IEC10000062 V1 EN-US
Figure 80: IED set as a slave
5.5.6.2 Service settings for transceiver 21–219
GUID-F8C098BE-407F-4281-951C-BE4AB476C2AA v1
Only one setting is required for transceiver 21–219. It has to be set to internal or
external clock depending on the configuration of the telecommunication network.
Clock synchronization configuration using the rotary switch can be done on the fly.
When transceiver 21-219 port is synchronized from the SDH master clock
(transceiver acting as slave), transceivers at both ends of the line are configured to
use an external clock. To achieve this, the rotary switch on the transceiver's front
panel is set to point to position 0 (LEDs 1, 2, 4 and 8 are not lit).
When the PDH/SDH is port synchronized from transceiver 21-219 (transceiver
acting as master), the local end transceiver is configured to use the internal clock.
To achieve this, the rotary switch on the transceiver's front panel is set to point to
position 1 (LED 1 is lit and LEDs 2, 4 and 8 are not lit).
5.5.7 Earthing
GUID-3321FABA-BC02-4367-BE8F-92C2D37796E5 v1
The interface protection circuitry in transceiver 21-219 requires that the SDH
multiplexer (SDH MUX) interface is either directly or via low resistance connected
to the same earth as the earthing screw on the transceiver's front panel. There is no
overturned protection in transceiver 21-219. If there is potential difference between
transceiver 21-219 earth and SDH MUX earth, current can flow in the outer shield
of the connecting cable. This may damage the cable and degrade the system
functionality resulting in bit errors.
The outer shields of the coaxial cables must be earthed to the chassis via the BNC
contacts at both ends as shown in Figure
81.
1MRK 505 382-UEN B Section 5
Communication set-up
Communication set-up 670/650 series 2.2 93
Application Guide
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