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11.3 Cross-Connect Card Bandwidth

The XC-VXL-10G, XC-VXL-2.5G, and XC-VXC-10G cards support both low-order and high-order

circuits, although only the XC-VXC-10G card supports VC-11 (low-order) circuits. The XC-VXL-10G

and XC-VXL-2.5G cards manage up to 192 bidirectional STM-1 cross-connects, 192 bidirectional E-3

or DS-3 cross-connects, or 1008 bidirectional E-1 cross-connects. The XC-VXC-10G card manages up

to 576 bidirectional STM-1 cross-connects, 576 bidirectional E-3 or DS-3 cross-connects, or 1344

bidirectional E-1 cross-connects.

The XC-VXL-10G, XC-VXL-2.5G, and XC-VXC-10G cards work with the TCC2/TCC2P card to

maintain connections and set up cross-connects within the node. You can create circuits using CTC.

Chapter 2, "Common Control Cards,"

Note

XC-VXL-2.5G, and XC-VXC-10G cards.

11.4 DCC Tunnels

SDH provides four DCCs for network element operation, administration, maintenance, and

provisioning: one on the SDH regenerator section layer (RS-DCC) and three on the SDH multiplex

section layer, also called multiplex-section DCC (MS-DCC). A regenerator-section DCC (RS-DCC) and

multiplex-section DCC (MS-DCC) each provide 192 Kbps of bandwidth per channel. The aggregate

bandwidth of the three RS-DCCs is 576 Kbps. When multiple DCC channels exist between two

neighboring nodes, the ONS 15454 SDH balances traffic over the existing DCC channels. You can

tunnel third-party SDH equipment across ONS 15454 SDH networks using one of two tunneling

methods, a traditional DCC tunnel or an IP-encapsulated tunnel.

11.4.1 Traditional DCC Tunnels

In traditional DCC tunnels, the ONS 15454 SDH uses RS-DCC for inter-ONS-15454-SDH data

communications. It does not use the multiplex section DCCs; therefore, the MS-DCCs are available to

tunnel DCCs from third-party equipment across ONS 15454 SDH networks. If D4 through D12 are used

as data DCCs, they cannot be used for DCC tunneling.

A traditional DCC tunnel endpoint is defined by slot, port, and DCC, where DCC can be either the

RS-DCC, Tunnel 1, Tunnel 2, or Tunnel 3. You can link an RS-DCC to a MS-DCC (Tunnel 1, Tunnel 2,

or Tunnel 3) and a MS-DCC to an RS-DCC. You can also link MS-DCCs to MS-DCCs and link

RS-DCCs to RS-DCCs. To create a DCC tunnel, you connect the tunnel end points from one

ONS 15454 SDH STM-N port to another. Cisco recommends a maximum of 84 DCC tunnel connections

for an ONS 15454 SDH.

Table 11-5

DCC

RS-DCC

Tunnel 1

Cisco ONS 15454 SDH Reference Manual, R8.5

11-12

contains detailed specifications of the XC-VXL-10G,

Table 11-5

shows the DCC tunnels that you can create.

DCC Tunnels

SDH Layer

SDH Bytes

Regenerator Section D1 to D3

Multiplex Section

D4 to D6

Chapter 11 Circuits and Tunnels

STM-1

4 Ports

8 Ports

Yes

STM-4,

STM-16,

STM-64

Yes

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