Polycom SpectraLink 1725-36028-001 - Manual (Page 23)

4
Telephone Interface
Configuration
The customer or the customer's wire contractor is responsible for
adhering to all local codes for wiring.
Prepare Demarcation (Demarc) Blocks
The SpectraLink 8000 Telephony Gateway is connected to the existing
telephone system using RJ-21 connections. A SpectraLink 8000
Telephony Gateway is designed to operate with a specific interface to
the telephone system: two-wire digital, two-wire analog, or four-wire
digital. A four-wire system may require two demarc blocks.
Based on the number and type of interfaces in the system, determine
the number of 25-pair cables required to connect telephone line ports
to the demarcation blocks.
If the wiring between the SpectraLink 8000 Telephony Gateway and
the telephone system leaves the building, consult your telephone
system manual for instructions on providing adequate lightning and
other over-current protection.
All SpectraLink 8000 Telephony Gateways (except the TGA116)
are intended only for connection to the isolated side of an on-
premises PBX or key system.
The interfaces are intended to connect to digital PBX ports that
provide signals of 5Vp-p (max) AC components. Some PBXs
provide a 48 V DC offset.
Modem administration
The SpectraLink 8000 Telephony Gateway can also be accessed
remotely using its internal modem and a dedicated telephone line. If
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