E1/T1 PCI card installation guide
7
There are three broad categories of Multi-channel path provided by the card;
1. E1 (G703) ports — 30, 60 or 120 calls (2Mbit system or ISDN)
or
2. T1 (G703) ports - 23/24, 46/48 or 92/96 calls (1.554Mbit T1 system or T1 PRI)
3. The
H.100
CTBus
Additionally, any one source of speech or data may be distributed to a number of separate sinks,
but it is not possible via switching on the card alone for more than one source to feed a single
sink. This conferencing function is only possible with the use of extra processing power of
Aculab Signalling DSP modules or with third party conferencing cards.
Full details on the switching of calls using the E1/T1 PCI card are available in a separate
publication, the
Aculab Switch Control API Guide
. This guide can be downloaded from the
company web site at
www.aculab.com
1.6
H.100 CTBus termination
The E1/T1 PCI card can occupy any position in a ‘chain’ of H.100 CTBus devices interconnected
with a suitable ribbon cable. If the E1/T1 PCI card is the first or last device, at either end of a
‘chain’ then the termination function (-ht) of the device driver configuration switches must be
set. See the ‘
Aculab Call, Switch & Speech Driver Installation Guide
’. If the E1/T1 PCI card is in
the middle of a ‘chain’ of H.100 CTBus devices, then the termination function is not used.
See the following diagram for the position of the H.100 CTBus termination indicator LED. The
LED is on when ever the card is terminated and as such can be used to identify the terminated
cards in a system. For easier visibility, the LED is located on the top edge of the card on
hardware revisions 1.5 and later.
Lucent
(Agere
)
H100 Termination LED
rev 1.5
rev 1.2
1.7
H.100 CTBus loading
The E1/T1 PCI card has a loading factor of 1 on the H.100 CTBus. The maximum loading
allowed on the H.100 CTBus is 20. The total loading is calculated by adding the loading factor
of all the devices on a single H.100 CTBus. The loading limit of H.100 means that no more than
20 E1/T1 PCI cards can be used in the same host.
1.8
E1/T1 PCI card - Host Interface
A device driver program, running on the host computer, controls the behaviour of the E1/T1 PCI
card.
The driver accesses the card via a control space within an area of shared RAM. This shared area
is a block of memory physically resident on the card that appears as a normal area of memory in
the memory map of the host computer.
For information on device driver installation and configuration, please refer to the Aculab
publication ‘
Call, Switch and Speech Driver Installation Guide
’. This guide can be downloaded
from
http://www.aculab.com