Chapter 7. Planning for Media Modules
69
T1, E1, and J1 Line Characteristics
Table 46 summarizes the characteristics according to the type of line.
Table 46. T1, E1, and J1 Line Characteristics
Characteristic
T1
E1
J1
Fractional Support
no
Line Speed
1.544Mbps
2.048Mbps
1.544Mbps
Payload
Clear channel:
1.536Mbps
Clear channel:
1.920 or 1.984Mbps
Clear channel:
1.536Mbps
Clock Extraction
Yes
Yes
No
Connector Type
RJ48C/CA48C
DB15/CA31A
Coaxial:
•
BNC, 75
W
line
impedance
Twisted-Pair:
•
Open wires, 120
W
line impedance
ISO IS8877
Number of Line
Attachments
Up to 4 line attachments per I/O card
Physical Interfaces
Interface type:
•
DS1
•
DSX1
(maximum length of
cable to DSU-end
110 ft.)
Standards
•
AT&T 62411
•
ANSI T1.403
•
EIA IA.547
ITU-T G.703
Interface type:
•
NTT
•
DS1
•
DSX1
(maximum length of
cable to DSU-end
110 ft.)
Standards
•
JT-I411a
•
JT-I431a
•
ANSI T1.403
•
NTT HSDLCS
Code
B8ZS
AMI
HBD3
B8ZS
Frame Format
D4 (SF), D5 (ESF) for:
•
T1.403
•
T1.407
•
AT&T 62411.
•
ITU-T G.703
unstructured
•
ITU-T G.704 with or
without CRC
•
ITU-T G.706 support
for frame alignment /
CRC procedure
NTT-I interface format
Alarm
T1.M1
AT&T 62411
ITU-T G.703
ITU-T G.732
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