Datasheet

DS21Q59 Quad E1 Transceiver
26 of 76
Register Name:
CCR7
Register Description:
Common Control Register 7
Register Address:
1F Hex
Bit: 7 6 5 4 3 2 1 0
Name: — — — — 136S ALB — TG703
NAME BIT FUNCTION
— 7
Unused. Should be set = 0 for proper operation.
— 6
Unused. Should be set = 0 for proper operation.
— 5
Unused. Should be set = 0 for proper operation.
— 4
Unused. Should be set = 0 for proper operation.
136S 3
1:1.36 Transformer Select
0 = 1:2 transmit transformer
1 = 1:1.36 or 1:1.6 transmit transformer (see table below for details)
ALB 2
Analog Loopback. Setting this bit internally connects TTIP and TRING to
RTIP and RRING. The external signal at the RTIP and RRING pins is
ignored.
— 1
Unused. Should be set = 0 for proper operation.
TG703 0
Transmit G.703. This control bit works with CCR5.5 to select G.703
functionality on the transmitter and receiver (Table 8-B
). These bits
determine whether the line receiver and transmitter should receive/
transmit a normal E1 signal (Section 6 of G.703) or a 2.048MHz
synchronization signal (Section 10 of G.703).
136S L2 L1 L0 APPLICATION
TRANSFORMER
1:1.6
TRANSFORMER
1:1.36
1 0 0 0
75W Rt = 0W
N.M.
1 0 0 1
120W Rt = 0W
N.M.
1 0 1 0
75W Rt = 2.7W Rt = 0W
1 0 1 1
120W Rt = 3.3W Rt = 0W
1 1 0 0 N.M. N.M. N.M.
1 1 0 1 N.M. N.M. N.M.
1 1 1 0 N.M. N.M. N.M.
1 1 1 1 N.M. N.M. N.M.
N.M. = Not meaningful