Cisco ONS 15454 DWDM - Table 15-13 BITS External Timing Pin Assignments; Timing Connections

15-46
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
September 2005
Chapter 15 Shelf Hardware Reference
15.14.2 Timing Connections
Audible alarm contacts are in the LOCAL ALARM AUD pin field and visual contacts are in the LOCAL
ALARM VIS pin field. Both of these alarms are in the LOCAL ALARMS category. User-definable
contacts are in the ENVIR ALARM IN (external alarm) and ENVIR ALARM OUT (external control)
pin fields. These alarms are in the ENVIR ALARMS category; you must have the AIC-I card installed
to use the ENVIR ALARMS. Alarm contacts are Normally Open (N/O), meaning that the system closes
the alarm contacts when the corresponding alarm conditions are present. Each alarm contact consists of
two wire-wrap pins on the shelf assembly backplane. Visual and audible alarm contacts are classified as
Critical, Major, Minor, and Remote. Figure 15-42 on page 15-45 shows alarm pin assignments.
Visual and audible alarms are typically wired to trigger an alarm light or bell at a central alarm collection
point when the corresponding contacts are closed. You can use the ACO pins to activate a remote ACO
for audible alarms. You can also activate the ACO function by pressing the ACO button on the
TCC2/TCC2P card faceplate. The ACO function clears all audible alarm indications. After clearing the
audible alarm indication, the alarm is still present and viewable in the Alarms tab in CTC.
15.14.2 Timing Connections
The ONS 15454 ANSI backplane supports two building integrated timing supply (BITS) clock pin
fields. The first four BITS pins, rows 3 and 4, support output and input from the first external timing
device. The last four BITS pins, rows 1 and 2, perform the identical functions for the second external
timing device. Table 15-13 lists the pin assignments for the BITS timing pin fields.
Note For timing connection, use 100-ohm shielded BITS clock cable pair #22 or #24 AWG (0.51 mm²
[0.020 inch] or 0.64 mm² [0.0252 inch]), twisted-pair T1-type.
Note Refer to Telcordia SR-NWT-002224 for rules about provisioning timing references.
Table 15-13 BITS External Timing Pin Assignments
External Device Contact Tip and Ring Function
First external device A3 (BITS 1 Out) Primary ring (–) Output to external device
B3 (BITS 1 Out) Primary tip (+) Output to external device
A4 (BITS 1 In) Secondary ring (–) Input from external device
B4 (BITS 1 In) Secondary tip (+) Input from external device
Second external device A1 (BITS 2 Out) Primary ring (–) Output to external device
B1 (BITS 2 Out) Primary tip (+) Output to external device
A2 (BITS 2 In) Secondary ring (–) Input from external device
B2 (BITS 2 In) Secondary tip (+) Input from external device