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ES-CUTP and ES-FUTP Manual 

Page 5 

2.4  

Fiber port, ST or SC Connector for the ES-FUTP-8  

 
 
 
 
 
 
100Mbps Fiber port: 

ST 

SC 

 

The Fast Ethernet fiber switched port on the ES-FUTP-8 is set to operate at fixed 100Mbps for 

guaranteed high performance. The fiber port is factory-built as either a multi-mode ST, SC, or MTRJ 
connector. The 100Mbps fiber port will run at 100Mbps at all times with manually selected full- and half-
duplex capability. The 100Mbps fiber port is a switched port and performs as a domain, providing a high 
bandwidth backbone connection (no media converter is required!). 

The fiber port has an “F - H” user-selectable manual switch. When set in the “F” position, it 

forces full-duplex mode. When set in the “H” position, it forces half-duplex mode, still at 100Mbps speed. 

On the ES family of switches, there are three LED’s for the switched ports.  One (LK/ACT) is 

steady ON to indicate LINK, blinking indicates the port is transmitting and receiving.  The SPEED LED is 
ON for 100Mbps and OFF for 10Mbps (when LINK is made). The F/H indicates full duplex when ON, 
when it is OFF, operation is half duplex.  

A fiber cable must be connected to the 100Mbps port and a proper link (LK lit) must be made 

with the device at the other end of the cable in order for these LEDs to provide valid indications of 
operating conditions. 
 

2.5 

Frame Buffering and Latency 

 

Waters’ ES switches are store-and-forward, with each frame (or packet) loaded into the switch’s 

memory and inspected before forwarding can occur.  This technique ensures that all forwarded frames 
are of a valid length and have the correct CRC, i.e., are good packets.  This eliminates the propagation 
of bad packets, enabling all of the available bandwidth to be used for valid information.  
 

While other switching technologies such as "cut-through" or "express" impose minimal frame 

latency, they will also permit bad frames to propagate out to the Ethernet segments connected.  The 
"cut-through" technique permits collision fragment frames, which are a result of late collisions, to be 
forwarded to add to the network traffic.  Since there is no way to filter frames with a bad CRC (the entire 
frame must be present in order for CRC to be calculated), the result of indiscriminate cut-through 
forwarding is greater traffic congestion, especially at peak activity.  Since collisions and bad packets are 
more likely when traffic is heavy, the result of store-and-forward operation is that more bandwidth is 
available for good packets when the traffic load is greatest.  

To minimize the possibility of dropping frames on congested ports, each ES switch dynamically 

allocates buffer space from a 1MB memory pool, ensuring that heavily used ports receive very large 
buffer space for packet storage.  (Many other switches have their packet buffer storage space divided 
evenly across all ports, resulting in a small, fixed number of packets to be stored per port.  When the 
port buffer fills up, dropped packets result.) This dynamic buffer allocation provides the capability for the 
maximum resources of the switch to be applied to all traffic loads, even when the traffic activity is 
unbalanced across the ports.  Since the traffic on an operating network is constantly varying in packet 
density per port and in aggregate density, Waters’ ES switches are constantly adapting internally to 
provide maximum network performance with the least dropped packets. 

When the switch detects that its free buffer queue space is low, the switch sends industry 

standard (full-duplex only) PAUSE packets out to the devices sending packets to cause “flow control”.  
This tells the sending devices to temporarily stop sending traffic, which allows a traffic catch-up to occur 
without dropping packets.  Then, normal packet buffering and processing resumes.  This flow-control 

Tx         Rx

F

H

=     X

UPLINK

Tx         Rx

F

H

=     X

UPLINK

F

H

 

Summary of Contents for ES-CUTP-8

Page 1: ...TP 8 Enclosed Ethernet Switches for Workgroups or Classrooms CORPORATE HEADQUARTERS MANUFACTURING CUSTOMER SERVICE 5001 American Blvd W Suite 605 945 37 th Avenue NW Bloomington MN 55437 Rochester MN 55901 Phone 800 441 5319 Phone 800 328 2275 www watersnet com ...

Page 2: ...nnecting Fiber Optic ST type Twist lock 8 3 2 3 Connecting Fiber Optic SC Type Snap In 8 3 2 4 Connecting Fiber Optic MTRJ Type 8 3 2 5 Power Budget Calculations for ES FUTP 8 Fiber Media 8 3 2 6 Connections to NICs which support Auto Negotiation RJ45 ports 8 3 3 Powering the ES FUTP and ES CUTP Switch 9 4 0 OPERATION 9 4 1 Dual Speed Functionality and Switching 9 4 2 Auto negotiation and Speed se...

