind and (in colder climates) ice load, without requiring a separate lashing wire. The integrated messenger inside GJYXCH is what does that work.

For spans up to ~80 meters this design is efficient and cheap. Beyond 80 meters — think longer road crossings, river crossings, or rural aerial runs between poles further apart — the messenger geometry no longer holds the required sag and tension. That is where ADSS cable takes over.

Two common misuses

Do not direct-bury GJYXCH. The jacket is not designed for soil contact, moisture pressure, or rodent load. For direct burial, spec an armored outdoor cable such as GYTA53.

Do not exceed the max span. We have watched installers hang GJYXCH across 100-meter road crossings “just this once” because ADSS was not on hand. Within one storm season, cable sag exceeded compliance limits and pole loading became a safety risk. Match the design to the span, not the calendar.

When You Need Fully Non-Metallic: Aramida (KFRP) and GJYXFCH

Two scenarios drive customers to fully non-metallic drop cables:

Scenario one — active EMI or lightning risk. Substations, high-voltage transmission corridors, telecom-power co-siting projects, eta (in some regions) coastal areas with high atmospheric static. In these environments the customer specification often mandates dielectric drop cables to eliminate any induced-current path.

Scenario two — regulatory or contract mandate. Hospitals near MRI rooms, some airport / military / secure-facility deployments, and specific European telco frameworks that require dielectric last-mile cabling.

For those cases:

• GJYXFCH — outdoor self-supporting version with FRP-based structure instead of steel messenger
• GJFJU — fully non-metallic indoor bow-type with aramid (KFRP) indar kideak

Both variants are available on order rather than as standard stock. Lead times run 1–3 weeks longer than the steel-wire equivalents, and the price index sits at roughly 1.6–2.2× the corresponding metallic version. The buying decision should therefore be“is this project actually one of those two scenarios,” not“do we want non-metallic just to be safe.” Over-specification is a real cost driver.

The Drop Cable Decision Tree — 4 Questions, 1 Eredua

The decision reduces to four sequential questions. Ask them in this order and the correct model falls out:

1. Is the deployment indoor or outdoor?
   Indoor → GJXFH or GJXH · Outdoor → GJYXCH or GJYXFCH
2. For outdoor: is the cable installed aerially between poles, with no separate messenger wire?
   Yes → self-supporting variant (GJYXCH or GJYXFCH) · No → armored outdoor cable such as GYTA53
3. Is a fully non-metallic cable required (EMI zone, lightning-prone, hospital, contract-mandated dielectric)?
   Yes → FRP or KFRP version (GJXFH-FRP indoor, GJYXFCH outdoor, GJFJU for special deployments) · No → steel-reinforced version is fine
4. Is cost-per-meter more important than a premium feature set?
   Yes → steel wire strength member · No → FRP or KFRP for the longer-service-life scenarios above

Lau galdera. Five models. One picked cable.

Before You Sign the PO: A Drop Cable Buying Checklist

Print this section, share it with your procurement or engineering team, and use it every time you request a quote or receive a shipment.

Specification checklist (put these on the PO in writing)

• Modelo zenbakia eta indar-kideen materiala (never trust the model alone)
• Zuntz kopurua (1 / 2 / 4 / custom)
• Fiber grade — insist on G.657.A2 for any FTTH deployment that may be upgraded to XGS-PON
• Jaka materiala (LSZH for indoor and most modern outdoor; PE only where LSZH is not required)
• Jaka kolorea (black is standard outdoor; white or grey may be requested for indoor visibility)
• Bobina luzera (typical 2–3 km per drum; confirm before large orders)
• Print marking format (sequential meter marks, batch code, and any customer branding)
• Certifications required for the destination country (CPR for EU building applications, ANATEL for Brazil, UL/ETL for North American indoor risers)

Quality verification checklist (do these on receipt)

• Every reel should ship with a factory OTDR trace and attenuation report bearing a batch number
• Visually inspect the sheath for consistency, embedded print, and any color inconsistency
• Random-sample a 1-meter section: strip the sheath, confirm strength member matches PO spec
• Bend-test a sample at the rated static bend radius and re-measure loss on an OTDR (a 0.1 dB or greater jump warrants a batch review)

Red flags that should trigger a rejection or renegotiation

• Model number and physical construction do not match the PO
• LSZH sheath emits an obvious plastic smell when a sample is heat-tested (indicates non-compliant compound)
• No batch-level test data supplied with the shipment
• Metal strength member shows early oxidation before installation
• Print marking is smudged or missing at intervals — will fail acceptance testing on the customer side

Bottom Line — Match the Model to the Deployment

Buying a drop cable well is an act of translation. The customer says “we need FTTH last-mile,” which really means “we need the specific model that fits this deployment’s environment, tension profile, EMI risk, and lifecycle.” The decision tree above turns that translation into four questions.

The single most common mistake we see across the region is not overpaying — it is under-specifying. A GJXH indoor cable pulled through a rooftop conduit costs less on the invoice and costs more in the truck rolls it triggers. Spec the model to what the cable will actually experience over its service life, not to what feels cheapest on the day of the PO.

