2-2
Cisco Multiservice Packet Network Solution Overview
OL-3025-01
Chapter 2 Solution Components
Media Gateways
Cisco MGX 8230, 8250, and 8850 with VISM
The Cisco MGX 8230, 8250, and 8850, together with the VISM, are the highly scalable carrier class
platforms that deliver the voice services in combination with the Italtel Multiservice Switching System
(iMSS) call agent. All components—control processor, IP modules, switching fabric, network
interfaces, service interfaces, critical backplane signals, power supplies, power modules, and cooling
fans—have 100 percent system redundancy, meeting the demand for high availability.
Platform Components
The MGX 8230 with VISM is suitable for smaller end offices, whereas the MGX 8250 and 8850 with
VISM are recommended for larger applications and to allow for future capacity upgrades. The MGX
8230 has a 1.2 Gbps backplane capacity, eight slots for the VISMs, two slots for the Service Resource
Modules (SRMs), and two slots for redundant Processor Switch Modules (PXM-1 cards). See Figure 2-1
for the layout of the MGX 8230.
Figure 2-1 MGX 8230 Platform—Front View
The MGX 8230 supports both SRM and SRM/E (Enhanced SRM) cards. The Cisco Multiservice Packet
Network Solution recommends use of the SRM/E one-port STM-1/OC-3 back card; this provides built-in
bit error rate tester (BERT) capabilities for the E1 lines, bulk distribution, and loop back and redundancy
capabilities.
The PXM-1 combines ATM switching and ATM trunking on one card, with trunking speeds up to OC-12,
although OC-3 is recommended for the Cisco Multiservice Packet Network Solution.
The MGX 8250 and 8850 have an identical chassis of two shelves of 16 cards, with 24 slots for the
VISMs, four slots for the SRMs or SRM/Es, and two slots for the redundant PXM-1 cards. The
MGX 8250 has a 1.2 Gbps backplane capacity whereas the MGX 8850 has a backplane capacity that can
range from 1.2 Gbps to 45 Gbps. See Figure 2-2 for the layout of the MGX 8250 and 8850 platforms.
The VISM service modules can operate in a 1:N redundancy mode; that is, one module on each shelf is
designated as a backup. For example, for a fully loaded 8250 or 8850 chassis with 1:N redundancy, two
of the 24 VISM cards would be used as backup, and 22 cards would carry traffic. With 1:1 redundancy,
each shelf can support six redundant pairs. Note that the individual redundancy groups must offer backup
on the upper and lower shelves independently, and the SRM cards must be in redundant pairs.
72748
Exhaust Plenum
Fan Tray
7 SRM SRM 14
PXM 1
PXM 1
Inlet Plenum
6 VISM VISM 13
5 VISM VISM 12
4 VISM VISM 11
3 VISM VISM 10
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