Nortel BCM50 Installation And Maintenance Manual page 44

44 Chapter 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
464 section 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.
page 45 shows the GASM.
N0027152 01 N0027152 01
Figure 12 on