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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
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Chapter 1 Cisco ONS 15310-MA SDH Shelf Assembly Hardware
Fan-Tray Assembly
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).
Note The Cisco ONS 15310-MA SDH Orderwire functionality is compatible with Cisco ONS 15454
Orderwire functionality.
Caution Do not configure orderwire loops. Orderwire loops cause feedback that disables the orderwire channel.
The ONS 15310-MA 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.
The FTA supports selective dual tone multifrequency (DTMF) dialing for telephony connectivity, which
causes specific or all ONS 15310-MA SDH FTAs on the orderwire subnetwork to “ring.” The
ringer/buzzer resides on the FTA. There is also a “ring” LED that mimics the FTA 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.
The orderwire ports are standard RJ-11 receptacles. The pins on the orderwire ports correspond to the
tip and ring orderwire assignments.
Table 1-9 describes the orderwire pin assignments.
When provisioning the orderwire subnetwork, make sure that an orderwire loop does not exist. Loops
cause oscillation and an unusable orderwire channel.
Figure 1-14 shows the standard RJ-11 connectors used for orderwire ports. Use a shielded RJ-11 cable.
Table 1-9 Orderwire Pin Assignments
RJ-11 Pin Number Description
1 Four-wire receive ring
2 Four-wire transmit tip
3Two-wire ring
4Two-wire tip
5 Four-wire transmit ring
6 Four-wire receive tip
