Alcatel-Lucent 7750 SR - Figure 18: Mobile RAN with Microwave Transport Example; RAN Aggregation with Microwave Radio Transport

Page 74 7750 SR OS Services Guide
RAN Aggregation with Microwave Radio Transport
Figure 18 displays a RAN aggregation network deployment example.
Figure 18: Mobile RAN with Microwave Transport Example
As depicted in Figure 18, some 1+1 APS-protected SDH interfaces require microwave radio
transport. The following picture depicts an 1+1 protected links between 2 routers that use
Microwave transport. The radio equipment acts as a SONET section/ SDH regenerator section
equipment, yet it implements U-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 line,
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, a L-RDI with a valid data will be received on
the 77x0).
7705/7710
7710/7750
7705/7710
OSSG327
E1’s
(GSM / TDM / 3G)
E1’s
MLPPP/STM-1’s
POS 1+1
STM-1’s POS
1+1/STM1
ch (MLPPP)
= STM-1 Microwave radio
link deployed as transport
for 1 + 1 protected POS.
STM-1
GSM/TDM
STM-1
E1’s
(GSM / TDM / 3G)
BSC BSC
RNC
Future 7750
8660