Connect in-line with the Ethernet cable near to where
it enters/leaves the building or close to the equipment being protected.
This should be close to the system's earth star point (to enable a good
connection to earth). Install either within an existing cabinet/cubicle
or in a suitable enclosure. If installing two or more protectors together
these can be simultaneously mounted and earthed via a CME kit.
Note: allowing for one protector at each end, ESP ThinNet can be installed
on segment lengths of up to 148 metres and ESP ThickNet can be used
on segment lengths of up to 400 metres.
Suitable accessories
Simultaneously mount and earth up to two ESP ThinNet
or ThickNet protectors on a CME 4 or up to four on a CME 8 (see page
43). Enclosures for a single ESP Thick or ThinNet (the WBX 3/G) or for
protectors on a CME 4 (the WBX 4) or CME 8 (the WBX 8) can be found
on page 44.
Electrical specification
ESP ThinNet
ESP ThickNet
Nominal voltage
-2.05V peak
-2.05V peak
Maximum working voltage
-4.5V peak
-4.5V peak
Current rating (signal)
300mA
300mA
In-line resistance (± 10%)
0.5 ohm insert in coax inner
0.5 ohm insert in coax inner
Bandwidth (50ohm system)
<0.1dB at 10MHz
(<0.3dB at 50MHz)
<0.1dB at 10MHz
(<0.3dB at 50MHz)
Voltage standing wave ratio
<1.08
<1.08
Transient specification
ESP ThinNet
ESP ThickNet
Let through voltage (all conductors)¹
5kV,10/700µs test to:
BS 6651:1999 Appendix C, Cat C-High
ITU (formerly CCITT) IX K17
-signal to screen
-signal screen to earth
20V
325V²
20V
325V²
Maximum surge current³
10kA
10kA
1 The maximum transient voltage let-through the protector
throughout the test (+/-10%), signal to screen and signal/screen to earth.
Response time <10ns.
2 See 'Ethernet technical note above'.
2 Tested with 8/20µs waveshape to ITU (formely CCITT), BS 6651:1999 Appendix C.
