Ochcc Circuits - Cisco ONS 15454 DWDM Reference Manual

Chapter 11 Optical Channel Circuits and Virtual Patchcords Reference
11.1.3 OCH Trail Circuits
OCH trail circuits transport the OCHCCs. The OCH trail circuit creates an optical connection from the
source trunk port to the destination trunk port of the Transponder (TXP), Muxponder (MXP), GE_XP,
10GE_XP, or ITU-T line card. The OCH trail represents the common connection between the two cards,
over which all the client OCHCC circuits, SVLAN circuits or STS circuits are carried.
Once an OCHCC is created, a corresponding OCH Trail is automatically created. If the OCHCC is
created between two TXP, MXP, GE_XP, or 10GE_XP cards, two circuits are created in the CTC. These
are:
One OCHCC (at client port endpoints)
One OCH trail (at trunk port endpoints)
If the OCHCC is created between two TXPP or two MXPP cards, three circuits are created in the CTC.
These are:
•
•
On a TXP, MXP, and GE_XP card (in layer 1 DWDM mode), additional OCHCC circuits are created
Note
over the same OCH trail.
On a TXP, MXP, GE_XP (in layer 1 DWDM mode), and 10GE_XP (in layer 1 DWDM mode) card, the
Note
OCH trail cannot be created independently, and is created along with the first OCHCC creation on the
card. However, on a GE_XP card (in layer-2 DWDM mode), 10GE_XP card (in layer-2 DWDM mode),
and ADM_10G card, an OCH trail can be created between the trunk ports for the upper layer circuits
(SVLAN in GE_XP/10GE_XP and STS in ADM_10G). No OCHCC is supported in these cases.
If the OCHCC is created between two ITU-T line cards, only one trunk port belongs to the OCHCC at
each end of the circuit.
Table 11-2
Card
TXPs
MXPs
GE_XP
10GE_XP
ADM-10G
ITU-T line cards:
•
•
•
•
•
78-18343-02
One OCHCC (at client port endpoints)
Two OCH Trails (at trunk port endpoints)
One for the working and other for the protect trunk.
Table 11-2
OCHCC and OCH Trail Ports
OC48/STM64 EH
OC192 SR/STM64
MRC-12
MRC-2.5-12
MRC-2.5G-4
lists the ports that can be OCHCC and OCH trail endpoints.
OCHCC OCH Trail
Any client port Any trunk port
Any trunk port Any trunk port
Cisco ONS 15454 DWDM Reference Manual, R8.5
11.1.3 OCH Trail Circuits
11-3