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High and Low frequency s tation

Local siteHigh station

Remote siteLow station

High station means: Tx(f1) >Rx(f1’)

Tx(f1)=11500 MHz Rx(f1)=11500 MHz

Rx(f1’)=11000 MHz Tx(f1’)=11000 MHz

Low station means: Tx(f1’) < Rx(f1)

Full duplex

3


IDU ODU IDUODU) ) )TSL RSL

Radio Link Parameters

4

To Establish a radio link, we need configure fo llowing parameters:1. MRMC – Modem scripts (ACM or fixed capacity, channel & modulation)2. TX / RX frequencies – set on every radio

3. Link ID – must be the same on both ends4. Max. TSL – Max. allowed Transmission Signal [dBm]5. Unmute Transceiver – Transceiver is by default muted (is not transmitting)-------------------------------------------------------------------------------------------------------

To verify a radio link, we need control followi ng parameters:1. RSL – Received Signal Level [dBm] – nominal input level is required2. MSE- Mean Square Error [dB]3. Current ACM profile


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Modulation RFU ‐C with RMC‐A RFU‐C Premium with RMC‐B

QPSK Profile 0 Profile 0

8QAM Profile 1 Profile 1





256QAM (strong FEC) Profile 6 N/A256QAM (weak FEC) Profile 7 Profile 6512QAM N/A Profile 7

1024QAM (Strong FEC) N/A Profile 81024QAM (Light FEC) N/A Profile9

MRMC – Multi Rate Mult i Coding Profiles

5


MRMC Scripts – 1 st steep

6

Changing script automatically resets modem inside IP‐20G


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Radio Parameters settings

7

2nd step

3 th step

4 th step

5th

step


To avoid pointing the antenna to a wrong direction (when both links share the samefrequency), LINK ID can be used to alert when such action is take.

“Link ID Mismatch”

# 101

# 101

# 101

# 102“Link ID

Mismatch”

LINK ID – Antenna Alignment Process

8


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Both IDUs of the same link must use the same Link IDOtherwise, “Link ID Mismatch” alarm will appear in Current Alarms Window

“Link ID Mismatch”

# 101

# 101

# 101

# 102“Link ID

Mismatch”

LINK ID – Antenna Alignment Process

9


Questions?

10


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Radio Link Setup Exercise

11

Thank You

ip-20g radio link parameters

Documents