GE UR T60 - Irig-B

To Next Page

To Previous Page

GE Multilin T60 Transformer Protection System 3-27

3 HARDWARE 3.2 WIRING

c) 10BASE-FL AND 100BASE-FX FIBER OPTIC PORTS

ENSURE THE DUST COVERS ARE INSTALLED WHEN THE FIBER IS NOT IN USE. DIRTY OR

SCRATCHED CONNECTORS CAN LEAD TO HIGH LOSSES ON A FIBER LINK.

The fiber optic communication ports allow for fast and efficient communications between relays at 10 Mbps or 100 Mbps.

Optical fiber may be connected to the relay supporting a wavelength of 820 nm in multi-mode or 1310 nm in multi-mode

and single-mode. The 10 Mbps rate is available for CPU modules 9G and 9H; 100Mbps is available for modules 9J, 9K, 9L,

9M, and 9N. The 9H, 9K, and 9M modules have a second pair of identical optical fiber transmitter and receiver for redun-

dancy.

The optical fiber sizes supported include 50/125 µm, 62.5/125 µm and 100/140 µm for 10 Mbps. In order to engage or dis-

engage the ST type connector, only a quarter turn of the coupling is required.

3.2.10 IRIG-B

IRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices. The

IRIG-B code allows time accuracies of up to 100 ns. Using the IRIG-B input, the T60 operates an internal oscillator with 1

µs resolution and accuracy. The IRIG time code formats are serial, width-modulated codes that can be either DC level

shifted or amplitude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipment

can use a GPS satellite system to obtain the time reference so that devices at different geographic locations can be syn-

chronized.

Figure 3–27: OPTIONS FOR IRIG-B CONNECTION

NOTICE

UR-series device

BNC (in)

Receiver

RG58/59 coaxial cable

GPS satellite system

GPS connection

IRIG-B (–)

859716A1.CDR

IRIG-B

time code generator

(DC-shift or

amplitude modulated

signal can be used)

IRIG-B (+)

BNC (out)

Repeater

To other devices

(DC-shift only)