Product Hierarchy
Product Hierarchy

ATMM50 - CAT3 Backbone, 50pr, Armor Shield, PVC Jkt, CMR

CAT3, ATMM/ARMM, 50-Pair, F/UTP-foil shield , Riser-CMR, Premise Backbone Cable, 24 AWG solid bare copper conductors, foam polyolefin insulation with PVC skin, ripcord, corrugated aluminum shield bonded to overall PVC jacket

Product Overview

Suitable Applications: Premise Backbone Cable

Physical Characteristics (Overall)

AWGStrandingMaterialNo. of Pairs
24SolidBC - Bare Copper50
Conductor Count: 100
Total Number of Pairs: 50
PO - Polyolefin (Foam)
Bonded-Pair: N/A
Color Chart
1White & Blue
2White & Orange
3White & Green
4White & Brown
5White & Slate
6Red & Blue
7Red & Orange
8Red & Green
9Red & Brown
10Red & Slate
11Black & Blue
12Black & Orange
13Black & Green
Group One BinderWhite/Blue (12 Pr)
Group Two BinderWhite/Blue (13 Pr)
Group Three BinderWhite/Orange (12 Pr)
Group Four BinderWhite/Orange (13 Pr)
Color Chart 2
1White/Blue (12)
2White/Blue (13)
3White/Orange (12)
4White/Orange (13)
Outer Shield
Outer Jacket
MaterialNominal DiameterRipcord
PVC - Polyvinyl Chloride0.660 inYes

Construction and Dimensions

Type of ArmorMaterialThickness of Armoring Tape
CorrugatedAluminum.008 in

Electrical Characteristics

Conductor DCR
Max. Conductor DCRMax. DCR Unbalance
93.8 Ohm/km5 %
Max. Capacitance UnbalanceNom.Mutual Capacitance
330 pF/100m17 pF/ft
Frequency [MHz]Max. DelayMax. Delay SkewNominal Velocity of Propagation (VP) [%]
16 MHz543 ns/100m45 ns/100m68%
High Frequency
Frequency [MHz]Max. Insertion Loss (Attenuation)Min. NEXT [dB]Min. PSNEXT [dB]Min. ACR [dB]Min. PSACR [dB]Min. RL (Return Loss) [dB]Max./Min. Fitted Impedance
0.772 MHz2.2 dB/100m47.0 dB43.0 dB50.1 dB46.1 dB100 +/- 15
1.0 MHz2.6 dB/100m45.0 dB41.0 dB47.8 dB43.8 dB12.0 dB100 +/- 15
4.0 MHz5.6 dB/100m36.0 dB32.0 dB36.0 dB32.0 dB12.0 dB100 +/- 15
8.0 MHz8.5 dB/100m31.0 dB27.0 dB28.3 dB24.3 dB12.0 dB100 +/- 15
10.0 MHz9.7 dB/100m30.0 dB26.0 dB26.2 dB22.2 dB12.0 dB100 +/- 15
16.0 MHz13.1 dB/100m27.0 dB23.0 dB20.1 dB16.1 dB10.0 dB100 +/- 15
UL Voltage Rating
300 V RMS

Temperature Range

Installation Temperature Range: -20°C To +60°C
UL Temp Rating: 60°C
Storage Temperature Range: -30°C To +60°C
Operating Temperature Range: -30°C To +60°C

Mechanical Characteristics

Bulk Cable Weight: 234 lbs/1000ft
Max. Pull Tension: 300 lbs
Min. Bend Radius During Installation: 13.25 in
Min. Bend Radius/Minor Axis: 6.75 in


NEC/(UL) Compliance: CMR
CEC/C(UL) Compliance: CMR
Data Category: Category 3
ANSI Compliance: S-90-661-2012 Category 3, ANSI/NEMA WC-63.1 Category 3
TIA/EIA Compliance: ANSI/TIA-568-C.2 Category 3

Applicable Environmental and Other Programs

Environmental Space: Riser
EU Directive 2000/53/EC (ELV): Yes
EU Directive 2003/96/EC (BFR): Yes
EU Directive 2011/65/EU (RoHS 2): Yes
EU Directive 2012/19/EU (WEEE): Yes
EU Directive 2015/863/EU (RoHS 2 amendment): Yes
EU Directive Compliance: Yes
EU CE Mark: Yes
EU REACH SVHC Compliance (yyyy-mm-dd): 2017-07-10
MII Order #39 (China RoHS): Yes


Suitability - Aerial: No
Suitability - Burial: No
Suitability - Hazardous Locations: No
Suitability - Indoor: Yes
Suitability - Non-Halogenated: No
Suitability - Oil Resistance: No
Suitability - Outdoor: No
Suitability - Sunlight Resistance: No

Flammability, LS0H, Toxicity Testing

C(UL) Flammability: FT4
UL Flammability: UL 1666 Riser
UL voltage rating: 300 V RMS


Plenum (Y/N): No

Related Part Numbers

Item #ColorPut-Up TypeLengthUPC
ATMM50 008CUTGrayCut to Length612825061991
ATMM50 008CUTGrayCut to Length1 ft612825061991

Product Notes

Notes: Electrical values are expected performance based on cable testing and representative performance within a typical Belden system. Print Includes Descending Footage/Meter Markings. Corrugated Aluminum Armor Bonded to the Jacket.


Update and Revision: Revision Number: 0.380 Revision Date: 04-08-2022
Date: 2005-08-19
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