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Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 5 Ethernet Cards
5.7 5.7.1 STS-24c Restriction
Figure 5-6 G1K-4 Faceplate and Block Diagram
The G1K-4 Gigabit Ethernet card provides high-throughput, low-latency transport of Ethernet
encapsulated traffic (IP and other Layer 2 or Layer 3 protocols) across a SONET network while
providing a greater degree of reliability through SONET self-healing protection services. Carrier-class
Ethernet transport is achieved by hitless (< 50 ms) performance in the event of any failures or protection
switches (such as 1+1 APS, path protection, BLSR, or optical equipment protection) and by full
provisioning and manageability, as in SONET service. Full provisioning support is possible through
CTC or CTM. Each G1K-4 card performs independently of the other cards in the same shelf.
5.7.1 STS-24c Restriction
Due to hardware constraints, the card imposes an additional restriction on the combinations of circuits
that can be dropped onto a G-Series card. These restrictions are transparently enforced by the
ONS 15454, and you do not need to keep track of restricted circuit combinations.
When a single STS-24c terminates on a card, the remaining circuits on that card can be another single
STS-24c or any combination of circuits of STS-12c size or less that add up to no more than 12 STSs (that
is a total of 36 STSs on the card).
Flash DRAM CPU
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GBICs
Decode
PLD
Trans-
ceivers
Ethernet
MACs/switch
Mux/
Demux
FPGA
Inter-
face
FPGA
BTC
POS
function
Buffer
memory
Protect/
Main
Rx/Tx
BPIAs
Power
Clock
generation
To FPGA, BTC,
MACs
FAIL
ACT
G1K
RX
1
TX
RX
2
TX
RX
3
TX
RX
4
TX
ACT/LINK
ACT/LINK
ACT/LINK
ACT/LINK