User's Manual

Mobile WiMAX Outdoor RAS SPI-2210 System Description/Ed.05

3.4 Redundancy Structure

The outdoor SPI-2210 has the redundancy structure for main processors, devices and links

to provide persistent and stable service by enhancing the reliability and availability.

In the figure below, ‘

(Red)’ mark indicates the board in service and ‘ (White)’ mark

indicates the board in standby mode.

3.4.1 MMA-S Redundancy Structure

The MMA-S, which is the main processor of the outdoor SPI-2210, supports the

redundancy structure for the system reliability. The MMA-S functionally consists of the

OAM block and the UCCM for GPS reception and clock distribution and each block has

the redundancy structures as follows:

Redundancy Structure of OAM Block

The OAM block of MMA-S is duplicated in active/standby method. The two dual boards

sends/receives data required for the duplication in Low Voltage Differential Signaling

(LVDS) method.

Figure 3.30 Redundancy Structure of OAM Block (MMA-S)

Redundancy Structure of UCCM

The UCCM of MMA-S is duplicated in active/standby method. The two dual boards

sends/receives data required for the duplication in LVDS method

Figure 3.31 Redundancy Structure of UCCM (MMA-S)

Outdoor SPI-2210

LVDS

MMA-S(A)

UCCM

MMA-S(B)

UCCM

Hardware

Block

Redundancy Path

ctive link

Standby link

MMA-S(B)

OAM

Standby

MMA-S(A)

OAM

ctive

LVDS