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- Description
- Specifications
The NM-1HSSI is a Cisco 1-port HSSI network module that provides connectivity for links at fractional DS3 speeds and slower, with support for speeds up to 45 Mbps. The module has one HSSI port, labeled HSSI 0, and an enable (EN) LED.
The port is a 50-pin receptacle, color-coded blue. A HSSI DTE cable joins it to an external DSU, and DTE is the default mode of the HSSI port. For back-to-back operation, a HSSI null modem cable links it to another router at the same site, and both routers must use a 51.84-MHz internal clock.
Besides the EN LED, the module has five port LEDs: LB/CN (loopback/connect), RC (receive clock), RD (receive data), TC (transmit clock) and TD (transmit data). LB/CN is green in normal operation with the DSU connected, yellow in loopback mode, and off when the port is neither connected nor in loopback.
The module fits the Cisco 3600 and 3700 series, and the Cisco 2691, 2811, 2821 and 2851 also take it, while the Cisco 2801 does not. Router pages in the store include CISCO2811 Cisco 2811 router and CISCO2821 Cisco 2821 router, and more modules are in Cisco interface cards.
| Part number | NM-1HSSI |
| Type | 1-port HSSI network module |
| Ports | 1 x HSSI |
| Port connector | 50-pin receptacle, blue |
| Link speed | Up to 45 Mbps |
| Supported links | Fractional DS3 speeds and slower |
| Default mode | DTE |
| Cables | HSSI DTE cable (to external DSU); HSSI null modem cable (back-to-back) |
| Back-to-back clock | 51.84-MHz internal clock on both routers |
| LEDs | EN; LB/CN, RC, RD, TC, TD |
| Compatible with | Cisco 2691, 2811, 2821, 2851, 3600 series and 3700 series routers (not the Cisco 2801) |