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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 1 Product Overviews
Overview of Card Slot Assignments, by Chassis
8820, because there were several types of these cards (for example AUSM, FRSM, CESM, and so forth).
The serial bus service modules (AXSM and FRSM-12-T3E3) run only in MGX Release 2 and higher
switches, hence the reason to differentiate between the two groups of cards.
Now that AXSM cards support narrow band rates and new CBSM cards are being developed for
high-speed communications, the narrow- or wideband distinction is inappropriate and could be
confusing. For example, one might think that a reference to NBSM cards includes the T1E1 AXSM cards
because these cards support narrow band rates (AXSM cards use the serial bus). Although there are many
differences between the AXSM and the CBSM, the port speed is no longer a clear differentiator.
However, the bus used by AXSM cards and CBSM cards can be used to accurately differentiate between
these two classes of cards.
Therefore, in this guide, CBSM is used to collectively refer to all the cards that use the cell bus for
communications. Some CBSM cards run on the MGX 8850 (PXM1) and MGX 8820 products, and some
are not supported on MGX Release 2 or have become obsolete.
Overview of Card Slot Assignments, by Chassis
As shown in Figure 1-3, the locations where the upper and lower back cards are installed are also called
bays. On a Cisco MGX 8850 switch, a Cisco MGX 8950 switch, or a Cisco MGX 8880 Media Gateway,
each slot has an upper and a lower bay for back cards.
Table 1-3 lists the valid slot numbers of the front cards (or modules) and back cards. Slot information is
listed by chassis.
Note The initial R- on some back cards means that this is a redundant back card, which is used for 1:N card
set redundancy without bulk distribution.
Caution The card and slot arrangements in Table 1-3 are called valid card installation options, because other
arrangements are not valid and can actually damage your chassis. For example, it is very important to
insert the processor cards such as PXM45 or PXM1E into the correct slot for the switch!
Table 1-3 Valid Card Installation Options
Front Card Type Description Back Card Types
Valid Back
Card Bay
Locations
MGX
8830
1
Valid Slot
Numbers
MGX
8850
2
Valid Slot
Numbers
MGX 8880
Valid Slot
Numbers
MGX 8950
Valid Slot
Numbers
AUSM8E1/B 8 port ATM
Universal Service
Modules with E1
interfaces
RJ48-8E1
MGX-RJ48-8E1
3
R-RJ48-8E1
SMB-8E1
R-SMB-8E1
Upper and
lower
3-6,
10-13
4
1-6, 9-14,
17-22,
25-30
5
——
AUSM8T1/B 8 port ATM
Universal Service
Modules with T1
interfaces
RJ48-8T1
R-RJ48-8T1
Upper and
lower
3-6,
10-13
4
1-6, 9-14,
17-22,
25-30
5,6
——