RF Core Facing Loopback
1034
WebEML User Manual
If an external connection is required, an attenuator is required as part of the external
connection, typically 60 dB.
Due to the unlimited number of combinations of system configurations possible, the
basic RF diplexer filter is shown. See Figure 774. The RF diplexer filter can be
mounted with the antenna port facing up or down. The TX port facing up or down.
The main RX port facing up or down. The spare RX port facing up, down, or on the
side. The TX port and RX port are always centered on the RF filter. The spare RX
port is always off-set. The RF filter shown in Figure 774 has the antenna port, TX
port, and main RX port facing up and the spare RX port facing down. For additional
information on RF filter configurations, refer to Diplexer Filter Positions contained in
9500 MPR-A MSS and MPT-HL Shelf Assembly Manufacturing Drawing, found in
9500 MPR-A Engineering Support Documentation.
To verify system functionality, insert a test signal (E1, DS1 or DS3) into one of the
provisioned ports (for example, slot 5, DS1 port 22) and monitor the same port (for
example, slot 5, DS1 port 22) for error-free operation.
The following constraints apply to all loopbacks:
• Link Identifier must be disabled before a loopback is activated
• ECID Tx = ECID Rx for TDM2ETH
The following additional constraints apply to Core Facing @RF - Internal loopbacks
for MPT-HLC/HLS:
• The loopback is guaranteed in RTPC only
• With a diversity combiner active, squelch the diversity receiver
• With XPIC enabled, mute the remote XPIC transmitter in order to avoid
interference on the associated XPIC polarization
• In 1+1HSB configuration, apply an RPS Lockout/forced switch to the same
channel where the loopback will be activated
RF Core Facing loopback is not supported on the 11 GHz Transceivers. The 11 GHz
Transceiver variants do not currently support an overlap of the TX and RX ranges.
This prevents being able to perform an RF Core Facing loopback.
• 3EM23888AB: Tx Frequency (10,700 - 11,200 MHz), Rx Frequency (11,200 -
11,700 MHz)
• 3EM23888AC: Tx Frequency (11,200 - 11,700 MHz), Rx Frequency (10,700 -
11,200 MHz)
Caution: Possibility of Service interruption. RF Core Facing loopback is an out of service
procedure. Schedule a maintenance window per local practices and procedures.
Release 7.0.0 3DB 19286 ACAA Issue 01
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