A-4 System Standards and Specifications

Model No.
Running Head
A.4 Port Specifications

A.4.1 WAN port Specifications

WAN ports

Physical

Performance and Test Options

Loopbacks Line, Local, Loopback Generation and Detection, (ESF only)
T1 National Bit Supporting (G.704)

T1 Interface

Bit Rate and Tolerance 1.544 Mbps + 32 ppm
Number of T1 WAN ports 4
Electrical Interface Per ANSI T1.102/T1.403, DSX-1 1001/2 balanced
Line Coding Software selectable AMI or B8ZS
Frame Format Software selectable D4 or ESF
D4 Framing Normal Superframe
ESF Framing Extended Superframe
Voice Channel Signaling AT&T PUB 43801, AT&T 62411, ITU-T Q.421, Q.422 using
robbed-bit method.
Error Detection
Frame Format Error Scheme
ESF CRC-6, Controlled Slip, Out of Frame
D4 BiPolar Violation, Controlled Slip, Out of Frame
Alarm Indication As per Bellcore TR-TSY-000191
Line Length Software Slectable: Adjustable line build out (LBO) settings for 110,
220, 330, 440, 550, 660 feet and 0dB, 7.5dB, 15dB and 22.5dB
Power Levels Complies with ANSI T1.403 and ITU-T G.703
Output Jitter Complies with ITU-T G.824
Input Jitter and Wander Complies with ITU-T G.824
Standards Compatibility
AT&T TR43801 Digital Channel Bank Requirements and Objectives
TR54016 Requirements for Interfacing Digital Terminal Equipment to
Service Employing the Extended Superframe Format
TR62411 Accunet 1.5 Service, Description and Interface Specifications
Bellcore TR-TSY-000191 Alarm Indication Signal, Requirements and Objectives
ANSI T1.101 Synchronization Interface Standards for Digital Networks
T1.107 Digital Hierarchy - Formats Specifications
T1.403 ISDN, Network-to-Customer Installation -DS1 Metallic I/F
T1.408 ISDN Primary Rate
ITU-T G.703 Physical/Electrical Characteristics of Hierarchical Digital I/F
G.704 Synchronous Frame Structure Used At Primary and Secondary
Hierarchical Levels
G.824 The Control of Jitter and Wander Digital which are based on
the 1544 Kbits/sec Hierarchy.
Q.421 Digital line signaling code
Q.422 Clauses for exchange line signaling equipment