Cabling and Connector Specifications
T1/PRI interface specifications
APX 1000™ Getting Started Guide
C-3
Table C-2 lists CSU and DSX specifications.
T1/PRI cable specifications
The maximum cable distance between the T1/PRI WAN interface equipment and an
APX 1000 unit without CSUs should not exceed 655 feet (200m). Measure the line length and
record it when you install the APX 1000 unit. You must specify this length when you configure
the parameters in the line’s profile.
Use only cables specifically constructed for transmission of T1/PRI signals. The cables must
meet standard T1 attenuation and transmission requirements. The following specifications are
recommended:
•
100-ohm resistance
•
Two twisted pairs, Category 3 or better
The WAN interface cables and plugs described in the following sections are available for the
APX 1000 WAN interfaces.
Table C-2. CSU and DSX specifications
Information
Value
CSU registration
2CZUSA-74421-DE-N
Critical circuitry power source
Dry loop from local ac power source
Line capture frequency
1.544Mbps ± 200bps
Line code
AMI or B8ZS
Line framing
D4 or ESF
Line input/output impedance
100 ohms ± 5%
Received signal level range
DSX-1 level to -36dB
Transmitted signal level
DSX-1 level into 100 ohms
CSU Line buildout
0.0dB, -7.5dB, -15.0dB, or -22.5dB
DSX Line length
1-133ft, 134-266ft, 267-399ft, 400-533ft, or
534-655ft
Pulse density and consecutive zeros
enforcement
In accordance with requirements of AT&T Pub
62411
Line loopback (LLB) set inband code
(10000) repeating binary pattern
Line loopback (LLB) reset inband code
(100) repeating binary pattern