Specifications

Interface Protocols
Operating Characteristics
3-28 68P81095E55-E August 08, 2000
Mobile Switching Center
The MSC is a dynamic and flexible device within the network. It will vary greatly
between provider requirements and market-based installations. A typical MSC will
have several traffic and data pathways:
• SS7 to the global telephone environment, attached hardware and the BSC
• PCM traffic pathways between the MSC and attached hardware and the BSC
• EIA-232, X.25 pathway to the OMC-R
Figure 3-21 MSC Interconnection Paths
Operations and Maintenance Center
The OMC-R is the center of a X.25 network. The interface used will vary with the
aging of the system and the devices being monitored and controlled.
Optional
DTC
LLP
T1
IWF
DS0
DS0
DTC
LLP
E1
DTC
BSC
(MSI)
DS30's
2 DS0's
2 DS0's
22 DS0's
DTC
LLP
T1
2 DS0's
22 DS0's
Switch
Matrix
Core
Processor
VLR
HLR
(May be remote)
DTC
LLP
VMS
SS7
up to
128 DS0's
PSTN
SS7
PCM
PCM
OMC
RS-232
X.25
SS7