Specifications

RADring
Installation & Operation Manual Functional Description
3/11/98 12:33 Access Modules Functional Description 2-19
TL-4
Module with four RJ-45 connectors, occupying one slot.
This version is intended for use with unshielded twisted
pair (UTP) cables, 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. A media filter is integrated into each lobe,
to comply with RFI and impedance requirements.
TL-4/ASU
Module with four shielded RJ-45 connectors, occupying
one slot. This version is intended for use with screened
unshielded twisted pair cables.
The TL-4/A modules provide retiming and high quality regeneration of the
802.5 signal, minimizing the accumulated jitter at each lobe.
TL-4/CX
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.
UTP, STP, coaxial and fiber-optic modules can be mixed on the same ring.
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).
TL-4 Passive Access Modules
TL-4/U, TL-4/SU, TL-4/S and TL-4/SD lobe circuits are passive with regard to
the Token Ring signal. The IEEE 802.5 signal is transparently transferred to
the lobe cable if the attached station is inserted, or to the next lobe circuit if
the station is not inserted.