Specifications

3.b Hardware Configuration
Fig 3
Normally, no other configuration is necessary to get a Rhino digital telephony card to operate in a system.
In cases where multiple cards are used within the same system, or mixed E1 and T1 modes are needed on
the same card, additional configuration may be necessary.
Timing Cable
A special 20 pin ribbon cable can be used to connect multiple Rhino digital telephony cards to provide a
common clocking source to all spans. In Fig. 3, box 1 shows the location of the Timing cable connector.
Obtain this cable direct from Rhino by contacting Technical Support. Please note that special command
line options must be provided when loading the module to allow for this option to operate as planned.
T1/E1 Span Selector
In cases where all cards of the same type are not configured the same; or when enabling E1 (T1 is the
default configuration). The span selector pin header can be used to select the desired mode for each span.
In Fig. 3, box 2, the span type selection can be made by installing a shorting midgie across the span where
E1 is desired. There are two options for this situation:
NOTE: r1t1 is the module for the Rhino R1T1 PCI Cards. The rxt1 module is for the R2T1 and
R4T1 Cards.
By using insmod, or putting the parameter in modprobe.conf (or a file in the
directory /etc/modules.d/ depending on the distribution). Bit 0 of xx is a 0 to configure span 1 as a T1 or a 1
to configure span 1 as E1. Bit 1 configures span2 etc. Example: t1e1 = 3 configures span 1 as E1, span 2 as
E1, span 3 as T1, and span 4 as T1. All installed cards will have the same configuration. The line looks like:
insmod rxt1.ko t1=xx
To make your Rhino T1 to a Rhino E1:
R1T1 E1 configuration:
insmod /lib/modules/`uname -r`/extra/r1t1.ko e1=1 (OR e1t1override=1)
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