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Technical Specifications
10-4 Issue 3 June 2001
T1 Carrier Low-Speed (BBF6 T1EXT) 10
â– Electrical Specification
The T1 carrier low-speed interface (T1EXT) transmits and receives a
standard electrical T1 carrier signal as specified in CB No. 113, Issue 2,
April 1978. The T1EXT supports two interfaces. Line coding is
provisionable to AMI with or without B8ZS. The following are specifications
for the driver/receiver:
— Driver Output: 3 V peak pulse
— Receiver Gain: 35 dB maximum at 772 KH
— Receiver Dynamic Range: 0 to 35 dB (no pad at input).
The driver/receiver does not require any special provisioning to support up
to 6,000 feet of 22-gauge copper cable (at 22 degrees Celsius) used in a
T-Carrier system.
The T1EXT will support a single span of the following distances:
— In a central office: up to 3000 feet (±1500 feet)
— In an outside plant cabinet or wall DT: up to 6,000 feet.
The 60 mA constant current regulator will support a simplex loop
resistance of 221 ohms.
— The T1EXT does not support fault locating using bipolar violations
— The T1EXT can interface with "looping regulator" type repeaters
only
— The T1EXT does not have the capability to loop the simplex current
back to a T1 line repeater
— The T1EXT does not include any components for primary or
secondary lightning protection/surge protection or power cross.
Primary protection (Lucent Technologies' protector unit 4B3EW or
equivalent) is always required for tip/ring lines exposed to lightning
and surges either in cabinet or as lines enter a building. An external
secondary lightning and surge protection assembly (ED-8C783)
must be collocated with the DDM-2000 shelf for all outside plant
applications. Refer to Figure 10-1 for T1EXT span powering.
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