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Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 3 Electrical Cards
3.11.2 Ported Mode
The DS3XM-12 supports three different backplane throughput c onfigurations:
• STS-48 when an XC10G or XC-VXC-10G card is used. This configuration supports t he OC-48 rate
in any slot.
• STS-48 for the Slots 5, 6, 12, and 13 when an XCVT card is used.
• STS-12 for Slot 1 through 4, and 7 through 12 slots when an XCVT card is used. This configuration
is bandwidth-limiting in the portless mode of operation.
The backplane throughput configuration is selected in CTC card view using the Maintenance > Card tab.
3.11.2 Ported Mode
The “ported” mode supports up to 12 framed DS-3 bidirectional mapped signals to each DS3XM-12
card, where the traffic is demultiplexed and mapped into a VT1.5 payload. This payload is then mapped
and multiplexed up to a bidirectional STS-1.
3.11.3 Portless Mode
The “portless” mode allows for IXC hand off connections through a sta ndard SONET fiber optical
interface with DS-3-mapped STS-1s as a payload. This physical connection is a ccomplished with any of
the OC-N cards. The system cross-connect grooms the DS-3 map ped STS1 traffic to the appropriate
DS3XM-12 card, where the traffic is demultiplexed and mapped into a VT1.5 payload. Th is payload is
then mapped and multiplexed up to a higher rate STS-1. See the “11.4 Portless Transmux” section on
page 11-15 for more information.
3.11.4 Shelf Configurations
The DS3XM-12 card supports the XCVT, XC10G, and XC-VXC-10G cards. The DS3XM-12 card is
supported in any of the multiservice slots (Slots 1 through 6 and 12 through 17).
The DS3XM-12 card operates at the VT1.5 level and supports a maximum of 6 or 12 ports of “portless”
(DS-3-mapped STS1s) interface, depending on the shelf configuration (see Table 3-14).
Caution Do not install low-density DS-1 cards in the same side of the shelf as DS3XM-12 cards.
Table 3-14 DS3XM-12 Shelf Configurations
Port Maximums
Slots 1 through 4, and
14 through 17
(XCVT Card)
Slots 5, 6, 12, and 13
(XCVT, XC10G, or
XC-VXC-10G Cards)
XC10G/XC-VXC-10G Shelf
(any multiservice slot)
Portless Ports 6 12 12
Ported Ports 12 12 12