Cisco 3825 Software Configuration Guide - Page 323
GSM Only Configuration, B-8
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Appendix B Configuration Examples Overview GSM Only Configuration The standard GSM topology includes one or more shorthaul interface connections from the BTS to a RAN-O device via separate T1/E1 connections. The RAN-O devices are connected back-to-back using an MLPPP backhaul connection (two or more T1/E1 connections). At the BSC side, the RAN-O to BSC connectivity is exactly like the BTS to RAN-O connections. In this scenario, only GSM traffic traverses the topology (see Figure B-8). Figure B-8 GSM Only Configuration GSM Only Configuration 270641 OL-15667-03 S0/0/0 Multilink1 Multilink1 S0/0/0 S0/1/0 10.10.10.1 10.10.10.2 S0/1/0 MWR_A MWR_B BTS BSC MWR_A ! card type E1 0 0 card type E1 0 1 ! ! redundancy mode y-cable standalone ! network-clock-participate wic 0 network-clock-participate wic 1 network-clock-participate aim 1 network-clock-select 1 E1 0/0/1 ! ipran-mib snmp-access inBand ipran-mib location cellSite ! ! controller E1 0/0/0 framing NO-CRC4 clock source internal channel-group 0 timeslots 1-31 ! controller E1 0/0/1 channel-group 0 timeslots 1-31 ! controller E1 0/1/0 framing NO-CRC4 clock source internal channel-group 0 timeslots 1-31 ! ! class-map match-any llq-class match ip dscp ef ! ! policy-map llq-policy Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide B-55