Nortel Networks BCM50 manual Analog station media bay modules

44Chapter 2 Introducing the BCM50 hardware

Figure 11 4x16 faceplate LEDS and connectors

Analog station media bay modules

The analog station media bay modules (ASM8, ASM8+, and GASM) can connect to a maximum of eight analog telecommunication devices. These devices are standard analog telephones, cordless telephones, fax machines, answering machines, or modems. The maximum speed for a modem connection is 28.8 kbit/s.

In addition to ASM8 features, the ASM8+ and GASM offer the following features:

•Visual Message Waiting Indicator (VMWI): LED indicates to the end user that a message is waiting.

•Disconnect supervision (Open Switch Interval (OSI) as per EIA/TIA 464): indicates to the attached device, in an established communication, that the connected device should release the call (see Disconnect supervision note).

•Caller ID: provides the name, phone number, and other information about the caller, to the end user at the start of the call.

•Firmware downloading capability: allows the core to upgrade the ASM8+ and GASM firmware at customer sites.

•Enhanced ringing capability: ASM8+ and GASM provide a ringing voltage of 2 REN/65 V rms per port.

Disconnect supervision note: When disconnect happens from the Central Office, the ASM8+ provides an open switch interval (OSI) to the off-hook station of 850 ms (TIA/EIA 464 section 5.4.10.2.4, minimum is 600 ms) as a disconnect signal. If the station remains on-hook after the disconnect signal, the ASM8+ disconnects the station equipment from the network without returning a tone to it (TIA/EIA

464section 5.4.10.2.5[1]). After the station equipment goes on-hook, the ASM8+ station interface is restored to on-hook (idle).

It is important to ensure that the device, application, or interface card connected to an ASM8+ station interface conform to these on-hook and off-hook conditions.

The ASM8, ASM8+, and GASM each has one RJ-21 connector on the faceplate. Figure 12 on page 45 shows the GASM.

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