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Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter2 Common Control Cards
2.7.3 Orderwire
•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 pre sent.
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 SDHs or other facility equipment. The orderwire is a pulse
code modulation (PCM) encoded voice channel that uses E1 or E2 bytes in the multiplex section
overhead and in the regenerator section overhead.
The AIC-I allows simultaneous use of both local (section overhead signal) and express (line overhead
signal) orderwire channels on an SDH ring or particular optics fac ility. Express orderwire also allows
communication via 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 duri ng ring turn-up so that all
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 ca n
be configured as on or off on a particular SDH facility. The ONS15454 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 conn ection 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 express or derwire (EOW) channel.
The AIC-I supports selective dual tone multifrequency (DTMF) dialing for telephony connectivity,
which causes specific or all ONS15454 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.
The orderwire ports are standard RJ-11 receptacles. The pins on the orderwire ports corre spond to the
tip and ring orderwire assignments.