Specifications

ES1008 Operating Manual Page 7
4.2 Manual Switches for Uplink Button, for RJ45 Port #1 Only
The ES1008 switch has a manual uplink sliding switch, located on the front panel next to 10/100Mbps RJ45
port #1 which it controls. It enables the port’s cable to either connect to a user station node (push in) or to be
cascaded (push out) to a 10/100Mbps repeater or switching hub in the network. Verify proper uplink button position
by noting Port 1’s LK (link) LED status, which is illuminated when a proper link is made.
4.3 Manual Switches “F-H”, for Port #9 Only
The ES1008 Switch has a manual sliding switch labeled “F-H” located on the front panel next to port #9. This
manual switch controls the full (F) and half (H) duplex for port #9. When port #9 is on “F”, the port is set to full
duplex at 100Mbps. When port #9 is on “H”, the port is set to half duplex.
4.4 Auto-negotiation, for Fast Ethernet Copper Ports
Waters’ ES1008 copper ports are factory set at 10/100 F/H N-way auto-negotiation per the IEEE802.3u
standard. When the RJ45 ports are set for auto-negotiation and connected to another auto-negotiating device, there
are four modes available depending on the mode the other device supports. These are: (1) 100Mbps full-duplex, (2)
100Mbps half-duplex, (3) 10Mbps full-duplex and (4) 10Mbps half-duplex. The auto-negotiation logic will attempt to
operate in descending order and will normally arrive at the highest order mode that both devices can support at that
time. (Since auto-negotiation is potentially an externally controlled process, the original “highest order mode” result
can change at any time depending on network changes that may occur). If the device at the other end is not an
auto-negotiating device, the ES1008 switch’s RJ45 ports will try to detect its idle signal to determine 10 or 100Mbps
speed and will default to half-duplex at that speed per the IEEE standard.
NOTE: Some NIC cards only auto-negotiate when the computer system that they are in is powered up. These are exceptions to
the “negotiate at LINK – enabled” rule above, but may be occasionally encountered.
When operating in 100Mbps half-duplex mode, cable distances and hop-counts may be limited within that
collision domain. The Path Delay Value (PDV) bit-times must account for all devices and cable lengths within that
domain. The bit time delay is 50BT for Waters’ ES1008 switch ports operating at 100Mbps half-duplex.
4.5 Auto-negotiation for 10Mbps Ports, Half- or Full-Duplex Mode
Full-duplex Ethernet provides separate Transmit and Receive data paths, enabling simultaneous bi-directional
collision-free data movements on a port. The network topology must be a “star” type, not a “bus” type. With full-
duplex mode, the cable distance is only limited by the physical layer line driver and cable attenuation. There are no
collision-domain restrictions or limitations.
Waters’ ES1008 switches perform half- or full-duplex mode auto-negotiation independently on all switched
ports. If the device or node on the other end of a port’s attached cable supports F/H mode auto-negotiation or is set
to operate as full-duplex, the ES1008 switch will negotiate to run full-duplex. If the attached device or node doesn’t
support F/H mode auto-negotiation (for example, if it is a 10Mbps repeater or a standard 10Mbps hub), the switch’s
RJ45 ports will default to operate at half-duplex.
General information
Auto-negotiation per-port for 802.3u-compliant switches occurs when:
 The devices at both ends of the cable are capable of operation at either 10Mbps or 100Mbps
speed and/or in full- or half-duplex mode and can send/receive auto-negotiation pulses, and
 When the second of the two connected devices is powered up*, i.e., when LINK is established for
a port, or
 When LINK is re-established on a port after being lost temporarily.