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Hardware Installation Guide for Polycom SoundStructure TEL1 and TEL2
Connecting To The Telephone Line
SoundStructure TEL1
The SoundStructure TEL1 has a LINE interface that should be connected to the telephone line that comes
from the local PBX or directly from the telephone central office. As shown in the following figure, the LINE
interface is typically connected to the telephone wall plate that serves as the PSTN connection and the
SoundStructure TEL1 PHONE interface is available to support an optional telephone handset.
The optional telephone handset may be used when privacy is required or for initiating a telephone call.
When the TEL1 LINE interface is on-hook (in other words, hung up), the telephone line that is plugged into
the LINE connector is passed through to the PHONE interface, allowing the telephone handset to hear dial
tone and initiate calls once the optional handset is taken off-hook.
LAN
When the SoundStructure TEL1 device takes its LINE interface off-hook by using the SoundStructure API
(See the SoundStructure Command Reference manual) phone_connect command, the audio from the
telephone LINE interface is routed through the SoundStructure TEL1 and into the SoundStructure for audio
processing. When off-hook, the TEL1 seizes the line from the handset and will not release it to the handset
until the TEL1 is placed back on-hook (in other words, hung-up).
To use the optional telephone handset when the SoundStructure TEL1 interface is off-hook, take the
handset off-hook by using the API command phone_connect and set the value to 0 for that telephone line.
This will release the telephone audio paths from the SoundStructure device and re-enable them to the
PHONE interface. The handset is then active and can be used to transmit and receive audio. Hanging up
the handset at this point will terminate the telephone call.
Polycom, Inc.
PHONE
LINE
OBAM
IR
C-LINK2
IN
OUT
12V
PIN 2: TXD
PIN 3: RXD
PIN 5: GROUND
PIN 7: CTS
PIN 8: RTS
REMOTE CONTROL 1
RS-232
REMOTE CONTROL 2
6
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