user manual
Table Of Contents
- Cisco ONS 15454 SDH Reference Manual
- Contents
- About this Guide
- Shelf and FMEC Hardware
- Common Control Cards
- Electrical Cards
- Optical Cards
- Ethernet Cards
- Storage Access Networking Cards
- Card Protection
- Cisco Transport Controller Operation
- Security and Timing
- Circuits and Tunnels
- SDH Topologies and Upgrades
- CTC Network Connectivity
- Alarm Monitoring and Management
- Ethernet Operation
- Hardware Specifications
- A.1 Shelf Specifications
- A.2 SFP Specifications
- A.3 General Card Specifications
- A.4 Common Control Card Specifications
- A.5 Electrical Card and FMEC Specifications
- A.5.1 E1-N-14 Card Specifications
- A.5.2 E1-42 Card Specifications
- A.5.3 E3-12 Card Specifications
- A.5.4 DS3i-N-12 Card Specifications
- A.5.5 STM1E-12 Card Specifications
- A.5.6 BLANK Card
- A.5.7 FMEC-E1 Specifications
- A.5.8 FMEC-DS1/E1 Card Specifications
- A.5.9 FMEC E1-120NP Card Specifications
- A.5.10 FMEC E1-120PROA Card Specifications
- A.5.11 FMEC E1-120PROB Card Specifications
- A.5.12 E1-75/120 Impedance Conversion Panel Specifications
- A.5.13 FMEC-E3/DS3 Card Specifications
- A.5.14 FMEC STM1E 1:1 Card Specifications
- A.5.15 FMEC-BLANK Card Specifications
- A.5.16 MIC-A/P Card Specifications
- A.5.17 MIC-C/T/P Card Specifications
- A.6 Optical Card Specifications
- A.6.1 OC3 IR 4/STM1 SH 1310 Card Specifications
- A.6.2 OC3 IR/STM1 SH 1310-8 Card Specifications
- A.6.3 OC12 IR/STM4 SH 1310 Card Specifications
- A.6.4 OC12 LR/STM4 LH 1310 Card Specifications
- A.6.5 OC12 LR/STM4 LH 1550 Card Specifications
- A.6.6 OC12 IR/STM4 SH 1310-4 Card Specifications
- A.6.7 OC48 IR/STM16 SH AS 1310 Card Specifications
- A.6.8 OC48 LR/STM16 LH AS 1550 Card Specifications
- A.6.9 OC48 ELR/STM16 EH 100 GHz Card Specifications
- A.6.10 OC192 SR/STM64 IO 1310 Card Specifications
- A.6.11 OC192 IR/STM64 SH 1550 Card Specifications
- A.6.12 OC192 LR/STM64 LH 1550 Card Specifications
- A.6.13 OC192 LR/STM64 LH ITU 15xx.xx Card Specifications
- A.7 Ethernet Card Specifications
- A.8 Storage Access Networking Card Specifications
- Administrative and Service States
- Network Element Defaults
- Index

10-10
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 10 Circuits and Tunnels
10.4 DCC Tunnels
The XC-VXL-10G and XC-VXL-2.5G card support both low-order and high-order circuits (E-1, E-3,
DS-3, STM-1, STM-4, STM-16, and STM-64 signal rates). They 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 XC10G, XC-VXL-10G, and XC-VXL-2.5G cards work with the TCC2/TCC2P card to maintain
connections and set up cross-connects within the node. You can create circuits using CTC.
Note Chapter 2, “Common Control Cards,” contains detailed specifications of the XC10G, XC-VXL-10G, and
XC-VXL-2.5G cards.
10.4 DCC Tunnels
SDH provides four DCCs for network element operation, administration, maintenance, and
provisioning: one on the SDH regenerator section layer (SDCC) and three on the SDH multiplex section
layer, also called the line DCC (LDCC). A section DCC (SDCC) and line DCC (LDCC) each provide
192 Kbps of bandwidth per channel. The aggregate bandwidth of the three LDCCs 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.
10.4.1 Traditional DCC Tunnels
In traditional DCC tunnels, the ONS 15454 SDH uses regenerator SDCC for inter-ONS-15454-SDH
data communications. It does not use the multiplex section DCCs; therefore, the multiplex SDCCs 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
regenerator SDCC, Tunnel 1, Tunnel 2, or Tunnel 3. You can link a regenerator SDCC to a multiplex
SDCC (Tunnel 1, Tunnel 2, or Tunnel 3) and a multiplex SDCC to a regenerator SDCC. You can also
link multiplex SDCCs to multiplex SDCCs and link regenerator SDCCs to regenerator SDCCs. 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 10-4
shows the DCC tunnels that you can create.
Figure 10-3 shows a DCC tunnel example. Third-party equipment is connected to STM-1 cards at
Node 1/Slot 3/Port 1 and Node 3/Slot 3/Port 1. Each ONS 15454 SDH node is connected by STM-16
trunk (span) cards. In the example, three tunnel connections are created, one at Node 1 (STM-1 to
STM-16), one at Node 2 (STM-16 to STM-16), and one at Node 3 (STM-16 to STM-1).
Table 10-4 DCC Tunnels
DCC SDH Layer SDH Bytes STM-1 (All Ports) STM-4, STM-16, STM-64
SDCC Regenerator Section D1 to D3 Yes Yes
Tunnel 1 Multiplex Section D4 to D6 No Yes
Tunnel 2 Multiplex Section D7 to D9 No Yes
Tunnel 3 Multiplex Section D10 to D12 No Yes