If you would like a printable side-by-side view covering all five models discussed above — you can download it from our FTTH Drop Cable resource hub. We update the sheet quarterly.

Frequently Asked Questions About FTTH Drop Cable Model Selection

What is the difference between GJXFH and GJXH?

GJXFH and GJXH are both indoor bow-type drop cables. In the strict Chinese YD/T 1258 naming convention, the letter F in GJXFH indicates a non-metallic FRP strength member, while GJXH indicates a metallic (usually phosphated steel) indar kidea. Praktikan, factory naming varies — some suppliers ship a cable labeled GJXFH with a steel wire inside. Always confirm the strength member material on your purchase order, not just the model code.

What does GJXFH stand for?

Each letter encodes a physical attribute under YD/T 1258.G stands for communication-use optical cable, J marks it as an indoor cable, X identifies the bow-type (tximeleta) cross-section, F identifies the strength member category, etaH identifies the outer jacket. Read together, GJXFH means an indoor bow-type single-fiber drop cable with a reinforced strength member and an outer sheath (typically LSZH).

Can I use indoor drop cable such as GJXFH outdoors?

Ez. Indoor drop cables use LSZH jackets that are not UV-stabilised for continuous sunlight exposure, and their cross-section is not designed to survive ice load, wind stress, or outdoor moisture. For aerial FTTH deployments between poles, use GJYXCH (steel messenger) or GJYXFCH (non-metallic messenger). For duct or direct-burial use, specify an armored outdoor cable such as GYTA53.

Is FRP or steel wire better for a drop cable strength member?

Neither is universally better — the correct choice depends on the deployment. Steel wire delivers higher tensile strength per dollar and remains the most cost-efficient option for standard indoor residential FTTH. FRP (non-conductive fiber-reinforced plastic) is the correct pick for environments with active EMI, lightning risk, or proximity to high-voltage lines, where a metallic path to ground inside the cable would create a hazard for the connected ONT or distribution equipment.

Are optical drop cables affected by nearby high-voltage lines or lightning?

The optical fiber inside the cable is fundamentally immune to electromagnetic interference — light does not respond to EMI. Hala ere, if the cable uses ametalezko indar-kidea, that metal can pick up induced current from a nearby lightning strike or strong AC transient, and that current has a path through the cable ends to your terminating equipment. For deployments near substations, transmission corridors, or in lightning-prone regions, specify a fully non-metallic (FRP or KFRP) variant.

What is a self-supporting FTTH drop cable?

A self-supporting drop cable has an integrated messenger element — usually a steel wire in GJYXCH or an FRP rod in GJYXFCH — that carries the cable’s own weight across an aerial span between two support points, typically utility poles. This eliminates the need for a separate lashing wire, simplifying aerial installation. Typical maximum span is ~80 meters; longer runs should use ADSS cable instead.

What is the maximum aerial span for a GJYXCH drop cable?

Gutxi gorabehera 80 meters between support points, under standard conditions. Beyond that distance, cable sag exceeds compliance limits under wind and ice load, and the messenger tension can compromise pole hardware. For spans between 80 eta 200+ metroak, deploy ADSS cable, which is engineered for longer aerial runs.

Can I bury GJYXCH cable directly underground?

Ez. GJYXCH is jacketed for aerial exposure to UV and weather, not for soil contact, ground moisture pressure, or rodent protection. For direct burial, use an armored cable such as GYTA53 with a steel-tape armor and appropriate sheathing.

How long is a standard FTTH drop cable per reel?

Standard reel length is typically 2 to 3 kilometers for indoor GJXFH / GJXH and outdoor GJYXCH. Custom reel lengths and larger drums can be produced on order — confirm both the standard offering and any project-specific length requirement with your supplier before finalizing the PO.

What tensile strength does a drop cable actually need for my project?

It depends on the installation scenario, not on the cable name. Wall-run or short indoor deployments typically require 40–100 N long-term tension (GJXFH or GJXH). Conduit pulling, ceiling voids, and short aerial transitions require higher rated cables — even for short outdoor spans, spec GJYXCH at 300 N long-term. Under-speccing the tensile rating is the single most common cause of latent micro-fracture failures we see in the field.

How do I verify drop cable quality before accepting delivery?

Request a factory OTDR trace and attenuation report for every reel, keyed to the batch number. Visually inspect the sheath for consistent color, embedded print marking, and no material inconsistency. Random-sample a short section from each shipment, strip the sheath, and confirm that the strength member material physically matches your PO specification. Any mismatch between the PO and the actual construction should trigger an immediate quality dialogue with the supplier.

What fiber grade should I specify for future-proof FTTH deployments?

ZehaztuG.657.A2 edo gorago. Older-generation G.657.A1 fiber shows significant macro-bending loss at bend radii below 10 mm, especially at 1625 nm — the wavelength window used for XGS-PON 10G FTTH network expansion. Deploying A1 today may force an operator into a costly network re-cable when they upgrade. A2 fiber holds ≤ 1.0 dB loss at a 7.5 mm-ko bihurgune-erradioa at 1625 nm, effectively covering the operator’s next upgrade cycle at a marginal cost premium.