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| Part Number | Description | |
| PVDM-256K-4 | 4-Channel Packet Voice/Fax DSP Module | |
| PVDM-256K-4 | 4-Channel Packet Voice/Fax DSP Module | |
| HWIC-4SHDSL | 4-pair G.shdsl HWIC with IMA support | |
| HWIC-4SHDSL | 4-pair G.shdsl HWIC with IMA support | |
| HWIC-4A/S | 4-Port Async/Sync Serial HWIC | |
| NM-4A/S | 4-Port Async/Sync Serial Network Module | |
| NM-4A/S | 4-Port Async/Sync Serial Network Module | |
| SPA-4XCT3/DS0 | 4-port Channelized T3 to DS0 Shared Port Adapter | |
| SPA-4XT3/E3 | 4-port Clear Channel T3/E3 Shared Port Adapter | |
| PA-4E1G/120 | 4-Port E1 G.703 Serial Port Adapter (120ohm/Balanced) | |
| PA-4E1G/75 | 4-Port E1 G.703 Serial Port Adapter (75ohm/Unbalanced) | |
| PA-4E1G/75 | 4-Port E1 G.703 Serial Port Adapter (75ohm/Unbalanced) | |
| PA-4E | 4-Port Ethernet 10BaseT Port Adapter | |
| PA-4E | 4-Port Ethernet 10BaseT Port Adapter | |
| NM-4E | 4-Port Ethernet Network Module | |
| NM-4E | 4-Port Ethernet Network Module | |
| HWIC-4ESW-POE | 4-Port Ethernet Switch HWIC with Power Over Ethernet | |
| NM-4B-S/T | 4-Port ISDN-BRI Network Module | |
| NM-4B-S/T | 4-Port ISDN-BRI Network Module | |
| NM-4B-U | 4-Port ISDN-BRI with NT-1 Network Module |