TL-205A-R2 BLACK BOX, TL-205A-R2 Datasheet - Page 3

• Manufacturer Part Number: TL-205A-R2
• Description: TELCO LINE BRIDGE STANDALONE
• Manufacturer: BLACK BOX

The Telco Line Bridge (TLB) is an active bridge
for use on leased lines. The unit enables users to
interface multiple analog telephone lines (four-wire
type) to one modem. The TLB circuit is designed
using operational amplifiers that are driven by 600
ohm transformers, thus maintaining proper line
impedance. The output of the op amps is also
matched to the analog line with 600 ohm
transformers.
The unit has been designed to simultaneously
broadcast any data received by the “master”
input to each of four devices connected to the
independently adjustable, transmit outputs.
Any data received by the TLB on any one of
its four independently adjustable receive inputs
is transmitted out the “master” output. Normally,
only one of these receive inputs is capable of
receiving data at any one time. If data is received
simultaneously by more than one receive input,
the data transmitted out the “master” output may
be unintelligible.
2
TELCO LINE BRIDGE (TLB)
PART NUMBER
TL205A-R2 .....................TELCO LINE BRIDGE STANDALONE UNIT (115 VAC)
TL205AE-R2...................TELCO LINE BRIDGE STANDALONE UNIT (230 VAC)
TL205-C..........................TELCO LINE BRIDGE PRINTED CIRCUIT CARD
RM013 ............................TELCO LINE BRIDGE RACK
2. Description
DESCRIPTION
A typical application for the TLB is where a
“master” modem is broadcasting data out to four
“slave” modems and only one “slave” modem is
allowed to send data back to the master modem
and each receive leg to the slave modems can be
independently set to compensate for varying line
losses and receive requirements of the devices
being used.
The TLB is available in both standalone and rack
mounted versions. The Telco Line Bridge PC Card
(TL205-C) is made to be inserted in the Telco Line
Bridge Rack (RM013). This is a 19” rack capable of
holding up to 12 printed circuit cards. The rack has
its own power supply which is switch selectable for
115 VAC or 230 VAC operation.
at a time. In this application, each transmit