SYSTEM OVERVIEW
The Network Communications Module (NCM) is an Asynchronous Data Module designed for RFL IMUX 2000 T1 and E1 Multiplexers. The NCM provides one DCE
The NCM in NMS application mode is not required for T1, but could be utilized to speed up network communications, or provide a communication path to remote locations. The NCM is required for E1 systems, because an out of network communication path does not exist.
The NCM supports
The NCM supports either one or two ports depending on the interface installed. Each port includes a UART, and can transmit to and receive from the T1/E1 bus, and transmit to and receive from one another, depending on the configuration and application. The ports support 38.4k, 19.2k, 9600, 4800 and 2400 baud, support 7 or 8 data bits, and support Even, Odd, Mark Space and No Parity.
The NCM utilizes a proprietary communication protocol over T1/E1 consisting of two data and two idle/address frames. The two data frames make up the entire data package, and are transmitted and received in consecutive frames. The idle/address frames occur only during
The NCM does not support signaling bits within the T1/E1 data stream, however, the CAS setting on the NCM module will “block” the selection of timeslot 16 for an E1 multiplexer using CAS, preventing the NCM from potentially disrupting other modules in the network.
The NCM supports “Address Passing” and “Character Pacing” in the NMS Mode of operation. “Address Passing” qualifies messages prior to sending them out of port (#2) to the
A Rogue Control feature is available which prevents a rogue PC program or another module from “stepping” on the NCM time slot, and bringing down the entire NCM Path.
RFL NCM |
| RFL Electronics Inc. |
November 6, 2007 | 21 | (973) |