
Model 5341J
DOCSIS 3.0 8x4
Cable Modem
The Zoom Model 5341J cable modem meets the 
cable industry's DOCSIS 3.0 standard for speeds 
up to 343 Mbps, and also works with 
lower-speed DOCSIS 2.0 and 1.1 services. And 
with IPv4 and IPv6 networking support, this is a 
product designed and built for use today and for 
years to come. The Model 5341J has been 
®
tested and certified by CableLabs 
nearly all U.S. cable services.
This modem can be plugged into any Windows, Mac, or Linux computer with an Ethernet port. The Model 5341J 
can also be plugged into routers and routers with wireless capability for sharing of your high-speed service with 
multiple devices. With its easy installation, high speed, and broad compatibility, the Model 5341J is the perfect 
choice for almost any cable modem user.
 to work with 
Features of the Model 5341J include:
¾ Easy installation
¾ Fast data speed
Up to 343 Mbps downstream and 123 Mbps upstream with bonding of up to eight channels downstream and 
four channels upstream
¾ Fast 10/100/1000 Base-T Ethernet connectivity 
To support the very fast DOCSIS 3.0 data transfers and provide compatibility and easy installation with almost 
any Windows, Mac or Linux computer, as well as both wired and wireless routers
¾ Supports IPv4 and IPv6
Support for the latest Internet addressing keeps your equipment current
¾ Five status-reporting LEDs
Power, Downstream, Upstream, Status, and Link lights allow easy status monitoring.
¾ DOCSIS 3.0 compatible, and compatible with earlier standards
Provides support for the latest data-over-cable standard DOCSIS 3.0, as well as DOCSIS 1.1 and 2.0, to 
ensure operation with the fastest available services and compatibility with all U.S. operators. 
DOCSIS (Data Over Cable Service Interface Specification) is the industry standard for transmission of Internet 
data over cable-based systems in the U.S. and many other countries. Check with your service provider to ensure 
they use the DOCSIS standard.
¾ Extensive SNMP management support
Includes MIB-II, Ethernet-Like MIB, Bridge MIB, Cable Device MIB, Baseline Privacy Interface MIB, 
RF Interface MIB
¾ Flexible cable modem orientation – Horizontal, or vertical using the modem stand included
¾ Experienced, U.S.-based technical support for both consumers and service providers
¾ Certified by CableLabs
¾ Two year warranty and U.S. support from Zoom Telephonics, a leader in communications 
products since 1977
®

Model 5341J
DOCSIS 3.0 8x4
Cable Modem
International 
Headquarters
Zoom Telephonics, Inc 
207 South Street   
Boston, MA, 02111 
USA  
Tel: 617-535-9383 
Fax: 617-423-3923
Email: sales@zoomtel.com
Website: www.zoomtel.com
OTCQB: ZMTP
© 2015 Zoom Telephonics, Inc.  
207 South Street, Boston, MA 02111  
Zoom is a registered trademark of Zoom 
Telephonics, Inc. All other registered 
trademarks and trademarks used herein 
are the property of their respective 
holders.
Cable Modem Back Panel
Specifications
General
Cable modem service interface:  F-type female 75 Ω (standard coaxial connector)
Ethernet LAN interface:   RJ-45 10/100/1000 Mbps Ethernet, with Auto-MDI/MDIX
Status indicators:    Power, Downstream link, Upstream link, Connection Status, Ethernet link
Weight:      8.7 ounces (246 grams)
Size:      6.3 x 4.9 x 1.3 inches (16 x 12.4 x .3 cm)
Power adapter:    Level V energy-saving, switching power supply with 12 Volt DC,    
        1 Amp output. NEMA 5-15 (North American style) plug is standard.   
        Other plugs are available.
Operating temperature:   32° to 104° F (0° to 40° C)
System requirements:    - The cable modem must be connected to a cable modem service   
        - An available Ethernet port on a Windows, Mac, or Linux    
Approvals:      FCC part 15B, Bureau Veritas for IEC 60950-1:2005 (2nd Ed.) safety,   
        CE, CableLabs
Warranty:      Two years
Package contents:    Cable modem, modem stand, power cube, Ethernet cable, 
        Quick Start flyer
Operating Parameters
Downstream:                   
  Data rate*:    Up to 343 Mbps (8 channels), Up to 43 Mbps (single channel)   
  Frequency:     88 to 1002 MHz (edge to edge) 
  Modulation:    64 or 256 QAM  
  Operating level range:  -15 to +15 dBmV 
Upstream:
  Data rate*:     Up to 123 Mbps (4 channels), Up to 31 Mbps (single channel)
  Frequency:     5 to 42 MHz (edge to edge)
  Modulation:    QPSK, 8QAM, 16QAM, 32QAM, 64QAM,128QAM, 256QAM
  Operating level range:  A-TDMA:
        S-CDMA:
Security:      DOCSIS 3.0 Security (BPI+, EAE, SSD) 
Networking:
  Network protocols:   IPv4, IPv6, TCP, UDP, ARP, ICMP, DHCP, FTP, TFTP, SNMP, HTTP
  Application protocol:   SNMP v1/v2/v3
  DHCP client:    Automatically retrieves IP and DNS server address from DHCP server 
        at ISP
  ToD (RF868):    ToD support for local and MSO time synchronization
  TFTP client:    TFTP support for cable modem configuration file download
  Management:    Web-based management interface utility
Core chipset:     Broadcom BCM3382DKFBG
* Data throughput will be reduced by network overhead. Delivered data speeds are also dependent upon the configuration and capacity of 
the data-over-cable service on which the 5341J is used.
 that uses any of the DOCSIS standards – 3.0, 2.0, 1.1
 computer, or an available WAN Ethernet port on a wired  
 or wireless router.
®
 +8 to +54 dBmV (32QAM, 64QAM)
 +8 to +58 dBmV (QPSK)
 +8 to +53 dBmV (all modulations)  
5341J 13215