Datasheet

2-23
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 2 Common Control Cards
2.7.3 Orderwire
• Local NE alarm severity: A hierarchy of Not Reported, Not Alarmed, Minor, Major, or Critical
alarm severities that you set to cause output closure. For example, if the trigger is set to Minor, a
Minor alarm or above is the trigger.
• Remote NE alarm severity: Same as the local NE alarm severity but applies to remote alarms only.
• Virtual wire entities: You can provision any environmental alarm input to raise a signal on any
virtual wire on external outputs 1 through 4 when the alarm input is an event. You can provision a
signal on any virtual wire as a trigger for an external control output.
You can also program the output alarm contacts (external controls) separately. In addition to
provisionable triggers, you can manually force each external output contact to open or close. Manual
operation takes precedence over any provisioned triggers that might be present.
2.7.3 Orderwire
Orderwire allows a craftsperson to plug a phone set into an ONS 15454 SDH and communicate with
craftspeople working at other ONS 15454 SDH nodes or other facility equipment. The orderwire is a
pulse code modulation (PCM) encoded voice channel that uses E1 or E2 bytes in the MSOH and in the
regenerator section overhead.
The AIC-I allows simultaneous use of both local (RSOH signal) and express (MSOH signal) orderwire
channels on an SDH ring or particular optics facility. Express orderwire also allows communication
through regeneration sites when the regenerator is not a Cisco device.
You can provision orderwire functions with CTC similar to the current provisioning model for GCC
channels. In CTC, you provision the orderwire communications network during ring turn-up so that all
network elements (NEs) on the ring can communicate with one another. Orderwire terminations (that is,
the optics facilities that receive and process the orderwire channels) are provisionable. Both express and
local orderwire can be configured as on or off on a particular SDH facility. The ONS 15454 SDH
supports up to four orderwire channel terminations per shelf. This allows linear, single ring, dual ring,
and small hub-and-spoke configurations. Keep in mind that orderwire is not protected in ring topologies
such as multiplex section-shared protection ring (MS-SPRing) and subnetwork connection protection
(SNCP).
Caution Do not configure orderwire loops. Orderwire loops cause feedback that disables the orderwire channel.
The ONS 15454 SDH implementation of both local and express orderwire is broadcast in nature. The
line acts as a party line. Anyone who picks up the orderwire channel can communicate with all other
participants on the connected orderwire subnetwork. The local orderwire party line is separate from the
express orderwire party line. Up to four STM-N facilities for each local and express orderwire are
provisionable as orderwire paths.
Note The OC3 IR 4/STM1 SH 1310 card does not support the EOW channel.
The AIC-I supports selective dual tone multifrequency (DTMF) dialing for telephony connectivity,
which causes specific or all ONS 15454 SDH AIC-Is on the orderwire subnetwork to “ring.” The
ringer/buzzer resides on the AIC-I. There is also a “ring” LED that mimics the AIC-I ringer. It flashes
when a call is received on the orderwire subnetwork. A party line call is initiated by pressing *0000 on
the DTMF pad. Individual dialing is initiated by pressing * and the individual four-digit number on the
DTMF pad. The station number of the node is provisioned in CTC.