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- Description
- Specifications
One BNC port on the NM-1A-T3 joins a Cisco router to a T3 network over coaxial cable. The NM-1A-T3 is a Cisco 1-port DS3 ATM network module for high-bandwidth data applications, and it sits beside an ATM E3 module and a combined ATM T3/E3 module in the same Cisco network module range.
The ATM side covers multiprotocol encapsulation over AAL5 (RFC 1483), classic IP over ATM (RFC 1577), Point-to-Point Protocol over ATM and LAN Emulation. The T3 receiver is sensitive, and a short T3 cable can saturate it and cause bit errors. The cure is to lower the transmit level of the attached device through its line build-out setting, or to insert a 4-dB attenuator on the receive side of the module.
Host routers are the Cisco 2600 series, 2811, 2821, 2851, 3600 series, 3700 series and 3800 series, listed in the Cisco router category. Neighbouring ATM and WAN modules are in the Cisco interface card category.
| Part number | NM-1A-T3 |
| Type | 1-port DS3 ATM network module |
| Port | 1 x T3, BNC coaxial |
| Cabling | Coaxial cable to the T3 network |
| ATM support | AAL5 (RFC 1483), classic IP over ATM (RFC 1577), PPP over ATM, LAN Emulation |
| Short T3 cable | Reduce transmit level (line build-out) or add a 4-dB attenuator on the receive side |
| Compatible with | Cisco 2600 series, 2811, 2821, 2851, 3600 series, 3700 series, 3800 series routers |