Frequently asked questions

Do UTC switches support Port Limiting?

Answer:

Answer:

Yes. We call it Rate Limiting. The following switches have this function:

            GE-DSG-244/GE-DSSG-244 Series

            GE-DS-242-PoE

            GE-DS-82/GE-DS-82-PoE

            GE-DSH-73/GE-DSH-82/GE-DSH-82-PoE

How can you configure ''Rate Limiting'' on a switch?

Answer:

Answer:

The following sequence show the process for rate limiting:

 Rate limiting should not be confused with Port Speed. The latter fixes the port speed to 10/100/1000 Mbps or Automatic. Rate limiting establishes a specific limit.

UTC Switch advantages:

Many switches active this setting via complex command line functions. As show above UTC switches use a simple to understand, simple to use graphical user interface allow for setting and viewing of all port status.

How does the cable distance effect available bandwidth for the MCE- Coax

Answer:

Answer:

 Cable distance will always have an effect on any signal transmission. The longer the cable the greater the available bandwidth loss.  The loss from about 5 meters (16 feet) to 1600 meters (about 1 miles) is about 30%. So starting with 100Mbps, the total available bandwidth is about 70Mbps. Using the 54% figure for usage bandwidth would result in about 35Mbps available for your data transmission.

How many cameras can I connect to one single switch?

Answer:

Answer:

That depends on the bandwidth of the individual signals used as input to the ports. The bandwidth of switches are fixed, generally at 10Mbps, 100Mbps and 1 Gbps.

As a general rule, overheads within a switch will consume about 46% of the total bandwidth leaving 54% for data, (in this case data is would be the same as video). For a 100Mbps switch the resulting bandwidth is 54Mbps. For 1G, the resulting bandwidth would be 540Mpbs.

To know the number of cameras you must first know the individual bandwidth of the individual cameras. So a camera requiring 5 Mbps can have 5 cameras on a single 100Mbps port. However it is strongly recommended that only a single device is connected to one port.

How many IP cameras can the MCE-Coax carry.

Answer:

Answer:

That depends on several factors. The first is determining the amount of actual bandwidth available. In IP transmission part of the total bandwidth is taken up on various overheads. In general a conservative figure is to allow about 54% of the total available bandwidth for data transmission. So a 100Mbps would yield about 54Mbps for data. Next is the primary direction the data is traveling. A camera transmitting to a server would be considered Down Stream transmission.

Once the bandwidth of the camera is determined you simply divide that figure into the result bandwidth. For example: if a camera requires 2Mbps of bandwidth and you have 54Mbps available, 27 cameras can theorically be carried on the MCE-Coax.

What are the advantages of using a Ring Topology?

Answer:

 Answer:

In creating ring networks for security networks we create redundancy. Because the ring is sending data unidirectional the system will become redundant. Whenever there is a break in one of the cables the network will automatically recover itself by using the network in a different direction.

The recovery times using the standard protocol configurations such as Spanning tree protocol and rapid spanning tree protocol is between 3 and 60 seconds. By using the proprietary protocol X-Ring on the GE-DSH hardened switches from UTC we can provide a recovery of the signal of less than 20 milliseconds.

20 ms = 1 frame from a surveillance camera

You can create a ring network of up to 50 nodes in one ring without losing recovery time. If you create bigger rings the recovery time of the signal will slightly increase.

What is a layer 2+ switch and what are the advantages.

Answer:

Answer:

The first thing you should know is that layer classifications are not standardized. For video transmission the most important (+) feature is contained with multicasting, which helps to reduce bandwidth and increase transmission efficiency on the network. Many switch manufacturers are claiming to support multicasting but only support IGMP snooping. This is only half of the requirement. Full multicasting requires both snooping and querying.

What is average latency of UTC switches?

Answer:

Answer :

Average latency is measured by using a packet generator. The average latency within UTC switches is 290.000 ns. (using packet size 1518bytes).

What is Port limiting?

Answer:

Answer:

Port limiting, as the name indicates is the function of limiting the amount of bandwidth traffic that can be used at any given individual port. It is used to control traffic and restrict a user from taking up an excessive amount of system bandwidth. Port Limiting is applied to both input and outputs (called Ingress/Egress).

In practical applications this feature can be used to restrict the amount necessary to match the requirements of a device, for example a device that only requires 5 Mbps. In a client application a secondary security viewer to a video security system that doesn't require the need to see either full resolution images or high refresh rates.

What is switch fabric?

Answer:

Answer: 

The switch fabric can be thought of as the switches' internal bandwidth. It indicates how quickly signals travel within the switch. The same rules that apply to single ports should also apply to the switch fabric. Where this becomes important is when switches are stacked. This is when the output of one switch, which we will call a node, is connected to another switch, which we will call a backbone, which also receives inputs from several other switches.

In this case the total bandwidth of all signals received from the various nodes to the backbone should not exceed 54% of the backbone switches' "switch fabric".

In general a backbone switch will contain 24 ports. UTC's 24 port switches have switch fabrics of 48 and 64 Gbps. UTC's 8 port switches have switch fabrics of 16Gbps.

What PoE standard is supported in UTC's network products range?

Answer:

Answer:

The PoE being used with all the Power over Ethernet application is the 802.3AF standard. This standard supports up to 15.4 watt in terms of power.

(The  802.3AT high powered PoE standards is coming soon)

Which IEEE standards are supported by UTC's network switches?

Answer:

Answer: 

All The protocols indicated below are part of UTC's switches. This way they can be compatible to different switch manufacturers:

IEEE 802.3 10Base-T
IEEE 802.3u 100Base-TX/100Base-FX
IEEE 802.3z Gigabit SX/LX
IEEE 802.3ab Gigabit 1000T
IEEE 802.3x Flow Control and Back pressure
IEEE 802.3ad Port trunk with LACP
IEEE 802.1d Spanning tree protocol
IEEE 802.1w Rapid spanning tree protocol
IEEE 802.1s Multiple spanning tree protocol
IEEE 802.1p Class of service
IEEE 802.1Q VLAN Tagging
IEEE 802.1x Port Authentication Network Control
IEEE 802.1ab LLDP
RFC 768 UDP
RFC 793 TFTP
RFC 791 IP
RFC 792 ICMP
RFC 2068 HTTP
RFC 1112 IGMP version 1
RFC 2236 IGMP version 2
IEEE 802.3af Power over Ethernet

How many channels can I send over one fiber?

Answer:

Answer:

We offer the following combination of different channels:

Video

Video + Data

Video + Audio

Video + Contact Closure

In 1, 2, 4, and 8 video channel configurations.

(coming soon: CWDM system to send up to 128 channels of 10 bit digitally processed analog video channels over one fiber!!)

What do we mean by the term ''Optical loss budget''?

Answer:

Answer: 

"Optical loss budget" defines the differences between Transmitter Power and Receiver Sensitivity. It is one of the most important specifications in determining the distance a signal can travel over fiber. 

Usually calculating optical loss budget is a simple math.

Transmitter power  - Receiver Sensitivity  = Loss Budget

Other factors in the system will deduct from the available loss budget. They are:

1. Multimode or Single mode
2. Type of cable (50um or 62.5um)        
3. Number of Connectors: Deduct 1db per connector.
4. Number of Splices: Deduct .5 db per splice