Specifications

Functional Description
RADring
Installation & Operation Manual
2-20 Access Modules Functional Description 3/11/98 12:33
The TL-4 passive modules are available in three media versions:
TL-4/S
Module with four BNC connectors, occupying one slot.
This version is intended for use with coaxial cable. Each
station is connected over a single 93 ohm (RG-62) coax
cable. At the station side, a special DB-9/BNC (TXC)
balun must be used. A special module is available for
RG-59 (75Ω) coaxial cable.
TL-4/SD
Module with two DB-9 female connectors, occupying
one slots. This version is intended for use with shielded
twisted pair (STP) cables (150Ω characteristic
impedance), such as IBM Type 1, 2, 6 or 9 cables.
A T cable should be used at each port, for connection of
up to four workstations.
TL-4/U
Module with four RJ-45 connectors, occupying one slot.
This version is intended for use with unshielded twisted
pair (UTP) cables (100Ω characteristic impedance), such
as IBM Type 3, AT&T 1010, 1061 or Northern Telecom
BDN. Type-3 media filters, such as the RAD MF-3, must
be used at the workstation connection, if no media filter
is integrated in the Token Ring Adapter.
TL-4/SU
Module with four shielded RJ-45 connectors, occupying
one slot. This version is intended for use with screened
unshielded twisted pair cables (100Ω characteristic
impedance).
UTP, STP, coaxial and fiber-optic modules can be mixed on the same ring.
The maximum insertion loss for the TL-4 module, where all ports are
bypassed, is 0.1dB for 4MHz and 0.3dB for 16MHz. The transmit to receive
loss is 0.5dB for 4MHz and 0.8dB for 16MHz for each individual lobe, and
the loss for the back-up path of the module is 0.1dB for 4MHz and 0.2dB for
16MHz. The pinout signals originate from the DTE. Pinouts of the DB-9 and
RJ-45 connectors can be found in Tables 3.2 and 3.3.
Maximum lobe distances for the TL-4 modules can be defined for the
configuration where the RADring hub is in stand-alone configuration, or
when the TJA (Jitter Attenuator and Lobe Distance Extender) module is
installed (see Chapter 6).