Common Control Cards; Mechanical Interface Cards; Optical Cards; Ethernet Card - Cisco ONS 15327 User Documentation

Card Protection

13.1.1 Common Control Cards

The two common control cards are the XTC-28-3 card and the XTC-14 card. Both cards provide timing,
control, and digital cross-connect functions. They also provide the EIA/TIA-232 DB9 TL1 connection
and RJ-45 LAN connection. The XTC-28-3 provides electrical-tributary circuitry for 28 DS-1s and three
DS-3s. The XTC-14 provides electrical-tributary circuitry for 14 DS-1s.

13.1.2 Mechanical Interface Cards

The MICs provide the physical connection points for the DS-1 and DS-3 interfaces on the XTC cards,
the redundant power inputs, the alarm inputs and outputs, and the building integrated timing supply
(BITS) inputs and outputs.

13.1.3 Optical Cards

The optical cards include the OC3 IR 4 1310, OC12 IR 1310, OC12 LR 1550, OC48 IR 1310, and the
OC48 LR 1550. The OC3 IR 1310 card provides four intermediate-reach OC-3 interfaces. The OC12 IR
1310 card provides one intermediate- or short-reach OC-12 interface and the OC12 LR 1550 provides
one long-reach OC-12 interface. The OC48 IR 1310 card provides one intermediate-reach OC-48
interface and the OC48 LR 1550 provides one long-reach OC-48 interface.

13.1.4 Ethernet Card

The Ethernet card provides four layer-2-switched, autosensing, 10/100 BASE-T Ethernet interfaces.
Each interface supports full-duplex operation for a maximum bandwidth of 200 Mbps per port.
13.2 Card Protection
The ONS 15327 provides both optical and electrical protection methods. The XTC-14 card provides
electrical-protection circuitry for DS-1s. The XTC-28-3 provides electrical-protection circuitry for
DS-1s and DS-3s. The optical cards use 1+1 protection, in which one optical port protects another optical
port of the same type. This section describes the protection options.

13.2.1 Unprotected

Unprotected cards are not included in a protection scheme; therefore, a card failure or a signal error
causes lost data. Because no bandwidth is reserved for protection, unprotected schemes maximize the
available ONS 15327 bandwidth. On the ONS 15327, only OC-N cards can run unprotected. DS-N cards
are protected by default because of the automatically created protection group, XTCProtGroup.

13.2.2 Electrical Protection

The XTC cards provide protection for the DS-1 and DS-3 circuits and for each other when installed in a
redundant configuration (when XTCs are installed in Slots 5 and 6). The ONS 15327 provides 1:1
protection by default. In 1:1 protection, a working card is paired with a protect card of the same type.
Cisco ONS 15327 User Documentation, R3.3
13-2
Chapter 13 Card Reference
June 2002