Do I need 909 Universal Coupler? 1

[Ding07]

I need to add second music-on-hold to the system (S8700 ACM4). Currently, our first and the only music-on-hold source (a CD player) is connected to an AUX Trunk port "through" a device called "909 Universal Coupler". Is this device required for any external music-on-hold device? Thanks in advance for your advices!

 

[dufus2506]

Short answer: Yes.


Long answer:

The universal coupler is used to balance the impedance of the two devices. (PBX and Playback equipment.)

A phone circuit is usually a 600 ohm circuit. The output of a line-out connection on a CD player is not. (Usually right around 100 ohms.) If you connected them directly, you'd have a circuit path through the playback device that has a lower impedance than would normally be expected by the PBX. This can strain the circuit card in the PBX by putting a higher current load on it's components.

Other playback objects may present 4 ohm or 8 ohm connections. The universal coupler makes sure that the connection to the PBX is 600 ohms (like it should be) and isolated from the device providing music (across a transformer) preventing a high-current condition in the circuit card.

Carpe dialem! (Seize the line!)

 

[Ding07]

Thank you dufus2506 for your valuable information!

 

[dufus2506]

If you're adding new playback devices, there are some out there on the market that are specifically designed to be connected to PBX equipment.

My current favorite devices are those made by On-Hold plus.

http://www.onholdplus.com/

Their equipment can provide a native 600 ohm connection. This device wouldn't need the universal coupler, and could connect directly to the PBX analog or aux trunk lines.

Another advantage to these devices is that they have no moving parts. So, unlike a CD player (which should be periodically replaced to prevent failure while a caller is holding) they tend to last longer and need very little attention.

Carpe dialem! (Seize the line!)

 

[Ding07]

dufus2506,

Thanks again for the link! The device we will install will be provided by one of our clients and we have no choice. TELink 1200a will be the device.

 

[AvayaTier3]

Different music for different PNs:

Two sites, PN1 Main Server location and PN2 ESS / LSP Server

On Site A "change system-parameters features"

Music/Tone on Hold: music Type: group 1

change moh-analog-group 1                                       Page   1 of   4
                                  MOH GROUP 1

                          Group Name: Music-on-Hold

MOH SOURCE LOCATION
  1: 01C0806     16:             31:             46:             61:
  2: 02A0805     17:             32:             47:             62:

PN1 users hear the music from 01C0806
PN2 users hear the music from 02A0805 (the nearest music source).

This does not require tenant partitioning.

If tenant partitioning is “y” then you do “change music”

Use group instead of port

A great teacher, does not provide answers, but methods to teach others "How and where to find the answers"

bsh

35 years Bell, AT&T, Lucent, Avaya
Tier 3 for 25 years and counting

http://bshtele.com