Figure 17: Mobile Ran With Microwave Transport Example - Alcatel-Lucent 7750 SR OS Interface Configuration Manual

Ports
Sample APS Application:
RAN Aggregation with Microwave Radio Transport
Figure 17
Sig+Data APS is being used.
E1's
(GSM / TDM / 3G)
E1's
(GSM / TDM / 3G)
As depicted in
The following picture depicts APS-protected links between two routers that use Microwave
transport. The 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
the 77x0).
To facilitate a deployment such as shown in this example, some of following features of the 7750
SR-c12 routers are employed:
Page 90
displays a RAN aggregation network deployment example. In this example Uni-dir 1+1
7750c4
7750c12
7750c4
7750c12

Figure 17: Mobile RAN with Microwave Transport Example

Figure 17, some APS-protected interfaces may require microwave radio transport.
BSC
E1's
MLPPP/STM-1's
POS 1+1
7750c4
7750c12
7750 SR OS Interface Configuration Guide
STM-1
GSM/TDM
STM-1's POS
1+1/STM1
ch (MLPPP)
STM-1
8660
Future 7750
= STM-1 Microwave radio
link deployed as transport
for 1 + 1 protected POS.
BSC
RNC
32