Maintenance strategy
Service codes
42
Maintenance Procedures
December 2003
Peak noise level
on page 42 shows the peak noise level.
Echo path delay
•
Analog port to analog port — < 3 ms
•
Digital interface port to digital interface port — < 2 ms
Service codes
Service codes (for the United States only) are issued by the Federal Communications Commission (FCC)
to equipment manufacturers and registrants. These codes denote the:
•
Type of registered terminal equipment
•
Protective characteristics of the premises wiring of the terminal equipment ports
Private-line service codes are as follows:
•
7.0Y — Totally protected private communications (microwave) systems
•
7.0Z — Partially protected private communications (microwave) systems
•
8.0X — Port for ancillary equipment
•
9.0F — Fully protected terminal equipment
•
9.0P — Partially protected terminal equipment
•
9.0N — Unprotected terminal equipment
•
9.0Y — Totally protected terminal equipment
The product line service code is 9.0F, indicating it is terminal equipment with fully protected premises
wire at the private line ports.
Table 18: Peak noise level
Type of
connection
Peak noise level
(dBrnC)
1
1 Decibels above reference noise with C-filter
Analog to analog
20
Analog to digital
19
Digital to analog
13
Summary of Contents for CMC1
Page 1: ...Maintenance Procedures 555 245 103 Issue 1 1 December 2003 ...
Page 14: ...Contents 14 Maintenance Procedures December 2003 ...
Page 416: ...Additional maintenance procedures IP Telephones 416 Maintenance Procedures December 2003 ...
Page 426: ...Index X 426 Maintenance Procedures December 2003 ...