8RS232 Interface Card

Description

The 8RS232 interface card for Loop-O9500R, Loop-O9550-A, and Loop-AM3440 series has 8 interface ports. For the RJ version, 8 RJ48 connectors are available in Asynchronous/Sync mode. The sync mode method used is oversampling at 64 Kbps, the max data rate for each RJ48 is 19.2 Kbps only available in some ports. For the DB version, 2 RJ48 provide 2 ports and 2 DB44 connectors provide 3 ports each. Two cables are included. Each cable converts from DB44 connector to two DB25 and one DB9 connectors.

For asynchronous signals, the card can be used in either INDEPENDENT mode or MUX mode. In the INDEPENDENT mode, each of the 8 asynchronous ports up to 38.4 Kb/s rate, is assigned a separate 64 Kb/s channel. In the MUX mode, up to 5 ports, each up to 9.6 Kb/s, can share a single 64 Kb/s channel. The remaining 3 ports will be multiplexed to another 64Kb/s channel.

For synchronous signals only four of the ports can be used, leaving another 4 ports as asynchronous. In the INDEPENDENT mode, each of the 4 synchronous ports can be up to 64 Kb/s. The rest of the 4 asynchronous ports, each up to 38.4 Kb/s rate, is assigned a separate 64 Kb/s channel per port. In the MUX mode, the 4 synchronous ports, each up to 9.6 Kb/s, share a single 64 Kb/s channel. The other 3 asynchronous ports will be multiplexed to another 64Kb/s channel.

The 8RS232 interface card uses the multiplexing format defined in ITU-T X.50 Div.2 and in X.54 for rates below 64 Kbps. For 64 Kbps transport, standard RS232 format is used. In the INDEPENDENT mode when only one subrate signal is transported, the unused bandwidth is filled with "1s".

Note: Although the 8RS232 Interface Cards serve the same hardware function on O9500R, O9550, and AM3440, they have different firmware.