Page 3: ...ode 2 0 km 6 562 ft Operating Environment Ambient Temperature 32ºF to 104ºF 0ºC to 40ºC Storage Temperature 5ºC to 160ºF 20ºC to 70ºC Ambient Relative Humidity 10 to 95 non condensing Power Supply External Input 95 125 vac at 60Hz Output 5VDC 2Amps Polarity center positive shell negative Power Consumption 8 watts typical 10 watts max Network Cable Connectors for eight RJ45 shielded female ports an...

Page 4: ...r ES FUTP 8 MTRJ Same as ES FUTP 8 but with multi mode MTRJ type fiber connector ES CUTP 8 with all copper ports ES CUTP 8 8 port 10 100Mbps switch with eight 10 100 N way auto negotiating switched ports Includes store and forward switching that filters and forwards data moving between the ports The internal switch has 16K nodes address table and 1MB packet buffers External power supply Waters Net...

Page 5: ...t all times LEDs to indicate operating status of all ports are mounted on the top There are power PWR and ERROR self test at power up failed indicators for the unit For each port there are Link and Activity LINK ACT LEDs indicating traffic and speed ON for 100Mbps and full half F H duplex indicators The DC power plug connector or jack is in the left rear of the chassis The external power supply is...

Page 6: ...imal frame latency they will also permit bad frames to propagate out to the Ethernet segments connected The cut through technique permits collision fragment frames which are a result of late collisions to be forwarded to add to the network traffic Since there is no way to filter frames with a bad CRC the entire frame must be present in order for CRC to be calculated the result of indiscriminate cu...

Page 7: ...mixed speed requirements like surfing the Internet or downloading data from servers or other sources Some users operate at 100Mbps and some users and utility devices such as print servers run at 10Mbps High performance users need a high bandwidth backbone for access to a central LAN and central file servers The ES FUTP 8 serves this requirement economically The eight full and half duplex switched ...

Page 8: ...nits 3 1 Location of the Switch The location of the switch is dependent on the physical layout of the network The enclosed compact housing makes it ideal to be conveniently mounted on a wall in an office classroom or lab area It can also be mounted or set on a shelf desk or table Locate an AC receptacle that is within six feet 2 meters of the intended switch location The rugged metal enclosure of ...

Page 9: ...of the fiber connectors Save these dust caps for future use 2 Wipe the ends of the dual connectors clean with a soft cloth or lint free lens tissue dampened in alcohol Make certain the connectors are clean before connecting Note One strand of the duplex fiber optic cable is coded using color bands at regular intervals you must use the color coded strand on the associated ports at each end of the f...

Page 10: ...ion properly with NICs Network Interface Cards which support auto negotiation and the Fast Link Pulse FLP coding for the 100BASE TX signaling system When connecting a NIC to the ES FUTP or ES CUTP it may be necessary to reload the NIC drivers on the user device if the NIC has been communicating with a protocol other than 100BASE TX such as 10BASE T When 100Mbps operation is agreed and in use the S...

Page 11: ...ing so that as nodes are added or removed or moved from one segment to another the switch automatically keeps up with node locations An address aging algorithm causes least used addresses to fall out in favor of new frequently used addresses To reset the address buffer cycle power down and up 4 2 Auto negotiation and Speed sensing All eight RJ45 ports independently support auto negotiation for spe...

Page 12: ...s can be set to FDX manually making typical 100Mbps media converters which can be troublesome with auto negotiating ports defaulting to 100Mbps half duplex usable in either HDX or FDX mode as set by the user For the ES CUTP 8 the switched port 2 at F position supports only 100Mbps fixed full duplex 5 0 TROUBLESHOOTING All Waters Network Systems Ethernet switching products are designed to provide r...

Page 13: ...l returns for repair must be accompanied by a Return Material Authorization RMA number To obtain an RMA number contact Waters Network Systems Customer Service at 800 328 2275 office hours 8AM 5PM Central Standard Time or email to netinfo wtrs com When calling please have the following information readily available Name and phone number of your contact person Name of your company institution Your s...

Page 14: ...aid to Waters This warranty will not be effective if in the opinion of Waters Network Systems the product has been damaged by misuse misapplication or as a result of service or modification other than by Waters Waters Network Systems reserves the right to make a charge for handling and inspecting any product returned for warranty repair which turns out not to be faulty This device complies with Cl...

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