Cisco ASR 5000 series Product Overview page 663

Serving GPRS Support Node (SGSN) Overview
Up to 128 Peer RNCs per virtual SGSN. Up to 256 peers per physical chassis
SCTP Multi-Homing supported to facilitate network resiliency
M3UA operates in ASP & IPSP client/server and single/double-ended modes
Multiple load shared M3UA ASP instances for high-performance and redundancy
Works over Ethernet and ATM (IPoA) interfaces
Facilitates SGSN Pooling
RAB (Radio Access Bearer) Assignment Request
RAB Release Request
Iu Release Procedure
SGSN-initiated Paging
Common ID
Security Mode Procedures
Initial MN Message
Direct Transfer
Reset Procedure
Error Indication
Gb: This is the SGSN's interface to the base station system (BSS) in a 2G radio access network (RAN). It
connects the SGSN via UDP/IP (via an Ethernet interface) or Frame Relay (via a Channelized SDH or SONET
interface). Gb-IP is the preferred interface as it improves control plane scaling as well as facilitates the
deployment of SGSN Pools.
Some of the procedures supported across this interface are:
BSS GSM at 900/1800/1900 MHz
BSS Edge
Frame Relay congestion handling
Traffic management per Frame Relay VC
NS load sharing
NS control procedures
BVC management procedures
Paging for circuit-switched services
Suspend/Resume
Flow control
Unacknowledged mode
Acknowledged mode
Gn/Gp: The Gn/Gp interfaces, comprised of GTP/UDP/IP-based protocol stacks, connect the SGSNs and
GGSNs to other SGSNs and GGSNs within the same PLMN (the Gn) or to GGSNs in other PLMNs (the Gp).
This implementation supports:
OL-22938-02
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