Cisco ASR 5000 Series, Installation Manual

Page: 37 / 317

ASR 5000 Hardware Platform Overview
Line Cards ▀
ASR 5000 Installation Guide ▄
37
BITS Timing
The Building Integrated Timing Supply (BITS) timing interface is optional and required only when the system is used in
support of non-data applications. A BITS module is available on two versions of the SPIO: one supports an analog E1
BNC coaxial interface (for 2048 kHZ clocking), and the other a T1 (DS1) 3-pin wire-wrap interface (for 1544 kHz
clocking).
If your system is equipped with OLC2 or CLC2 line cards for SDH/SONET, you can configure it to derive system
clocking from a port on either card. This functionality requires that the SPIO includes the optional Stratum 3 clocking
module to distribute clocking to all line cards in the chassis.
Central Office Alarm Interface
The CO alarm interface is a 10-pin connector for up to three dry-contact relay switches for connection to a CO alarm
monitoring panel. The three Normally Closed alarm relays can be wired to support Normally Open or Normally Closed
devices, indicating minor, major, and critical alarms.
A CO alarm cable is shipped with the product so you can connect the CO Alarm interfaces on the SPIO card to your
alarming devices. The “Y” cable design ensures CO alarm redundancy by connecting to both primary and secondary
SPIO cards.