TL-205A-R2 BLACK BOX, TL-205A-R2 Datasheet - Page 4

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

NOTE: Data received by the TLB on “RA” will be
1. Remove the cover from the TLB and connect
2. Set the gain/attenuation for each transmit
the leased lines and the modem to terminal
blocks TB1 and TB2 as shown in Figures 1
and 2. Cable ties have been included to
provide strain relief for each cable.
and each receive pair according to your
system requirements. When you select a Gain
for a particular leg, the gain/loss jumper for
that circuit must be in the “gain” position.
When you select a Loss for a particular leg,
the gain/loss jumper must be in the “loss”
position.
The gain/loss jumpers for the four transmit
legs (T1, T2, T3, and T4) are W6, W7, W8,
and W9. The gain/loss jumpers for the four
receive legs (R1, R2, R3, and R4) are W2, W3,
W4, and W5.
broadcast out all four transmit legs (T1
through T4) simultaneously. However,
normally only one receive leg (R1 through
R4) is capable of receiving data at any one
time. If data is received on two or more
receive legs simultaneously, the data
output at “TA” may be unintelligible.
1 2
LINE 1 LINE 2
T1
3 4
R1
TB1
5 6
T2
Figure 1. Rear View of the Telco Line Bridge
7 8 9 10
R2
TA
3. Installation
1 2
RA
3 4
LINE 3
T3
TB2
5 6
R3
7 8 9 10
LINE 4
T4
3. Once the gain/loss jumper is set, select the
4. Jumper position W1 is for tying frame ground
5. Replace the cover and connect the power
R4
correct DIP switch settings on either S1, S2,
S3, or S4 for the required gain of attenuation.
Table 1 lists the DIP switch settings and
jumper positions required for the available
gain/attenuation settings.
to logic ground. The position is normally left
open at the factory. If signal ground is to
be connected to frame ground, it is
recommended that a 100 ohm, half watt
resistor be soldered in location W1. A wire
jumper may also be used, but care must be
taken to ensure that circulating ground
currents are limited to acceptable levels.
supply to the TLB. Then connect the power
supply transformer to a wall receptacle of the
proper voltage.
INSTALLATION & OPERATION MANUAL
POWER SUPPLY
CONNECTIONS
CABLE ACCESS
HOLE
3