Specifications

9-2

Cisco MGX 8260 Command Line Interface Guide

Release 1.2, Part Number 78-10987-01 Rev. B0, January, 2002

Chapter 9 Command Reference

Understanding Bitmaps

The MGX-8260 command line interface reports some parameters as binary bitmaps. A bitmap is a

compact way of representing multiple binary indicators using a single decimal value. To interpret the

bitmap, you must convert it to a binary number and then interpret the individual bit positions.

For example, the MGX-8260 Media Gateway reports the card service type as a decimal value that

indicates one of four possible service types. To interpret the decimal value, convert it to a binary value

using a decimal to binary conversion tool such as the Microsoft Calculator in the scientific mode.

Assume the MGX-8260 command line interface reports a decimal value of 4. The binary equivalent is

0100. Each bit of the binary number is mapped to a specific card service type:

A bit position is set when it contains a one. In this case, the binary value sets bit position two. To

determine the card service state, use the following service translation table:

Therefore, the service state is Voice. In this example the bit positions are mutually exclusive because

you can only have one service state at a time. There following values are possible:

The values of other bitmaps, such as alarm bitmaps, are not mutually exclusive, and any value is

permitted. The conversion process is the same in both cases.

Table 9-1 Binary Bits versus Binary Values

Bit Position 3210

Binary Value 0100

Table 9-2 Bitmap Translations

Bit position Service

Bit 0 ATM (reserved for future use)

Bit 1 Frame Relay (reserved for future use)

Bit 2 Voice

Bit 3 IP Emulation (reserved for future use)

Table 9-3 Valid Bitmaps for Service State

Decimal value Binary value Service

10001ATM

2 0010 Frame Relay

40100Voice

8 1000 IP Emulation