Figure 20: Mobile Ran With Microwave Transport Example - Alcatel-Lucent 7750 Configuration Manual

Service router

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Sample APS Application: RAN Aggregation with Microwave Radio Transport

Sig+Data APS is being used.

(GSM / TDM / 3G)

(GSM / TDM / 3G)

As depicted in

radio equipment acts as a SONET section/ SDH regenerator section equipment, yet it implements

Unidirectional APS-like processing to provide equipment protection on the local/remote radio

sites respectively.

The active RX line signal (switched independently from TX) is being transmitted over the radio

link to the far end radio where the signal gets transmitted on both active and inactive circuits.

The radio reacts on APS triggered failures as detected by the segment termination function: LOS,

LOF, manual APS commands, and optionally BER SF/SD. Since the radio does not terminate the

SONET/SDH line layer, any line signaling (including Kbytes signaling for APS, line alarms like

RDI/AIS) are not terminated by the radio and arrive at a far-end router.

Note that the far-end router can either send line alarms based on its active link status or based on

physical circuit status (in which case for example, an L-RDI with a valid data will be received on

To facilitate a deployment such as shown in this example, some of following features of the 7750

SR-c12 routers are employed:

7750 SR Interface Configuration Guide

displays a RAN aggregation network deployment example. In this example Uni-dir 1+1

Figure 20: Mobile RAN with Microwave Transport Example

20, some APS-protected interfaces may require microwave radio transport.

depicts APS-protected links between two routers that use Microwave transport. The

MLPPP/STM-1's

Interface Configuration

= STM-1 Microwave radio

link deployed as transport

for 1 + 1 protected POS.

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