Dedicació al treball de cures i a les feines de la llar

An external shielded cable connects the MA-235-1 and MA-235-2 module adapter pair. The adapters operate in line redundancy with a pair of CM-5RB modules. The module adapters are implemented separately to allow replacement of a failed adapter without interruption of service. The MA-235-1 adapter is the Primary Module Adapter and the MA-235-2 adapter is the Backup Module Adapter in line redundancy applications. Each has an RJ-48 T1 interface with channel service unit (CSU) protection. The combined adapters in both common modules bridge timing in and serial I/O connectors. A single timing out connector is provided and connected to the currently active common module. Timing in and timing out signals are transmitted on separate RJ-11 connectors. Table 3-4 gives MA-235-1 input and output port assignments, Table 3-5 gives MA-235-2 input and output port assignments, and Figure 3- 8 shows connector locations. An external removable shielded cable (CA-202, 26-pin miniature Sub-D) provides signal connection between the MA-235-1 and MA-235-2 adapters.

Table 3-4. MA-235-1 I/O Ports

Port Connector Type Protocol Comments Signals Pin Assignments

Timing In 6-pin phone

jack RS-422 Balanced timing in

(1.544 MHz) TIMING IN+ and TIMING IN-

1- External primary positive (+) 2- External primary negative (-) 3- External timing source select 4- Signal ground

5- Ext. secondary positive (+) or CM-5R-TD delay positive (+) 6- Ext. secondary negative (+) or CM-5R-TD delay negative (+)

Timing Out 6-pin phone

jack RS-422 Balanced timing out

(1.544 MHz) TIMING OUT+ and TIMING OUT- 1- External positive (+) 2- External negative (-) 3- Signal ground 4- Signal ground

5- Aux. positive (+) not defined 6- Aux. negative (-) not defined T1/E1

Primary

8-pin phone

jacks T1/E1 Port has electrical

protection per FCC part 68 for connection to a public network RXTIP, RXRING, TXRING, and TXTIP

1- Receive from network, ring 2- Receive from network, tip 3- Not used

4- Send towards network, ring 5- Send towards network, tip 6- Not used

7- Frame ground (transmit) 8- Frame ground (receive) MA-235-1

to MA-235-2 Comm

26-pin

subminiature D TTL External cable required (with package, CA-202)

Various Pinouts not necessary

Table 3-5. MA-235-2 I/O Ports

Port Connector Type Protocol Comments Signals Pin Assignments

Remote

Port 6-pin phone jack RS-232 _RS-485 Standard ISiCL port

interface RXDATA, TXDATA, GND, RS485- and RS485+ 1- RS-485 negative (-) 2- RS-232 transmit 3- Not used 4- RS-232 receive 5- Signal ground 6- RS-485 positive (+) DI 6-pin phone

jack TTL Future use

T1/E1

Backup 8-pin phone jacks T1/E1 Port has electrical

protection per FCC part 68 for connection to a public network RXTIP, RXRING, TXRING and TXTIP

1- Receive from network, ring 2- Receive from network, tip 3- Not used

4- Send towards network, ring 5- Send towards network, tip 6- Not used

7- Frame ground (transmit) 8- Frame ground (receive) MA-235-1

to MA-235-2 Comm

26-pin

Figure 3-8. MA-235-1 and MS-235-2 Face Plates and Connector Locations

Each module adapter has a DIP-style switch for system setup. Table 3-6 shows the MA-235-1 Switch 1 functions and settings, and Table 3-7 shows the MA-235-2 Switch 1 functions and settings. You must configure these switches before installing the module adapters in the shelf.

Table 3-6. MA-235-1 Switch 1 Functions and Settings

Positions Factory Default Description

1 On This switch position controls the external timing input impedance (120 ohms; TIMING

IN port). This switch is normally set to On. When using a daisy chain configuration, the last multiplexer in the chain should have this switch On, and the others should be Off.

2 On This switch controls the input impedance of the time delay control port when using the

optional time delay capability. It is normally set to On.

Table 3-7. MA-235-2 Switch 1 Functions and Settings

Positions Factory Default Description

1 and 2 On Operating Mode: TERM = SW 1, Position 1 and Position 2 both On

DI-A = SW 1, Position 1 On and Position 2 Off DI-B = SW 1, Position 1 Off and Position 2 On SPARE = SW 1, Position 1 and Position 2 both Off

3 On Not used

4 and 5 On This switch position controls the bias of the RS-485 portion of the remote port (used

for daisy chaining remote ports). For normal operation, Switch 1, Position 4 and 5 should both be set in the On (bias) position. When using a daisy chain configuration, two module adapters in the chain should have these switches On and the others should be Off. Note that Positions 4,5,6 should be set as a group (that is, all On or all Off).

6 On Switch 1, Position 6 controls the termination impedance (120 ohms) for the RS-485

portion of the remote port. This Switch 1, Position 6 should be set in the On position. When daisy chaining, the last multiplexer in the chain should have this switch on, and the others should be Off. Note that Positions 4,5,6 should be set as a group (that is, all On or all Off).

The MA-235-1 and MA-235-2 module adapter pair is connected by an external shielded cable and are designed to operate in line redundancy with a pair of CM-5RB modules. These module adapters are implemented separately to allow replacement of a failed adapter without interruption of service. The MA-235-1 adapter is the primary module adapter and the MA-235-2 adapter is the backup module adapter in line redundancy applications. Each has an RJ-48 T1 interface with CSU protection. The combined module adapters bridge timing in and serial I/O connectors to both common modules. A single timing out connector is provided and is connected to the currently active common module. Timing in and timing out signals are transmitted on separate RJ-11 connectors.

In the event that a common module failure occurs during operation, you can remove and replace the CM-5RB common module without interruption of service. Before installing a replacement for the primary CM-5RB module, you should pre-configure the line interface settings of the CM-5RB module by installing the module in an unused card slot and using the front panel switch to set

● Framing type. ● Line code.

● Transmit line build out.

The unlikely event of the MA-235-1 or MA-235-2 failure is treated like a line failure, in that module and line switching occur. As long as T1 data is not flowing between the module adapters (most likely caused by a module only switch due to module adapter failure) you can hot-swap either one of the line-redundant module adapters without disturbing traffic through the adjacent adapter. Hot-swapping in this manner requires removing the external shielded cable between the two adapters. To hot-swap an adapter, you need to first remove the corresponding common module and then remove the interconnecting cable (CA-202). Perform this procedure to replace the failed adapter.

To replace a MA-235-1 or MA-235-2 module adapter, perform these steps: 1. Remove the corresponding common module.

2. Remove the MA to MA cable (CA-202). 3. Remove the failed adapter.

4. Install the new adapter. 5. Install the MA to MA cable.

6. Install the corresponding common module.

The modules then go through the revertive process per the module line redundancy settings.