1+1 HSB

MWA uses 1+1 HSB to protect against microwave link, MPR-e radio, and Packet Microwave Adapter card failures, as well as frequency channel selective fading. Additionally, hitless (errorless) switching provides zero packet loss if a switchover occurs from a main to a spare MPR-e radio.

The following are required for 1+1 HSB:

• one frequency channel

• two MWA Gigabit Ethernet ports (configured in network mode) on two different Packet Microwave Adapter cards installed in adjacent slots (for example, slot 1/2 or slot 5/6); port 1 on one card protects port 1 on the adjacent card, port 2 protects port 2 on the adjacent card, and so on.

• two MPR-e radios (one main and one spare), each connected to one of the MWA Gigabit Ethernet ports on a Packet Microwave Adapter card

  Note:

  An MPR-e radio that is connected to an odd-numbered port on the Packet Microwave Adapter card must be configured as the main radio.

The following protection schemes make up 1+1 HSB:

• 1+1 Equipment Protection Switching (EPS)

• 1+1 Transmission Protection Switching (TPS)

• 1+1 Radio Protection Switching (RPS)

• 1+1 HSB Transmit Diversity Antenna (TDA)

These protection schemes are enabled using the config>port>mw>protection command, with the exception of Transmit Diversity Antenna, which is enabled via the MCT. They interwork with each other as described in the sections that follow.