| B1 | -OCXO reference oscillator |
| B19 | GSM1900 Mobile & Base Station Test |
| B3 | -Reference frequency iput/output |
| B4 | -Fast power ramp, phase/frequency error & Ber measurement |
| B41 | -AF measurement unit with frequency counter |
| B42 | -High-Dynamic Burst Analyzer |
| B43 | -GSM900/1800/1900-specific measurement |
| B44 | -Multitone generator & analyzer |
| B5 | -Real tiem speech coder/decoder |
| B51 | -Internal GSM full rate (FR) & enhancedfull rate (EFR) speech coder/decoder |
| B52 | Universal Speech Codec |
| B6 | -TDMA signals & adapter for CMD-B6X options |
| B61 | -IEC/IEEE-bus interface |
| B62 | Memory Card Interface |
| B9 | 2nd RF Synthesizer |
| K43 | - |
| U11 | - |
| U12 | Modification For Fast BER Capability |
| U18 | - |
| U20 | - |
| U21 | Unknown |
| U7 | High Speed |
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