Specifications

TN746B analog line (16 ports)
Issue 6 February 2007 229
TN746B analog line (16 ports)
Note:
Note: This circuit pack is no longer sold.
The TN746B analog line circuit pack has 16 ports. Each port supports one telephone.
Supported auxiliary equipment includes:
● fax machines,
● answering machines,
● modems, and
● amplifier handsets.
The TN746B circuit pack supports on-premises building wiring with either touchtone or rotary
dialing, and with or without the LED and neon message waiting indicators. The TN746B circuit
pack supports off-premises wiring with either DTMF dialing or rotary dialing. Off-premise wiring
occurs out-of-building only with certified protection equipment. LED or neon message waiting
indicators are not supported off-premises. The TN746B circuit pack provides -48 V DC current
in the off-hook state. Ringing voltage is -90 V DC.
The TN746B, along with a TN755B neon power unit per carrier or per single-carrier cabinet,
supports on-premises telephones. These telephones are equipped with neon message waiting
indicators. The TN746B circuit pack supports three ringer loads. Only one telephone can have
an LED or neon message waiting indicator.
TN746B supports A- and Mu-Law companding and administrable timers. The TN746B supports:
● Queue warning-level lights that are associated with the direct department calling (DDC)
features and the uniform call distribution (UCD) features
● Recorded announcements that are associated with the Intercept Treatment feature
● PagePac paging system for the Loudspeaker Paging feature
Additional support is provided for external alerting devices. These devices are associated with
the Trunk Access from Any Station (TAAS) feature, neon message waiting indicators, and
modems. Secondary lightning protection is provided on the TN746B circuit pack. The TN746B
circuit pack supports up to eight ports simultaneously-ringing. The system can achieve the
maximum of eight ports ringing simultaneously. To do so, the system uses four ports from the
set of ports numbered one through eight and four ports from the set of ports numbered 9
through 16.
Combined conversion of Modem Pooling requires a port for each combined resource that is to
be supported. One port must be on a TN754 and another port on a TN742, TN746B or TN769
Analog circuit pack.