STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
T3 & T4
Generally 1:2.42CT Transformers
with centre taps floating (see Table
14)
50436 (single) Midcom
T1137 (dual)
TG23-1505NS
(single)
Pulse
Halo
TG23-1505N1
(dual)
Halo
Table 13
Case
- Typical Input Return Loss at Receiver
n
Rterm
Typical IRL
30.2dB
1:2.42
1:2.42
1:2.42
T1: Zo=100Ω
E1: Zo=120Ω
E1: Zo=75Ω
18.2Ω=±1%
18.2Ω=±1%
13.0Ω=±1%
24.4dB
43.3dB
Table 14
Case
- Termination Resistors, Transformer Ratios and TRL
n
Rt1
Rt2
Typical TRL
14.1dB
0dB
1:2.42
1:2.42
1:2.42
SH T1: Zo=100Ω
SH T1: Zo=100Ω
SH E1: Zo=120Ω
12.7Ω=±1%
12.7Ω=±1%
19.4dB
12.7Ω=±1%
12.7Ω=±1%
1:2.42
9.6dB
18.8dB
SH E1: Zo=75Ω
SH E1: Zo=75Ω1
12.7Ω=±1%
8.06Ω=±1%
12.7Ω=±1%
8.06Ω=±1%
1:2.421
1:2.42
1:2.42
1:2.42
1:2.42
14.1dB
14.1dB
14.1dB
14.1dB
LH T1 LBO=0dB:= Zo=100Ω
LH T1 LBO=-7.5dB: Zo=100Ω
LH T1 LBO=-15dB: Zo=100Ω
LH T1 LBO=-22.5dB:= Zo=100Ω
Notes:
12.7Ω=±1%
12.7Ω=±1%
12.7Ω=±1%
12.7Ω=±1%
12.7Ω=±1%
12.7Ω=±1%
12.7Ω=±1%
12.7Ω=±1%
1) Headroom power is about 30% higher in this case.
9.2
Clock and Data Recovery (CDRC)
The Clock and Data Recovery function is provided by the Clock and Data
Recovery (CDRC) block. The CDRC provides clock and PCM data recovery,
PROPRIETARY AND CONFIDENTIAL
35
PMC [ PMC-SIERRA, INC ]
